Anthropic vs Open WebUI

Anthropic and Open WebUI (On a mission to build the best AI user interface.) both appear on the Smoower Developer Ecosystem Index.

Anthropic (rank #45) holds a narrow lead over Open WebUI (rank #97) on the overall Smoower ecosystem score (63 vs 58). 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), Open WebUI is ahead of Anthropic. On education (docs, guides and learning material for developers), Anthropic is slightly ahead of Open WebUI. On community (issue response, PR reviews and discussion health), Anthropic is slightly ahead of Open WebUI. On reach (how visible the ecosystem is beyond its own repos), Open WebUI is clearly ahead of Anthropic. On momentum (release cadence and how fast the ecosystem moves), Anthropic is ahead of Open WebUI.

Anthropic carries 608,522 GitHub stars across 97 public repos, with 45 repositories active in the last 90 days and 736 external contributors on record. Open WebUI shows 164,397 stars across 25 public repos, 10 active in the last 90 days and 180 external contributors. The star gap on its own does not decide the comparison, but Anthropic's footprint is roughly 3.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Anthropic is the stronger read for anyone weighting momentum. Open WebUI 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.