Stream vs Mattermost

Stream (Build scalable in-app chat, feeds, and live video with AI moderation capabilities in hours, not weeks.) 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 #41) holds a modest lead over Stream (rank #317) on the overall Smoower ecosystem score (62 vs 44). The gap of 18 points reflects composite signals across code, docs, community and reach.

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

Stream carries 35,664 GitHub stars across 487 public repos, with 84 repositories active in the last 90 days and 44 external contributors on record. Mattermost shows 49,882 stars across 262 public repos, 58 active in the last 90 days and 105 external contributors.

Stream is the stronger read for anyone weighting momentum. 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.