About JSS
JSS is an authoring tool for CSS which allows you to use JavaScript to describe styles in a declarative, conflict-free and reusable way.
How many people use JSS
GitHub · npm- #12
Phabricator12k - #13
SonarQube11k - #14
Stitches7.8k - #15JSS7k
- #16
Firebase5.1k - #17
PHPDebugBar4.4k - #18gitlist3k
#15 of 28 Development we have counts for (of 54) · bars are GitHub stars across these neighbours; the category leader is Storybook at 91k · as of September 24, 2026
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JSS#15 of 28 Development
Stitches#14 of 28 Development
The two numbers disagree - one leads on stars, the other on installs. Stars measure attention, downloads measure use.
Audit any site that runs JSS.
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How we audit JSS
We measure the detected version against JSS's release history and grade the surrounding stack with a Lighthouse-grade quality audit. Weak or outdated links weigh more - one risky dependency can pull the whole score down.
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