Top all-time · #577
Mattermost Blog
Company blog · mattermost.com/blogprogrammingsecurity
Mattermost Blog is the company blog at mattermost.com, writing about programming and security. Since 2016, 104 different Hacker News readers have linked it 221 times, most often “Mattermost: Open Source, Private Cloud Slack Alternative”. It is still writing: the last post was on 2026-10-26, and you can follow it by feed.
Zero-trust collaboration, automation and AI in private cloud, self-hosted, and air-gapped environments. Built for national security, critical infrastructure, and regulated enterprises.
Most-linked posts?
- Mattermost: Open Source, Private Cloud Slack Alternative41 people · 47 mentions · first linked 2016-11-02
- /10 people · 11 mentions · first linked 2018-06-26
- /careers/4 people · 10 mentions · first linked 2019-12-18
- YC leads $50M Series B in Mattermost as open source Slack alternative3 people · 3 mentions · first linked 2019-06-19
- Mattermost v7.0 is now available3 people · 3 mentions · first linked 2022-06-15
- /nonprofit/2 people · 3 mentions · first linked 2019-12-18
- Improving performance (and more) through load testing2 people · 3 mentions · first linked 2020-09-17
- BizOps: The Tools, the Process, the People2 people · 2 mentions · first linked 2021-01-15
- A deep dive into deeply recursive Go2 people · 2 mentions · first linked 2025-07-11
- Mattermost Raises $20M Series A Funding2 people · 2 mentions · first linked 2019-02-05
What Hacker News says?
There's Mattermost[1], which is an open source alternative to Slack. I haven't tried it yet so can't vouch for how it compares. [1] https://mattermost.com
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on “Slack’s new WYSIWYG input box is terrible”Submitted Making a Postgres query 1k times faster as a story · 228 points
HN discussionSo what's everyone's favourite forum software? Which of the many packages out there would actually be suitable to replicate the usability of Slack/Discord, without making all of the messages disappear like in a black hole? 1) Discourse: https://www.discourse.org/ Looks pretty modern and also offers managed instances if you'd like, but i can't help but to feel that it's pretty JS heavy and there is perhaps too much w…
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on “Use forums rather than Slack/Discord to support developer community”Submitted Coordinated disclosure of XML roundtrip vulnerabilities in Go’s standard library as a story · 223 points
HN discussion> Slack doesn't have an on-prem option. Microsoft Teams doesn't have an on-prem option. What are enterprises supposed to use, RocketChat? Matrix? With no clear migration path? Mattermost[1], with a clear migration path from Slack, at least. [1] https://mattermost.com/
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on “Slack Is Buying HipChat from Atlassian”Submitted Mattermost Raises $20M Series A Funding as a story · 142 points
HN discussion* Zulip https://zulipchat.com/ * Rocket.chat https://rocket.chat/ * Mattermost https://mattermost.com/ * Riot/Matrix https://riot.im/ And XMPP is not completely dead, depends on what you mean "comparable features".
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on “Slack Is Buying HipChat from Atlassian”Submitted Mattermost and Jitsi come together to deliver deeper collaboration as a story · 26 points
HN discussionYou can self host mattermost, which has been working well for us so far. https://mattermost.com/
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on “Slack Is Buying HipChat from Atlassian”Submitted Mattermost v7.0 is now available as a story · 18 points
HN discussionI can hardly see those as alternatives to Slack. Maybe https://mattermost.com/ is what you were thinking about?
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on “Slack is down”Submitted Mattermost Launches ChatOps: Open-Source, Real-Time DevOps as a story · 13 points
HN discussionFunnily enough, mattermost seems to list Uber as their client on their home page. https://mattermost.com Maybe they realised it was a superior solution to building their own app.
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on “Uber lays off 435 people”Submitted Making a Postgres query 1k times faster as a story · 12 points
HN discussionYour rant is misinformed, Uber uses Mattermost: https://mattermost.com/customers/uber/
Comment linking /customers/uber/
on “Uber lays off 435 people”Submitted Mattermost v7.0 is now available as a story · 12 points
HN discussionuChat is a fork of Mattermost, which looks like an exact copy too. https://mattermost.com/
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on “Uber lays off 435 people”Submitted Turning Neovim into a Full-Fledged Code Editor with Lua as a story · 12 points
HN discussionYes and no. I would love to use Slack over uChat, don't get me wrong, but uChat is a skin/integration of an enterprise chat app not a greenfield build. Look familiar? https://mattermost.com/
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on “Uber lays off 435 people”Submitted Go fixes its 7th code execution bug in the same feature as a story · 11 points
HN discussionAfter some searching I discovered https://mattermost.com/ . Anyone have experience with this?
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on “Slack closes account of an Iranian user living in Canada”Submitted An Introduction to Mattermost as Your DevOps Command Center as a story · 7 points
HN discussionWhat a great reason to switch to an open-source, self-hosted solution. Fortunately there exist several: http://sdelements.github.io/lets-chat/ https://rocket.chat/ https://mattermost.com/ https://zulipchat.com/
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on “Slack closes account of an Iranian user living in Canada”Submitted Turn Mattermost into a shared CLI with custom integrations as a story · 7 points
HN discussionThere is Mattermost https://mattermost.com/
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on “Slack closes account of an Iranian user living in Canada”Submitted YC leads $50M Series B in Mattermost as open source Slack alternative as a story · 7 points
HN discussionCertainly an opportunity for Discord, but I wonder how big of an opportunity. Their target audience is more casual whereas Slack's has shifted to more work/Enterprise-focused. So their audiences don't overlap as much as they used to. It will be interesting how this impacts Mattermost [1] though - an open source developer collaboration tool for Enterprises, a closer competitor to Slack. [1] http://mattermost.com/
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on “Salesforce Signs Definitive Agreement to Acquire Slack”Submitted How Remote Work Can Improve Developer Engagement and Retention as a story · 5 points
HN discussionThis feels like a corporate greed play, on what should be a relatively simple chat application. Slack has quickly become just another enterprise solution in search of shareholder value at expensive of data privacy. Regulation of these companies should be more apparent to people, but sadly, is not. I would recommend https://mattermost.com as an alternative.
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on “Slack AI Training with Customer Data”Submitted The Guide to Developer Productivity as a story · 5 points
HN discussion
