Duolingo vs TaxJar

Duolingo and TaxJar (Making sales tax filing easier for more than 20,000 online sellers and merchants across the world.) both appear on the Smoower Developer Ecosystem Index.

Duolingo (rank #338) holds a modest lead over TaxJar (rank #693) on the overall Smoower ecosystem score (43 vs 31). The gap of 12 points reflects composite signals across code, docs, community and reach.

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

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. TaxJar shows 490 stars across 39 public repos, 1 active in the last 90 days and 3 external contributors. The star gap on its own does not decide the comparison, but Duolingo's footprint is roughly 3.5x larger, which usually shows up in downstream signals like inbound issues and third party integrations.

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