Product A
Lark
by ByteDance
All-in-one collaboration suite with chat, docs, calendar, and video built in.
Free tier
Visit Lark →Product B
Mattermost
by Mattermost Inc.
Self-hosted, open-source team messaging built for high-security environments.
Free tier
Visit Mattermost →Side-by-Side Comparison
| Feature | Lark | Mattermost |
|---|---|---|
| Price | FreeBetter | Free |
| Free Tier | Yes | Yes |
| Top Pros | All-in-one suite with generous free tier | Air-gap deployable for high-security environments |
| Collaborative docs and sheets built in | Fully open-source | |
| Strong mobile experience | Strong compliance certifications | |
| Top Cons | Less third-party integrations than Slack | Self-hosting demands significant IT resources |
| Data residency concerns for some enterprises | Less polished UX than Slack |
Choose Lark if you…
- Want: all-in-one suite with generous free tier
- Want: collaborative docs and sheets built in
- Want: strong mobile experience
Choose Mattermost if you…
- Want: air-gap deployable for high-security environments
- Want: fully open-source
- Want: strong compliance certifications