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 #31) holds a modest lead over Open WebUI (rank #190) on the overall Smoower ecosystem score (63 vs 50). The gap of 13 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), Open WebUI is slightly ahead of Anthropic. 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), Anthropic is slightly ahead of Open WebUI. On momentum (release cadence and how fast the ecosystem moves), Anthropic is slightly ahead of Open WebUI.

Anthropic carries 584,923 GitHub stars across 93 public repos, with 47 repositories active in the last 90 days and 873 external contributors on record. Open WebUI shows 159,650 stars across 25 public repos, 12 active in the last 90 days and 198 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 community. Open WebUI 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.