Duolingo vs KAYAK

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

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

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. KAYAK shows 3,186 stars across 72 public repos, 4 active in the last 90 days and 1 external contributors.

Duolingo is the stronger read for anyone weighting community. KAYAK 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.