Duolingo vs Heap

Duolingo and Heap (Product Insights) both appear on the Smoower Developer Ecosystem Index.

Duolingo (rank #338) holds a narrow lead over Heap (rank #569) on the overall Smoower ecosystem score (43 vs 35). The gap of 8 points reflects composite signals across code, docs, community and reach.

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

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. Heap shows 215 stars across 65 public repos, 6 active in the last 90 days and 1 external contributors. The star gap on its own does not decide the comparison, but Duolingo's footprint is roughly 8.0x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Duolingo is the stronger read for anyone weighting momentum. Heap looks better where education 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.