Langfuse vs Open WebUI

Langfuse (Open source AI engineering platform. Debug, analyze and iterate together.) and Open WebUI (On a mission to build the best AI user interface.) both appear on the Smoower Developer Ecosystem Index.

Langfuse (rank #63) holds a modest lead over Open WebUI (rank #189) on the overall Smoower ecosystem score (59 vs 50). The gap of 9 points reflects composite signals across code, docs, community and reach.

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

Langfuse carries 32,648 GitHub stars across 25 public repos, with 22 repositories active in the last 90 days and 147 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 Open WebUI's footprint is roughly 4.9x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Langfuse is the stronger read for anyone weighting reach. Open WebUI looks better where education 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.