Duolingo vs MailerSend

Duolingo and MailerSend (Email service that delivers) both appear on the Smoower Developer Ecosystem Index.

Duolingo (rank #338) holds a narrow lead over MailerSend (rank #401) on the overall Smoower ecosystem score (43 vs 41). The gap of 2 points reflects composite signals across code, docs, community and reach.

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

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. MailerSend shows 499 stars across 22 public repos, 12 active in the last 90 days and 7 external contributors. The star gap on its own does not decide the comparison, but Duolingo's footprint is roughly 3.4x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

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