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Khan AcademyKBruch
Free

Free to use, funded by donations to the nonprofit.

 Free

Free and open source under the GPL-2.0-or-later licence.

Android, Web Windows, macOS, Linux
  • Free lessons and practice across many subjects
  • Tools for teachers to assign work and track progress
  • Five exercise types covering fractions, factorisation and percentages
  • Checks answers and gives immediate feedback
  • Signing up is needed to track progress
  • Follows a mostly school-style curriculum
  • Narrow scope limited to fractions and percentages
  • Plain interface aimed at school-age learners
Downloadable app, Web application Downloadable app
Closed source Open source
License not stated License: GPL-2.0-or-later
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.