Duolingo vs edX

Duolingo and edX (Online learning at https://edx.org, powered by the Open edX platform https://openedx.org) both appear on the Smoower Developer Ecosystem Index.

Duolingo and edX sit at essentially the same overall ecosystem score (43), which is unusual and worth reading through the pillars below.

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

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. edX shows 392 stars across 250 public repos, 52 active in the last 90 days and 22 external contributors. The star gap on its own does not decide the comparison, but Duolingo's footprint is roughly 4.4x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

Duolingo is the stronger read for anyone weighting reach. edX 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.