Duolingo vs ExpressVPN

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

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

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. ExpressVPN shows 1,250 stars across 12 public repos, 3 active in the last 90 days and 7 external contributors.

Duolingo is the stronger read for anyone weighting momentum. ExpressVPN 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.