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a library for cross-platform cognitive assessments

Mobile first

Optimized for touch and mobile devices while also usable on desktops.


Use on browsers, compile within native apps, or embed in products like RedCap or Qualtrics. A shared assessment codebase reduces development time and promotes experiment standardization across devices and services.

Rapid iteration

Quickly develop and test new assessments with the JavaScript-based library and deploy them in studies.