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kalker vs Numbat: catalog facts
kalker	Numbat
Free Free and open source under the MIT licence.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Android, Web, Command line	Windows, macOS, Linux
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Unit-aware calculations with dimension checking
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	Requires learning its expression and language syntax.
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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