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KBruch vs Prodigy Math: catalog facts
KBruch	Prodigy Math
Free Free and open source under the GPL-2.0-or-later licence.	Freemium Educational content is free for students and teachers; parents can buy memberships.
Windows, macOS, Linux	Web
Five exercise types covering fractions, factorisation and percentages Checks answers and gives immediate feedback	Adaptive questions aligned with school standards Free full access for teachers
Narrow scope limited to fractions and percentages Plain interface aimed at school-age learners	Memberships add extras that children may ask for Aimed at school-age children only
Downloadable app	Web application
Open source	Closed source
License: GPL-2.0-or-later	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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