15Five vs Mattermost

15Five and Mattermost (Mattermost is a secure collaboration platform for connecting your teams, tools and processes to accelerate mission-critical work.) both appear on the Smoower Developer Ecosystem Index.

Mattermost (rank #38) holds a meaningful lead over 15Five (rank #693) on the overall Smoower ecosystem score (62 vs 31). The gap of 31 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), Mattermost is clearly ahead of 15Five. On education (docs, guides and learning material for developers), Mattermost is ahead of 15Five. On community (issue response, PR reviews and discussion health), Mattermost is ahead of 15Five. On reach (how visible the ecosystem is beyond its own repos), Mattermost is clearly ahead of 15Five. On momentum (release cadence and how fast the ecosystem moves), Mattermost is clearly 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. Mattermost shows 49,882 stars across 262 public repos, 58 active in the last 90 days and 105 external contributors. The star gap on its own does not decide the comparison, but Mattermost's footprint is roughly 353.8x 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. Mattermost looks better where reach 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.