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IXL vs KBruch: catalog facts
IXL	KBruch
Paid Requires a paid membership.	Free Free and open source under the GPL-2.0-or-later licence.
Web	Windows, macOS, Linux
Large K-12 skill library across several subjects Diagnostic and analytics for tracking progress	Five exercise types covering fractions, factorisation and percentages Checks answers and gives immediate feedback
Paid membership required Focused on K-12 curricula	Narrow scope limited to fractions and percentages Plain interface aimed at school-age learners
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
Account needed	No account needed
Needs internet	Not stated if it works offline
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.