Mattermost
Fewer than 5 people recommend it so far, so there's no written verdict. Here is what commenters said.
Why people recommend it
“I run Mattermost on my phone so I can talk to them and task them with things”
“Mattermost”
Caveats and dissent
“I would just stay away from Mattermost. Don't host, don't use, don't contribute.”
“That 10k limit was the breaking point for me too.”
Show 2 more
“There’s always risk of a rug pull or going the wrong direction with “open-source” software developed by a for-profit company (Plex, MinIO, Mattermost”
“HN’s favourite “underdog” alternative to mainstream software is just a worse version of the mainstream software.”
Often compared with
1 moved from Mattermost to ZulipRocket.Chat4 comments mention both
1 moved from Mattermost to Synapse
From the makers not counted in the ranking
“Mattermost (https://mattermost.com) is an open-core collaboration and workflow automation platform”
“Mattermost (https://mattermost.com) is an open-core collaboration and workflow automation platform for air-gapped, on-prem and private clouds.”
Threads where it came up
- Mattermost restricted access to old messages after 10000 limit is reached 4 mentions
- Ask HN: Who is hiring? (October 2026) 1 mention
- Ask HN: Who is hiring? (September 2026) 1 mention
- Qwen 3.6 27B is the sweet spot for local development 1 mention
- Discord will require a face scan or ID for full access next month 1 mention
- Mattermost say they will not clarify what license the project is under 1 mention
Data: mattermost.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 10
“I run Mattermost on my phone so I can talk to them and task them with things”
“I looked into hosting Rocket.chat, Zullip, and Mattermost but from what I recall voice + mobile were either missing or paywalled”
“I would just stay away from Mattermost. Don't host, don't use, don't contribute.”
“Mattermost”
“If I go with Zulip, mattermost, rocket.chat, matrix, etc I introduce maintenance overhead”
“That 10k limit was the breaking point for me too.”
“There’s always risk of a rug pull or going the wrong direction with “open-source” software developed by a for-profit company (Plex, MinIO, Mattermost”
“HN’s favourite “underdog” alternative to mainstream software is just a worse version of the mainstream software.”
“at least I didn't have to use Mattermost anymore.”
“I used to use Mattermost.”