Compare software

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

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