Duolingo vs Engineering at Fullstory

Duolingo and Engineering at Fullstory (Fullstory APIs and Open-Source Projects) both appear on the Smoower Developer Ecosystem Index.

Duolingo (rank #338) holds a modest lead over Engineering at Fullstory (rank #625) on the overall Smoower ecosystem score (43 vs 33). The gap of 10 points reflects composite signals across code, docs, community and reach.

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

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. Engineering at Fullstory shows 19,439 stars across 63 public repos, 19 active in the last 90 days and 15 external contributors. The star gap on its own does not decide the comparison, but Engineering at Fullstory's footprint is roughly 11.3x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Duolingo is the stronger read for anyone weighting reach. Engineering at Fullstory looks better where community 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.