Buffer vs Duolingo

Buffer (Helping people build their business on social media since 2011) and Duolingo both appear on the Smoower Developer Ecosystem Index.

Duolingo (rank #338) holds a narrow lead over Buffer (rank #455) on the overall Smoower ecosystem score (43 vs 39). The gap of 4 points reflects composite signals across code, docs, community and reach.

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

Buffer carries 11,181 GitHub stars across 196 public repos, with 4 repositories active in the last 90 days and 0 external contributors on record. Duolingo shows 1,721 stars across 12 public repos, 8 active in the last 90 days and 11 external contributors. The star gap on its own does not decide the comparison, but Buffer's footprint is roughly 6.5x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Buffer is the stronger read for anyone weighting education. Duolingo 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.