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Slack has raised our charges by $195k per year

(skyfall.dev)
1806 points JustSkyfall | 1 comments | 18 Sep 25 01:37 UTC | HN request time: 0.234s | source
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jacinda ◴[18 Sep 25 06:57 UTC] No.45286414[source]▶
+1 to the other comments recommending Zulip over Mattermost. The threading model is fantastic.

Also, for a non-profit teaching coding note that they regularly have interns under the Google Summer of Code program and it's open source, so the students can even help with it.

https://summerofcode.withgoogle.com/programs/2025/organizati...

replies(2): >>45286533 #>>45287036 #
1. pcthrowaway ◴[18 Sep 25 08:26 UTC] No.45287036[source]▶
Mattermost is also open source, (AGPLv3 with lots of components optionally available via MIT or Apache terms). It does require contributors to sign a CLA though (unlike Zulip as far as I can tell?), and this likely reduces community involvement.

Mattermost has threads, though they work different from Zulip.

I haven't used both extensively, and for an open community like Hack Club, I suppose it's possible Zulip may even be a better fit. Mattermost will offer a much more direct migration path from Slack however.

I'm curious what makes some recommend Zulip so highly over Mattermost.