Lark is the most ambitious of these - chat bundled with docs, calendar and a suite. Chanty and Pumble compete mainly on price, including free tiers with fewer history limits than Slack's.
- ›Where the money actually goes
- ›What switching costs
- ›The question that decides it
- ›Where Brainis fits
Where the money actually goes
Chat is priced per user per month, so cost scales with headcount. That is why the alternatives look attractive: the same core function at a lower per-seat number.
But per-seat is only half of it. The other half is message retention, which is the real pricing lever. Free and cheap tiers cap searchable history. Once your searchable history is shorter than your sales cycle or your project length, the archive stops answering questions, which was the reason to keep one.
Compare retention limits, not headline per-seat prices.
What switching costs
History. Exports are rarely importable in a usable form. Most teams archive and start fresh, which means a year of context becomes a zip file nobody opens.
Integrations. Slack's ecosystem is the real lock-in. Count what you would lose before you count what you would save.
Habit. Chat is the most habitual tool in the stack. A switch costs weeks of friction even when the destination is good.
The question that decides it
Not "which chat is cheapest" but "where should this conversation live?"
Operational discussion - about a deal, a candidate, a project - loses most of its value when it sits away from the record it concerns. Six weeks later the decision is unfindable, and the record never learned about it.
Social and ambient chat has no such problem and can live anywhere.
Where Brainis fits
Communication OS covers channels, direct messages, threads and announcements on the same data layer as Work, Revenue, People and Finance, so a message can reference a deal or a candidate as an object rather than a pasted link. Included on every plan from $29 a month, with no per-seat charge - so chat cost stops scaling with hiring.
The honest gaps: no huddles, no Slack-Connect equivalent for external organisations, and a much smaller app ecosystem than Slack or Lark. Many teams should connect Slack rather than replace it. See the Slack alternative case.
Tip: Whatever you choose, do not run two tools for the same conversations. Split history is worse than either tool alone.
FAQ
Is Lark's bundle worth it?
If you want docs, calendar and chat from one vendor and have no strong existing commitments, it is a genuine option.
What about free tiers?
Check the retention cap first. A free tier that forgets last quarter is a trial, not a plan.
Can we keep Slack and connect it?
Yes - notifications, approvals and permission-aware answers in-channel. See AI in Slack.
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