Best Chat Apps for Business in 2026: UK Pricing, Security and How to Choose

Last verified: August 2026. All prices are UK list prices in pounds sterling, excluding VAT, on annual billing unless stated otherwise. UK businesses pay 20% VAT on top, which is reclaimable if you are VAT registered. Vendors change pricing often, so confirm on the official page before you buy.

Quick answer: the best chat apps for business in the UK

• Best overall: Slack, from £5.75 per user a month, because it has the deepest integration ecosystem and the strongest AI layer of any standalone chat tool.
• Best if you already pay for Microsoft 365: Microsoft Teams, included with your existing licence, or £3.10 per user a month standalone.
• Best if you already pay for Google Workspace: Google Chat, included from £5.90 per user a month.
• Best free option: Pumble, which keeps unlimited users and unlimited message history on its free tier.
• Best for regulated firms and data sovereignty: Mattermost, self hosted or private cloud, around £8 per user a month.
• Best genuinely secure messenger for business: Threema Work, roughly £2.40 per user a month, Swiss hosted with central user management.
• Best for frontline and deskless teams: Connecteam, free for up to 10 users.

The honest answer for most UK companies is simpler than the market makes it look. If your business already runs on Microsoft 365 or Google Workspace, you have already bought a competent business chat app and should try it before spending anything else. Everyone else should start with Slack or Pumble. Firms handling genuinely confidential material should read the secure messaging section further down, because the answer there is different and the compliance stakes are higher.

Comparison table: best business chat apps at a glance

Where a vendor publishes only in US dollars, the sterling figure above is a conversion and will move with the exchange rate. Slack, Microsoft and Google all publish genuine UK list prices, so those figures are exact.

How these business chat apps were assessed

Every tool below was judged against the same six criteria, in this order of weight:

1. Total cost at realistic headcounts, including the hidden charges that only appear on the invoice, such as guest seats, VAT and AI add ons.
2. Message history and search, because a chat app that forgets is a chat app that quietly destroys institutional knowledge and your disclosure position.
3. Admin, security and compliance controls, including single sign on, retention policies, UK or EU data residency and export.
4. Integration depth, meaning whether your CRM, ticketing system and code repository can actually post into channels.
5. Mobile and offline reliability, which matters far more for frontline teams than any feature list suggests.
6. AI capability in 2026, since summarisation, enterprise search and agent workflows are now the main axis of competition.

Prices were checked against vendor UK pricing pages and independent pricing trackers in late July and early August 2026.

What changed for UK buyers during 2026

Microsoft raised prices on 1 July 2026. Microsoft 365 Business Basic went from £4.60 to £5.40 per user a month, and Business Standard from £9.60 to £10.80. Business Premium held at £16.90 and Office 365 E1 held at £7.70. Standalone Teams licences were excluded from the increase entirely. Existing customers keep their old rate until their next renewal, which for many UK businesses lands sometime in 2027, so the increase reaches different firms at different times. Monthly commitment pricing runs roughly 20% above the annual rate.

AI stopped being an add on and became a pricing lever. Slack made Slackbot a full agent, generally available from 13 January 2026 to Business+ and Enterprise+ customers, then announced more than 30 further capabilities at the end of March, including meeting notes across any video provider, reusable AI Skills and task execution through the Model Context Protocol. Google folded Gemini into Workspace base plans. Microsoft went the other way and launched permanent bundles from 1 July 2026, with the standalone Microsoft 365 Copilot Business add on sitting at a promotional £13.80 per user a month against a list price of £16.10, for organisations up to 300 seats through 31 December 2026.

The regulator sharpened its focus on unmonitored chat. The FCA published its multi firm review of off channel communications in August 2025 and has spent 2026 treating those findings as baseline supervisory expectations rather than guidance. More on that below.

The 12 best chat apps for business, reviewed

1. Slack: best overall business chat app

Slack remains the benchmark. Channels, threads, huddles and Slack Connect for working with outside organisations are all more refined than the alternatives, and the app directory carries more than 2,600 ready made integrations.

UK pricing: Free (£0), Pro at £5.75 per user a month on annual billing, Business+ at £12 per user a month on annual billing, and Enterprise+ on a custom quote. Enterprise+ is the tier previously branded Enterprise Grid.

What you get where: The free plan gives 90 days of accessible history, 10 app integrations and one to one huddles only. Pro removes the history and integration caps and adds group huddles, Slack Connect and basic AI summaries. Business+ is the compliance tier, adding SAML single sign on, SCIM provisioning, data residency options, data loss prevention, legal holds, the Discovery API and the Slackbot agent.

Watch out for: Slack bills active members, and a multi channel guest costs the same as a full employee. UK agencies with lots of client guests routinely underestimate this. Data residency is a Business+ feature, so if a client contract specifies UK or EU storage, Pro will not satisfy it.

Choose Slack if your stack is not owned by a single vendor, you depend on integrations, and you want the most capable AI assistant currently shipping inside a chat tool.

2. Microsoft Teams: best value if you already pay Microsoft

For anyone already licensed for Microsoft 365, Teams costs nothing extra and is very hard to argue against on economics alone.

UK pricing (ex VAT, annual commitment): Free plan with 60 minute group meetings and 100 participants. Teams Essentials at £3.10 per user a month, which is the only standalone paid tier. Microsoft 365 Business Basic at £5.40, Business Standard at £10.80 and Business Premium at £16.90. At enterprise scale, Microsoft 365 E3 is £33.50 and E5 is £51.60. Frontline plans sit at £2.30 for F1 and £7.70 for F3.

Strengths: Co authoring Word, Excel and PowerPoint files inside a chat, Outlook calendar integration, meeting recordings with transcripts stored in OneDrive, and enterprise grade identity and device management through Entra and Intune. Teams gained in meeting Copilot toggles during 2026, so organisers can switch AI off when a discussion turns sensitive, which matters for privileged or HR conversations.

Watch out for: The bill grows fast when you add voice. A full phone system means either E5 or stacking Teams Phone and a UK calling plan on top of your base licence, typically another £8 to £12 per user a month. Business Premium is now the standout value in the range because it did not increase while Standard did, narrowing the gap to about £6 per user a month for a tier that adds Intune and Defender for Business.

Choose Teams if you are standardised on Microsoft 365, need meetings and chat governed under one identity system, or have compliance requirements that already live in Purview.

3. Google Chat: best value if you already pay Google

Google Chat is no longer the afterthought it was five years ago. Spaces, threaded conversations, inline Drive previews and Gemini assistance make it a credible daily driver for Workspace customers.

UK pricing (ex VAT): Included with Google Workspace. Business Starter is £5.90 per user a month on an annual commitment or £7.00 on flexible monthly billing. Business Standard is £11.80 annually or £14.00 flexible. Business Plus is £18.40 annually or £22.00 flexible. Enterprise Standard starts around £22.60 annually. Business tiers cap at 300 users.

Strengths: Gemini is bundled rather than sold separately, which makes Google the cheaper route to AI assistance than the equivalent Microsoft configuration once Copilot licences are counted. Storage is pooled: 30 GB per user on Starter, 2 TB on Standard, 5 TB on Plus.

Watch out for: Starter gives only limited Gemini access, mainly in Gmail, so Standard is the realistic floor if AI matters to you. Starter also has no meeting recording. Google Chat's integration library is far thinner than Slack's.

Choose Google Chat if Gmail, Drive and Meet are already your working environment and you would rather not administer a second vendor.

4. Zoom Team Chat: best when meetings drive the day

Zoom Team Chat is bundled into Zoom Workplace alongside Meetings, Mail and Calendar, and it is available even on the free Basic plan. For companies whose culture is built around calls rather than written channels, that is a reasonable place to consolidate.

Pricing: Free with Zoom Basic. Zoom publishes headline pricing in US dollars, with Workplace Pro around $14 per user a month on annual billing and Business around $18, which converts to roughly £11 and £14. Zoom repriced during 2026, so check the figure shown at UK checkout.

Strengths: Moving from a message to a call takes one click, AI Companion handles summaries and recaps at no extra cost, and the free tier is unusually generous for chat.

Watch out for: Channel organisation and search are weaker than Slack, and Zoom Phone, Webinars and Rooms are all separately priced.

Choose Zoom Team Chat if you already pay for Zoom licences and want to retire a second messaging subscription.

5. Pumble: best free business chat app

Pumble, from the CAKE.com family that also makes Clockify, is the most generous free option in this category. Unlimited users and unlimited searchable history on a free plan is genuinely rare.

Pricing: Free plan with unlimited users, unlimited message history and 10 GB workspace storage. Paid tiers are priced in US dollars at $2.49, $3.99 and $6.99 per user a month on annual billing, which is roughly £2, £3.20 and £5.60. A seven day trial covers the paid features.

Strengths: Very low cost per seat, guest access and user groups on the middle tier, single sign on and retention policies on the top tier, and a Slack import path.

Watch out for: Around ten integrations rather than thousands. If your workflow depends on custom apps posting into channels, this will constrain you.

Choose Pumble if budget is the binding constraint and your team needs conversation and history far more than automation.

6. Zoho Cliq: best for teams already inside Zoho

Cliq is the messaging layer of the wider Zoho suite, and it is priced accordingly, from around $2 per user a month with a capable free tier underneath. Zoho operates UK and EU data centres, which helps with residency questions.

Strengths: Native ties to Zoho CRM, Desk, Projects and People, a useful bot and command framework, and both cloud and on premise deployment.

Watch out for: The experience is best inside the Zoho ecosystem. Outside it, integration breadth is average.

Choose Zoho Cliq if you run Zoho One or Zoho CRM and want messaging that reads your business data without middleware.

7. Chanty: best for micro teams that want tasks in the chat

Chanty pairs messaging with centralised Kanban boards, so a message can become a tracked task without a second subscription. Free for up to five users with unlimited searchable history, then around $3 per user a month on annual billing.

Watch out for: The five user ceiling on free is a hard stop, and the integration list is short.

Choose Chanty if you are a small agency or startup that wants light task tracking baked into conversation.

8. Mattermost: best self hosted option for regulated environments

Mattermost is the default choice when messages legally cannot leave your infrastructure. It is widely used across defence, government and financial services for exactly that reason, which makes it a common answer for UK firms with data residency clauses in client contracts.

Pricing: A free Starter or Entry edition exists for self hosted evaluation, though it is explicitly limited use rather than a production tier. Professional is $10 per user a month billed annually, around £8, paid upfront for the year. Enterprise and the newer Enterprise Advanced tier are quoted by sales.

Strengths: SAML, OpenID Connect and OAuth single sign on, AD and LDAP sync, MFA, guest accounts, compliance exports, high availability clustering and playbooks for incident response. Enterprise Advanced adds multi domain federation for air gapped deployments.

Watch out for: The old perpetual free Team Edition is gone. Any serious production deployment now needs a paid licence, and you carry the hosting, patching and upgrade burden yourself.

Choose Mattermost if data sovereignty, air gapping or DevSecOps workflows are hard requirements rather than preferences.

9. Rocket.Chat: best open source option that also handles customers

Rocket.Chat does double duty. It runs internal team chat and customer facing omnichannel conversations from the same self hosted deployment, and it federates over Matrix so you can talk to external organisations without inviting them into your workspace.

Pricing: Starter is free for up to 50 users. Pro is around $8 per user a month billed annually, roughly £6.40. Enterprise is quoted.

Strengths: Attribute based access control reached production readiness in Rocket.Chat 8.0, self hosted AI options exist for organisations that will not send data to a vendor, and the MIT licensed community edition remains genuinely open.

Watch out for: A heavier operational footprint than Mattermost, and a history of tightening the free tier.

Choose Rocket.Chat if you want one self hosted platform for both internal messaging and customer conversations.

10. Element: best for federated, end to end encrypted collaboration

Element is the flagship client for Matrix, the open protocol behind a growing number of European government deployments. Encryption is on by default and federation means two organisations can collaborate without either surrendering control of its data.

Pricing: The software is free and open source if you self host. Element Business starts at roughly $5 per monthly active user, around £4, with Enterprise, air gapped and cross domain gateway options quoted by sales.

Watch out for: Usability and threading still lag the commercial products, and video calling relies on integrated conferencing rather than a native stack.

Choose Element if encryption and decentralisation are the requirement and you have technical staff to support it.

11. RingCentral RingEX: best chat plus phone system in one app

RingEX merges team messaging with a full cloud phone system, so a channel discussion, an internal video call and an outbound customer call all happen in one place.

Pricing: RingCentral quotes UK plans separately from its US list, and the published US tiers of $20, $25 and $35 per user a month include unlimited US and Canada calling that does not apply to a UK buyer. Ask for a UK quote rather than converting the dollar figure. There is no free plan, but there is a 14 day trial.

Watch out for: The entry tier caps SMS tightly and omits automatic call recording and CRM integrations, so most teams that text customers land a tier higher. AI Receptionist and the RingCX contact centre are priced separately.

Choose RingEX if replacing your phone system is part of the same project as replacing your chat app.

12. Connecteam: best for frontline and deskless teams

Office chat tools assume everyone has a laptop. Connecteam assumes the opposite, and it is built mobile first for shift workers in construction, retail, hospitality, healthcare and field services. More than 36,000 companies use it.

Pricing: A free Small Business plan covers up to 10 users. Paid hubs start at $29 a month on annual billing for the first 30 users, roughly £23, with higher tiers above that and a small per user fee beyond 30 people. Pricing is split across three hubs: Operations, Communications and HR.

Strengths: Read receipts on announcements, admin control over who can start chats, scheduling of messages to working hours only, and blocking media from saving to personal devices.

Watch out for: Most businesses need two or three hubs, so budget for the combined figure rather than the headline one.

Choose Connecteam if your workforce is hourly, mobile and does not have corporate email addresses.

Secure and encrypted chat apps for confidential work

This is where most buying guides go wrong. They treat "secure" as one property. It is two, and they pull against each other.

Confidentiality asks whether anyone outside the conversation can read it. End to end encryption answers this.

Governance asks whether your organisation can prove what was said, control who has access, remove a leaver's access and produce records when a regulator, a court or an insurer asks. Admin consoles, retention policies and export answer this.

Consumer grade encrypted messengers are excellent at the first and deliberately terrible at the second. That is a design choice, not a defect, but it makes them the wrong system of record for a business. The right answer for most UK firms handling confidential material is a two tier setup: a mainstream chat app as the governed system of record, plus a properly administered encrypted tool for the small number of conversations that genuinely need it.

Signal: the gold standard for confidentiality, not a business platform

Signal is run by a non profit, is open source, and offers the strongest confidentiality guarantees in mainstream use. It minimises metadata, stores content on devices rather than servers, and its transparency reports show how little it can hand over under legal process.

What it does not have is any of the governance layer. There is no admin console, no SAML single sign on, no SCIM provisioning, no retention policy, no compliance export and only minimal integration with device management, endpoint detection or SIEM tooling. Identity assurance is user managed through safety number verification, which is fine for two people who know each other and no substitute for centrally enforced identity in a regulated firm.

There is also a live threat picture. The NCSC issued a warning in March 2026, updated in July 2026, that state linked actors are actively targeting Signal and WhatsApp accounts through social engineering and malicious device linking, with follow up attacks that pivot from mobile chat to malicious installers on desktop. Encryption protects the tunnel. It does not protect you from what someone sends through it.

Verdict: brilliant for a specific confidential conversation between named individuals, and a sensible out of band channel if your main systems go down. Not a platform to run a business on, and not defensible as your only record of client communications.

Threema Work: the most practical secure messenger for most businesses

Threema is Swiss, hosted in Switzerland, GDPR aligned, and unusual in that it needs no phone number or email address. Users are anonymous IDs, so the contact graph itself is not exposed. Threema Work adds the governance layer that Signal lacks: central user management, a management cockpit, MDM style app configuration, and Threema Broadcast for one to many announcements.

Pricing: Core is 3.00 per user a month on annual payment, roughly £2.40. Professional is 5.00 per user a month, roughly £4, and adds Broadcast, API access, automation and premium support with no cap on employee numbers. Threema OnPrem, for full self hosting and white labelling, is quoted. Pricing is published in Swiss francs, euros and dollars depending on region, so confirm your sterling figure at checkout. There is a 30 day free trial for up to 30 users.

Reference customers include Mercedes-Benz Group, EDEKA, the City of Frankfurt, the Bavarian State Ministry of Justice and TK Elevator, which tells you where it fits: large organisations replacing WhatsApp shadow IT with something they can actually administer.

Verdict: the best balance of real encryption and real manageability at a price a small UK firm can absorb. The obvious upgrade path from a team currently running on WhatsApp.

Wire: the choice when the buyer is a government or critical infrastructure

Wire was built by Skype's founders and is used by most G7 governments. It is fully open source from protocol to application, and it drove the standardisation of Messaging Layer Security, the newer encryption protocol designed for large groups. It carries SOC 2 Type II and ISO 27001, supports SAML single sign on, SCIM, role based access control, federation between organisations, guest access and on premises deployment.

Pricing: around €7.45 per seat a month billed annually, roughly £6.30, for teams up to 100 people. Above that, pricing is quoted.

Verdict: the strongest combination of encryption and enterprise administration on this list, and priced like it. Right for defence suppliers, critical national infrastructure, legal teams handling privileged material and anyone whose clients audit their communications stack.

Element: encrypted collaboration you can host yourself

Covered above as a general chat app, but it belongs in this section too. Because Matrix federates, two organisations can collaborate in a shared encrypted room while each keeps its own server and its own data. Element supports air gapped and cross domain deployments for classified environments, which is why it appears across European public sector estates.

Verdict: choose Element over Wire when federation and self hosting matter more than polish, and when you have the engineering capacity to run it.

Worth knowing about, rarely right for business

Session removes phone numbers entirely and routes messages through a decentralised onion network. Briar works over Bluetooth and Wi Fi Direct with no internet at all. Both are built for activists, journalists and communications blackouts rather than commerce, and neither offers business administration. BlackBerry SecuSUITE sits at the government grade end for organisations with national security requirements and budgets to match.

Secure messaging options compared

Note the split down the middle of that table. The top four give you stronger confidentiality. The bottom two give you deeper governance and a real audit trail. Very few organisations get both from one product, which is why the two tier approach usually wins.

The UK compliance trap most firms walk into

Encryption can create legal exposure as easily as it removes it. Three UK specific points deserve attention.

FCA recordkeeping applies to the channel, not the app. SYSC 10A of the FCA Handbook, the UK implementation of the MiFID II taping regime, requires firms carrying out relevant regulated activities to record electronic communications regardless of which platform they happen on. In August 2025 the FCA published a review of off channel communications at eleven wholesale banks and found 178 breaches of WhatsApp and Signal policies in twelve months, 131 of them concentrated in just three firms, and 41% involving directors or senior managers. The FCA has said it will not ban specific apps and has not yet fined a UK firm for this, but it has confirmed those findings now represent baseline supervisory expectations. From September 2026 the picture widens further, as the FCA's non financial misconduct rules bring bullying and harassment into scope including where it happens outside monitored channels.

Disappearing messages can look like destroying evidence. A retention setting that deletes after seven days is a privacy feature until litigation starts, at which point it becomes a question about spoliation and your disclosure obligations. Set retention deliberately, document why, and be able to suspend it under legal hold. A message on a director's personal device is still potentially disclosable.

UK GDPR does not stop at the app boundary. You need a data processing agreement with the provider, a defensible answer on where data sits, and the ability to notify the ICO within 72 hours of a reportable breach. If you cannot see what happened inside a tool, you cannot assess or report a breach in it.

The NCSC publishes specific guidance on choosing an enterprise instant messaging solution, and its questions are the right ones: does it offer end to end encryption and enterprise single sign on, has the app or its protocols been independently assessed, what is its history of security issues, what data loss prevention features exist, and how does it integrate with device management. Worth adding one more from the NCSC's post quantum roadmap: organisations are expected to identify vulnerable systems and build a migration plan by 2028, carry out high priority upgrades between 2028 and 2031, and complete the transition by 2035. Ask any vendor you are signing a multi year deal with where they sit on that.

How to choose the right business chat app

Work through these questions in order and the shortlist usually collapses to one or two options.

1. What do you already pay for? If you have Microsoft 365 or Google Workspace, the marginal cost of Teams or Google Chat is zero. Prove it does not work before paying for a third tool.

2. Where does your data have to live? If a client contract or regulator specifies UK or EU storage, check which tier unlocks data residency. On Slack that is Business+, not Pro. If the answer involves an air gap or your own data centre, you are choosing between Mattermost, Rocket.Chat, Element and Threema OnPrem.

3. How many people are actually deskbound? If most of your workforce is on shift, a laptop first tool will fail at adoption no matter how good it is. Look at Connecteam.

4. How much does history matter? Losing 90 days of decisions is survivable for a five person startup and serious for a professional services firm with client obligations. This one factor rules out Slack Free for a lot of businesses.

5. What has to talk to what? List the five systems that must post into channels. If your CRM, ticketing tool and CI pipeline are all on that list, Slack usually wins.

6. Do you have conversations that need real encryption? If yes, plan the second tier now rather than discovering later that half your leadership team has quietly moved to WhatsApp.

7. Who administers it? Self hosting saves per seat cost and buys sovereignty, but you pay for it in engineering time, patching and upgrade cycles. Count that honestly.

What business chat actually costs a UK team

Annual spend at 25 seats, ex VAT, on annual billing:

• Pumble paid tier: around £600
• Microsoft Teams Essentials: £930
• Threema Work Core: around £720
• Google Workspace Business Starter: £1,770
• Slack Pro: £1,725
• Microsoft 365 Business Basic: £1,620
• Microsoft 365 Business Standard: £3,240
• Slack Business+: £3,600
• Google Workspace Business Standard: £3,540
• Microsoft 365 Business Premium: £5,070
• Wire: around £1,890

Add 20% VAT to every figure for the amount that actually leaves the bank account. The three costs that most often break a budget are guest seats billed at full rate, AI add ons priced per user across your entire organisation rather than per user who uses them, and phone or webinar modules bolted onto a base subscription.

Security and compliance checklist

Confirm the platform supports the following at the tier you are actually buying, not the tier in the marketing table:

• Single sign on through SAML or OpenID Connect, and SCIM provisioning for automatic offboarding
• Configurable message and file retention, plus the ability to apply and lift a legal hold
• Data residency in the UK or EU if your contracts require it
• Encryption in transit and at rest, and end to end encryption for genuinely sensitive material
• Audit logs and compliance export for disclosure and eDiscovery
• Guest and external collaboration controls with expiry dates
• Mobile device policies, including blocking downloads to personal devices
• A signed data processing agreement and a documented breach notification route

Single sign on sits behind Business+ on Slack and behind the top tier on Pumble and Mattermost. It is the single most common reason a company's real cost lands a tier above what it planned.

Migration advice that saves pain later

• Export first, decide second. Confirm the export format of your current tool before you commit to a new one.
• Do not migrate everything. Archive old channels rather than importing them. Most of that history is never read again.
• Set channel naming conventions on day one. Retrofitting them across 300 channels is far harder than agreeing them across 12.
• Run both tools for two weeks, then hard cut. Long parallel periods split conversations and kill adoption.
• Write the policy before the rollout. Which app is approved for what, what gets retained and for how long, and what happens when someone uses WhatsApp anyway. The FCA review found the gap is almost never in the policy document. It is in whether anyone follows it.

Frequently asked questions

What is the best chat app for business in the UK?

Slack is the strongest standalone business chat app in 2026 on integrations, search and AI capability, at £5.75 per user a month on the Pro plan. That said, UK companies already paying for Microsoft 365 or Google Workspace usually get better value from Microsoft Teams or Google Chat, since both are included at no extra cost.

How much does Microsoft Teams cost in the UK?

Teams Essentials is £3.10 per user a month, excluding VAT, paid yearly. Teams is also included in Microsoft 365 Business Basic at £5.40, Business Standard at £10.80 and Business Premium at £16.90 per user a month. Basic and Standard rose on 1 July 2026, while Premium and Office 365 E1 held flat. Existing customers move to the new rates at their next renewal.

What is the best free business chat app?

Pumble, because its free plan keeps unlimited users and unlimited searchable message history. Slack's free tier hides messages older than 90 days and caps you at 10 integrations, and Chanty's free tier stops at five users. Microsoft Teams and Zoom Team Chat also have usable free plans if you can live with their meeting limits.

Is Signal safe to use for business communication?

Signal offers the strongest confidentiality of any mainstream messenger, but it is not built for organisations. It has no admin console, no single sign on, no user provisioning, no retention policy and no compliance export, so you cannot control access, offboard a leaver cleanly or produce records for a regulator. The NCSC also warned in 2026 that Signal and WhatsApp accounts are being actively targeted by state linked actors. Use Signal for specific confidential conversations, not as your system of record. Threema Work or Wire give you comparable encryption with the administration a business needs.

Can UK financial services firms use WhatsApp or Signal for work?

Only within a controlled and recorded framework. SYSC 10A requires firms conducting relevant regulated activities to record electronic communications whichever channel they use. The FCA's August 2025 review of eleven wholesale banks identified 178 breaches of WhatsApp and Signal policies in a year, with 41% involving directors or senior managers, and the regulator has confirmed those findings are now baseline supervisory expectations. The FCA has not banned specific apps, but an unmonitored channel used for regulated business is a recordkeeping failure regardless of how well encrypted it is.

Which chat apps keep data in the UK or EU?

Slack offers data residency from Business+ upward. Microsoft 365 and Google Workspace both offer EU and UK data location options depending on tier. Threema hosts in Switzerland. Mattermost, Rocket.Chat, Element and Threema OnPrem can all be self hosted anywhere you choose, which is the only way to get an absolute guarantee.

How much should a small UK business budget for team chat?

A ten person company should expect to spend between £0 and £70 a month, ex VAT. Pumble's paid tier costs about £20 a month for ten seats, Teams Essentials £31, Slack Pro £57.50 and Google Workspace Business Starter £59. Add roughly 30% if you need single sign on and retention policies, since those usually sit one tier higher, and remember VAT on top.

Do I need an AI feature in my chat app?

Only if your team's problem is finding information rather than sending it. AI summarisation and enterprise search earn their cost in organisations with hundreds of channels and years of history. In a 15 person company, a well organised search box does most of the same work for nothing.

The verdict

The best business chat apps in 2026 are not separated by features any more. Channels, threads, search, huddles and file sharing are table stakes everywhere on this list. They are separated by four things: what you already pay for, where your data is allowed to live, whether the people using it sit at a desk, and whether anything you discuss would embarrass you in a regulator's file.

Answer those honestly and the decision makes itself. Microsoft 365 customers should use Teams. Google Workspace customers should use Google Chat. Everyone else should start on Slack if integrations matter and Pumble if budget matters. Regulated and sovereignty bound organisations should look at Mattermost first. Firms with genuinely confidential conversations should add Threema Work or Wire as a governed second tier rather than letting WhatsApp fill the gap. Frontline businesses should look at Connecteam and ignore the rest.

Run a two week pilot with a real project inside it before you commit to an annual contract. Every tool here demos well. Only some of them survive a busy Tuesday.