Affirm vs Duolingo

Affirm and Duolingo both appear on the Smoower Developer Ecosystem Index.

Duolingo (rank #338) holds a narrow lead over Affirm (rank #485) on the overall Smoower ecosystem score (43 vs 38). 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), Affirm is slightly ahead of Duolingo. On education (docs, guides and learning material for developers), Affirm is clearly ahead of Duolingo. On community (issue response, PR reviews and discussion health), Duolingo is slightly ahead of Affirm. On reach (how visible the ecosystem is beyond its own repos), Duolingo is ahead of Affirm. On momentum (release cadence and how fast the ecosystem moves), Duolingo is ahead of Affirm.

Affirm carries 207 GitHub stars across 116 public repos, with 9 repositories active in the last 90 days and 4 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 Duolingo's footprint is roughly 8.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Affirm 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.