Mattermost alternatives
TL;DR: 12 companies doing similar work to Mattermost in B2B, ranked by how closely they match what Mattermost actually does — not just by category.
How this list was built: every company here is Y Combinator-backed and shares at least one category with Mattermost. They are scored on how closely their own description overlaps with Mattermost's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Mattermost?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Snapboard | — | Winter 2020 | 2 | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Thinkature | — | Summer 2006 | — | Inactive |
| Acunote | — | Winter 2011 | — | Active |
| ZumoDrive | Media in the cloud | Summer 2007 | 15 | Acquired |
| Fithub | — | Winter 2010 | — | Inactive |
| Post.fm | New email inbox. | Summer 2010 | — | Inactive |
| Fibo | SaaS calendar and messaging for SMBs | Winter 2017 | 15 | Inactive |
| 100x | Create, Share, and Monetize AI Agents | Summer 2022 | 3 | Active |
| Team Apart | — | Summer 2008 | 2 | Inactive |
| ZeroMailer | Easy mailing lists | Summer 2012 | 2 | Acquired |
| Retool | Build internal tools fast. | Winter 2017 | 300 | Active |
Is Mattermost still active?
Mattermost is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Mattermost. They are then ranked on how closely their own description overlaps with Mattermost's, so the closest matches come first rather than whoever happens to share a tag.