Duolingo vs PostHog

Duolingo and PostHog (The single platform to analyze, test, observe, and deploy new features) both appear on the Smoower Developer Ecosystem Index.

PostHog (rank #30) holds a modest lead over Duolingo (rank #338) on the overall Smoower ecosystem score (63 vs 43). The gap of 20 points reflects composite signals across code, docs, community and reach.

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

Duolingo carries 1,721 GitHub stars across 12 public repos, with 8 repositories active in the last 90 days and 11 external contributors on record. PostHog shows 40,775 stars across 357 public repos, 87 active in the last 90 days and 212 external contributors. The star gap on its own does not decide the comparison, but PostHog's footprint is roughly 23.7x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Duolingo is the stronger read for anyone weighting reach. PostHog looks better where momentum 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.