15Five vs Zulip

15Five and Zulip (Organized team chat) both appear on the Smoower Developer Ecosystem Index.

Zulip (rank #536) holds a narrow lead over 15Five (rank #693) on the overall Smoower ecosystem score (36 vs 31). The gap of 5 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), Zulip is clearly ahead of 15Five. On community (issue response, PR reviews and discussion health), Zulip is ahead of 15Five. On reach (how visible the ecosystem is beyond its own repos), Zulip is ahead of 15Five. On momentum (release cadence and how fast the ecosystem moves), Zulip is slightly ahead of 15Five.

15Five carries 141 GitHub stars across 29 public repos, with 2 repositories active in the last 90 days and 5 external contributors on record. Zulip shows 32,299 stars across 67 public repos, 9 active in the last 90 days and 76 external contributors. The star gap on its own does not decide the comparison, but Zulip's footprint is roughly 229.1x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

15Five is worth a look for teams already invested in its stack. Zulip looks better where code quality is the deciding factor. The table below breaks the scores down pillar by pillar; the linked profiles cover the underlying repos, docs and community signals in full.