Your team started on a WhatsApp group. Then there were four groups, one with a former freelancer still in it, and the file someone sent in March is gone. Somebody suggests "we should get on Slack or Teams," and now you have to pick — with no budget, no IT person, and no appetite for migrating twice.
The takeaway up front: for a team under about twenty people, the decision almost never comes down to features. Every serious option handles channels, files, search, calls, and mobile. What decides it is four boring things: how much history the free plan keeps, what the price does when you outgrow free, whether clients and contractors can be let in without paying for them, and how hard it would be to get your data out. Choose for those and you will not be doing this again in eighteen months.
Why a group chat stops working around eight people
Consumer messaging apps are built around people. Work chat is built around topics. That is the whole difference, and why the switch feels necessary at a certain size even though nothing broke exactly.
In a group chat every message goes to everyone, so the only way to cut noise is another group — and groups multiply until nobody knows where a decision was made. A team chat app gives you channels: one per project, client, or subject, joined by the people it concerns and readable from the top by anyone who arrives later.
Three other things a group chat cannot do:
- Threads. Replies attach to the message they answer, so two conversations run in a channel without shredding each other.
- Search that works. Finding a file or a decision by keyword, filtered by channel, person, and date.
- Administration. Someone can add and remove members, control who sees what, and take ownership when a person leaves. A group owned by an employee's personal phone number is a real business risk.
If your problem is really task tracking rather than conversation, chat is the wrong fix — you want a to-do or task app.
The five things that actually decide it
1. Free-plan message history
The most important line in the comparison and the one people miss. Several free plans limit how far back you can see or search — Slack's free plan, for example, keeps roughly the most recent 90 days accessible. Older messages are not deleted, but you cannot read or search them without upgrading.
Whether that matters depends on what you use chat for. If every decision ends up in a document or task, a rolling window is fine. If your chat is the record — client agreements, why you chose an approach, that supplier's address — a history limit is a slow-motion problem that only shows up once the messages are behind the paywall.
2. What the price does when you grow
Team chat is priced per user, per month: fine at six people, different at twenty. Do the arithmetic for the size you expect in a year and check the step between tiers — the jump from free to the first paid tier is usually the one that stings, and it is often triggered by history or admin controls rather than a feature anyone asked for.
Check too whether chat is already bundled with something you pay for: with Microsoft 365 or Google Workspace you likely already pay for Teams or Google Chat. "Free with what we already buy" is a genuine reason.
3. Guests and external people
Most small teams work with outsiders: clients, contractors, a designer, an accountant. Check three things — can you invite someone to a single channel rather than the whole workspace, do guests count as billable users, and can you remove them cleanly when the project ends? Weight this heavily if that describes you, ignore it entirely if not.
4. Search, files, and integrations
Search quality is what makes chat useful a year in. Test it during the trial — search a phrase, filter by channel, find a file by name — rather than trusting a feature list. On integrations, be honest about which you will use: most small teams need calendar, video calls, and file storage. A long catalogue is not a benefit if you connect two things.
5. Ownership, admin, and export
The unglamorous one that matters most on the day it matters. Is the workspace owned by the business account, not a personal login? Can an admin remove a departing member and keep their messages and files? Can you export your data on your plan — some exports are paid-tier only? Check the export path before you commit, not when you are already leaving, as with any tool you put work into (choosing software you can trust).
How the main options differ
Named with the reason, not a ranking — the right one depends on the factors above.
Slack. The most polished channel-and-thread experience, the widest integration ecosystem, excellent search. Choose it when chat quality itself is the priority and you have, or expect, budget. The constraint is the free plan's history window, which is why most small teams eventually pay.
Microsoft Teams. Chat plus meetings plus deep integration with Office documents and SharePoint storage. Choose it if you already pay for Microsoft 365 Business — effectively included, with tighter document collaboration than any bolt-on. The trade-off is complexity; small teams often find it heavier than they wanted.
Google Chat. Included with Google Workspace, with Drive, Docs, and Calendar built in. Choose it if your team lives in Gmail and wants one less subscription. Lighter than Slack, which for some teams is the point.
Discord. Free, fast, with persistent voice channels people drop into — a good fit for small creative teams. Hesitate because it is built for communities rather than businesses, the admin controls are consumer-grade, and clients may find the invitation odd.
Zulip, Mattermost, Rocket.Chat. Open source and self-hostable; Zulip's topic threading suits teams across time zones who read in batches. Worth it only if you must keep data on infrastructure you control.
WhatsApp or Telegram. Where most teams start: good at fast informal messaging, poor at organizational memory, structure, and ownership. Keeping a group for urgent pings while moving real work into a channel tool is a common, reasonable arrangement.
A 30-minute trial that tells you something
Do not roll out to the whole team to evaluate it. Run this with two or three people first.
- Create the workspace on a business email address. Getting ownership right on day one saves a painful conversation later.
- Make three real channels — an actual project, an actual client, and general. Not "test".
- Move one live conversation into it for a few days. Real messages are the only useful test.
- Upload the files you actually share, then find them again by search a day later.
- Invite one external person as a guest if you work with outsiders, and check what they cost and can see.
- Try it on the phone, where most chat is read, then find the export button and check the free-tier history limit.
If two options both pass, take the cheaper one, or the one already bundled with something you pay for.
Setting it up so it doesn't become noise
The most common failure is not the wrong app; it is a right app that turns into a firehose and gets muted.
- Few channels, clearly named, on a convention like
client-nameandproject-name. Archive them when work ends. - Threads for replies. Agree this on day one; retrofitting the habit later is much harder.
- Turn off "notify for everything" by default — mentions and direct messages only, with people opting into channels they want live. A tool that follows people home at 11pm produces resentment, not responsiveness.
- Agree what chat is not. Decisions and tasks belong somewhere durable, so write down which document holds the record.
Privacy and security basics
Small teams often skip this and then have an awkward moment.
- Turn on two-factor authentication for everyone, and single sign-on if your plan supports it.
- Know where the data lives and what the retention policy is, particularly if you handle client information.
- Review guest access on a schedule, and do a joiner/leaver check quarterly. External accounts left in place are the most common quiet exposure in a small workspace, and two people should hold admin — not one.
- Do not put secrets in chat. Passwords and keys belong in a password manager — see how to choose a password manager — and check the app's phone permissions the way you would any app you install.
FAQ
Is a free team chat app good enough for a small team?
For many teams, yes. Free tiers usually cover channels, direct messages, file sharing, search, and calls. The limitation that most often forces an upgrade is message history, so the honest question is whether your chat needs to be a long-term record or just a conversation.
Slack or Microsoft Teams for a small business?
If you already pay for Microsoft 365, Teams is the pragmatic choice: bundled, with tightly integrated document collaboration. If you do not, Slack is generally the better pure chat experience with easier setup, at the cost of a separate subscription once you outgrow the free history window.
Can we just keep using WhatsApp for work?
Plenty of teams do, but note the trade: no topic-based channels, no administrative ownership, weak search, and a workspace tied to personal phone numbers. A common compromise is keeping a group for urgent pings and moving project conversation into a proper chat tool.
How do we move our conversations to a new app?
Most teams do not migrate history — they draw a line. Announce a switch date, move important reference material into documents or a pinned channel first, then start fresh and set the old group to read-only.
Pick for the exit, not the demo
Choosing team chat is less about features than about the four questions that only bite later: how much history you keep, what it costs at your next size, whether outsiders can join cleanly, and whether you could leave if you wanted to. Answer those honestly, run a short trial with real messages, and set the channel and notification habits on day one. When you are ready to see how the options stack up, compare team chat apps side by side at CNTechApp.
