Mattermost vs SlackAPI

Mattermost (Mattermost is a secure collaboration platform for connecting your teams, tools and processes to accelerate mission-critical work.) and SlackAPI (https://docs.slack.dev/tools) both appear on the Smoower Developer Ecosystem Index.

Mattermost (rank #38) holds a narrow lead over SlackAPI (rank #47) on the overall Smoower ecosystem score (62 vs 61). The gap of 1 points reflects composite signals across code, docs, community and reach.

On code quality (the state of repositories, tests, releases and polish), SlackAPI is slightly ahead of Mattermost. On education (docs, guides and learning material for developers), Mattermost is slightly ahead of SlackAPI. On community (issue response, PR reviews and discussion health), Mattermost is slightly ahead of SlackAPI. On reach (how visible the ecosystem is beyond its own repos), Mattermost is clearly ahead of SlackAPI. On momentum (release cadence and how fast the ecosystem moves), Mattermost is slightly ahead of SlackAPI.

Mattermost carries 49,882 GitHub stars across 262 public repos, with 58 repositories active in the last 90 days and 105 external contributors on record. SlackAPI shows 17,894 stars across 37 public repos, 19 active in the last 90 days and 39 external contributors.

Mattermost is the stronger read for anyone weighting reach. SlackAPI 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.