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KBruch vs IXL: catalog facts
KBruch	IXL
Free Free and open source under the GPL-2.0-or-later licence.	Paid Requires a paid membership.
Windows, macOS, Linux	Web
Five exercise types covering fractions, factorisation and percentages Checks answers and gives immediate feedback	Large K-12 skill library across several subjects Diagnostic and analytics for tracking progress
Narrow scope limited to fractions and percentages Plain interface aimed at school-age learners	Paid membership required Focused on K-12 curricula
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.