Best Chat Apps in 2026: 8 Apps Compared for Business and Private Messaging

Key takeaways

• Signal is the strongest free choice for private messaging, because it is run by a nonprofit and every chat is end-to-end encrypted.
• Slack is still the most polished team chat, but its free plan only keeps 90 days of message history and allows 10 app integrations.
• If your business already pays for Microsoft 365 or Google Workspace, Teams or Google Chat costs you nothing extra and is usually the cheapest route.
• Telegram is not end-to-end encrypted by default. Only its "Secret Chats" are, which matters if you picked it for security.
• Threema Work ($3 per user per month) and Wire (free for up to 5 team members) are the two options built around privacy for teams.

Quick comparison

The best chat apps

"Best chat app" means two different things: a place where your team talks, or a private way to message friends and customers. We cover both, and we say which job each app does well. Prices below are the ones shown on each vendor's own site in October 2026.

1. Slack

• Best for: Teams that live in chat all day
• Starting price: Free / $7.25 per user per month (billed annually)
• Free plan: Yes
• Website: slack.com

Slack is the app most people picture when they hear "team chat." Conversations live in channels, threads keep side discussions from burying the main one, and the search is good enough that people actually use it instead of asking the same question twice.

The free plan works as a long trial more than a permanent home. Slack's pricing page says free workspaces keep 90 days of message history, allow up to 10 app integrations and limit huddles to one-to-one. Pro is $8.75 per user per month on monthly billing or $7.25 billed annually, and it removes the history and integration limits and adds group huddles. Business+ is $18 monthly or $15 annually and is where Slack puts its more advanced AI tools, such as its Slackbot assistant and AI search.

The honest catch is cost at scale. Ten people on Pro is about $870 a year at the annual rate, and that is before anything else you pay for. If you only need a quick way to talk to two or three coworkers, a free tier elsewhere may be enough.

Pros

• Very organized channels and threads
• huge app directory
• group huddles and external guests on paid plans

Cons

• Free plan keeps only 90 days of history and 10 app integrations
• the AI features sit on the pricier tiers

2. Microsoft Teams

• Best for: Small businesses on Microsoft 365
• Starting price: Free / $4 per user per month (Essentials, billed annually)
• Free plan: Yes
• Website: microsoft.com

Teams makes the most sense when your company already lives in Microsoft's tools. Chat, channels, video meetings and file sharing sit in one window, and a document shared in a chat opens in Word or Excel without leaving the thread.

Microsoft sells a standalone Teams Essentials plan at $4 per user per month, billed annually. Per Microsoft's own pages, it supports meetings of up to 30 hours with up to 300 participants and includes 10 GB of storage per user. The full Microsoft 365 Business plans include Teams along with the Office apps and more storage, and they cost more. Microsoft also offers a free version of Teams for smaller needs, though the limits change, so check the free page before relying on it.

The catch is clutter. Teams does a lot, and new users often need a short walkthrough to find their way around channels, chats and the separate calendar. Prices can change, so confirm the figure on Microsoft's site on the day you buy.

Pros

• Chat, calls and video in one app
• low-cost Essentials plan
• deep ties to Outlook, Word and Excel

Cons

• Interface has more menus than Slack
• Essentials includes only 10 GB of storage per user

3. Google Chat

• Best for: Businesses already on Google Workspace
• Starting price: $7 per user per month (Workspace Starter, billed annually)
• Free plan: Free trial (14 days)
• Website: workspace.google.com

If your company email and files already run on Google, Chat is the path of least resistance. Google lists it as included with Workspace at no extra cost, and it connects to Gmail, Calendar, Drive and Meet, so you can jump from a message to a call in a couple of clicks.

You pay for Workspace, not for Chat. The Business Starter plan is listed at $7 per user per month on an annual commitment, with Standard at $14 and Plus at $22. Google also says people without Workspace can try Chat with a 14-day trial. Gemini, Google's AI assistant, can summarize a conversation and pull out action items inside Chat.

Where it falls short is on privacy and extras. Google says Chat uses encryption, access controls and compliance certifications, but its product page does not claim end-to-end encryption, so it is not the pick for sensitive talk. Teams that want a very large catalog of add-on apps will also find Slack deeper.

Pros

• Included in every Workspace plan
• works alongside Gmail, Calendar, Drive and Meet
• spaces for team projects

Cons

• Less third-party integration choice than Slack
• Google does not describe it as end-to-end encrypted

4. Signal

• Best for: Private one-to-one and family chats
• Starting price: Free
• Free plan: Yes
• Website: signal.org

Signal is the simplest answer to "which messaging app is the most secure?" It is free, has no ads, affiliate marketing or tracking, and uses the open-source Signal Protocol so that, in its own words, nobody but you and the people you message can read the conversation.

The app is run by a nonprofit funded by grants and donations, so there is no ad business pushing it to collect your data. Signal also lets you pick an optional username, and its support pages say that your phone number stays hidden from people who do not already have it saved. For a business owner, that is useful when you do not want clients holding your personal number.

The weakness is that Signal is a personal messenger, not a workplace tool. There are no channels, roles or admin dashboards, and a business that needs oversight of who said what will outgrow it quickly. It is best for owners, partners and small groups who care about confidentiality more than workflow.

Pros

• End-to-end encryption on messages and calls
• run by a nonprofit with no ads or tracking
• optional usernames keep your number private

Cons

• No team features such as channels or admin controls
• contacts must also install it

5. WhatsApp Business

• Best for: Talking to customers on their phones
• Starting price: Free
• Free plan: Yes
• Website: whatsappbusiness.com

WhatsApp Business is a separate app from regular WhatsApp, designed for small companies that handle customer conversations from a phone. WhatsApp describes it as a free download for iOS and Android, with a catalog for showing products, labels for sorting chats and quick replies for answers you send often.

It is a good fit for local shops, salons, restaurants and service providers whose customers already use WhatsApp every day, especially if many of those customers are outside the US. A catalog lets you show prices and photos inside the chat, and quick replies save typing for hours, address and common questions. Larger companies can use WhatsApp's separate Business Platform, which WhatsApp describes as aimed at medium to large businesses and prices separately.

The honest limitations are reach and ownership. Many US customers still default to text messages, so WhatsApp helps most if your customer base already uses it. And because the app belongs to Meta, some people will pass on it for privacy reasons, even though WhatsApp messages are end-to-end encrypted.

Pros

• Customers already have WhatsApp
• catalog, labels and quick replies built in
• free to download

Cons

• Owned by Meta
• the app is aimed at one business owner or a small team, not internal staff chat

6. Telegram

• Best for: Large communities and channels
• Starting price: Free
• Free plan: Yes
• Website: telegram.org

Telegram is built for scale. Groups can hold up to 200,000 members, channels can have unlimited subscribers, and you can send files up to 2 GB. That makes it a favorite for broadcasting updates, running a community or sharing large files with a client.

The thing to understand is the encryption. Telegram's own FAQ says regular Cloud Chats are encrypted between your device and its servers and stored in its cloud, while end-to-end encryption applies only to Secret Chats, which you start manually. Secret Chats cannot be forwarded and stay on the device where they were created. If you chose Telegram because you thought everything was end-to-end encrypted, it is not.

Telegram says private messaging is free with no ads or subscription fees, and offers an optional paid Premium tier. We would use it for public-facing communities and broadcast updates, and pick Signal or Threema when the content is confidential.

Pros

• Groups of up to 200,000 members
• unlimited channel subscribers
• files up to 2 GB each

Cons

• Regular chats are not end-to-end encrypted
• Secret Chats are limited to one device

7. Threema Work

• Best for: Privacy-first company chat
• Starting price: $3 per user per month
• Free plan: Free trial (1 month, up to 30 users)
• Website: threema.com

Threema is a Swiss messenger, and Threema Work is its business edition. Its pricing page lists a Core plan at $3 per user per month and a Professional plan at $5, with custom pricing for an on-premises option. A one-month trial is offered for up to 30 users with no purchase obligation.

On privacy, Threema says its servers run only in Switzerland, that messages are deleted from the servers once delivered and that contacts and group chats are stored on users' devices. It uses end-to-end encryption with perfect forward secrecy. Admins get management tools for groups and contacts, and the app covers polls, voice and video calls, file sharing and emoji reactions.

The trade-off is network effect. Fewer people have Threema than WhatsApp or Signal, so using it with clients means asking them to install another app. It suits companies in regulated fields, such as law, health and finance, that want control over where data sits.

Pros

• End-to-end encryption with servers run in Switzerland
• messages deleted from servers once delivered
• polls, calls and file sharing included

Cons

• Smaller user base, so clients may need to install it
• desktop and web experience is plainer than Slack

8. Wire

• Best for: Secure team chat and calls
• Starting price: Free / EUR 7.45 per user per month (billed annually)
• Free plan: Yes
• Website: wire.com

Wire is a secure collaboration app aimed at teams that need encrypted chat, calls and file sharing. Its pricing page describes a Free plan for teams of up to 5 people, an SMB plan for up to 100 people at EUR 7.45 per person per month on annual payment (EUR 8.94 monthly), and custom Enterprise pricing.

The SMB tier adds video conferences for up to 150 participants, single sign-on, admin controls and guest roles. Wire lists real multi-device end-to-end encryption, perfect forward secrecy and encrypted history backup, and offers cloud, on-premises or hybrid deployment, which is the reason government and large organizations look at it.

For a small US business, the main friction is price and size. Euro pricing means the dollar cost shifts with the exchange rate, and the free plan is capped at five people with no conference calls beyond two participants. Wire is a better fit than Signal if you need team accounts and admin controls but still want strong encryption.

Pros

• Free tier for teams of up to 5
• end-to-end encryption on multiple devices
• on-premises option for large organizations

Cons

• Prices are listed in euros
• free tier lacks group conference calls with more than 2 people

How we picked these

We compared each app using its official pricing page, feature pages, support documentation and app store listings, all checked in October 2026. We did not run our own long-term hands-on trials, so we describe what the vendors publish rather than claim personal experience. When a figure could not be confirmed on the vendor's own site, we left it out or pointed you to the website.

We included well-known team tools (Slack, Teams, Google Chat), privacy-focused options (Signal, Threema, Wire) and apps that work well for customer or community messaging (WhatsApp Business, Telegram). We looked for a real free option or a clear starting price, a plain statement about encryption and ownership, and at least one limit you should know about before you commit.

How to choose a chat app for your business

Start with who needs to talk to whom. If it is your own staff, a team chat tool like Slack, Teams or Google Chat gives you channels, search and file sharing. If it is customers, you want the app they already use, which in the US usually means regular text messages, and in many other countries means WhatsApp.

Check what "secure" actually means

Look for the words "end-to-end encrypted by default." Signal, Threema and Wire say so for their chats. Telegram applies it only to Secret Chats. Slack, Teams and Google Chat encrypt data in transit and at rest, which protects against outsiders but not against the vendor, and they give administrators compliance tools that end-to-end apps often cannot offer. If your industry needs to keep records, that can be a feature rather than a flaw.

Count the real cost

Per-user pricing grows fast. Multiply the price by your headcount and by 12, and compare it with what you already pay for email and office software. A bundle you already own is often cheaper than a new subscription.

Think about leaving

Ask whether you can export your messages before you commit a team to any app. Slack's free plan hides history older than 90 days, so check who owns the workspace and how data comes out.

Frequently asked questions

What is the best messaging app for privacy?

Signal is the one we point most people to. It is a nonprofit, has no ads, and encrypts messages and calls end to end by default. Threema is a strong alternative if you want Swiss-hosted servers and a business plan.

What is the best business messaging app for a small team?

For most small teams, it is the one your company email already includes: Microsoft Teams if you use Microsoft 365, Google Chat if you use Google Workspace. If you are not tied to either, Slack's free plan is a good place to start, as long as you can live with 90 days of history.

Is there a good free chat app?

Yes. Signal, Telegram and WhatsApp Business are all free to download and use. Slack and Wire both have free plans with limits, and Microsoft offers a free version of Teams. Free plans for team tools usually cap history, integrations or team size.

Is Telegram a secure messaging app?

It is partly secure. Telegram says all messages are encrypted, but regular chats use server-client encryption and are stored in its cloud. End-to-end encryption is available only in Secret Chats, which you must start yourself.

Can I use WhatsApp for my business?

Yes, through the free WhatsApp Business app, which adds a catalog, labels and quick replies. Larger companies use the separately priced Business Platform. It works best when your customers already use WhatsApp.

Sources

1. https://slack.com/pricing
2. https://www.microsoft.com/en-us/microsoft-teams/compare-microsoft-teams-business-options
3. https://www.microsoft.com/en-us/microsoft-teams/free
4. https://workspace.google.com/pricing
5. https://workspace.google.com/products/chat/
6. https://signal.org/
7. https://support.signal.org/hc/en-us/articles/6712070553754-Phone-Number-Privacy-and-Usernames
8. https://whatsappbusiness.com/
9. https://whatsappbusiness.com/products/business-app-features/
10. https://telegram.org/faq
11. https://threema.com/en/work
12. https://threema.com/en/work/pricing
13. https://wire.com/en/pricing