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kalker vs microMathematics Plus: catalog facts
kalker	microMathematics Plus
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0.
Windows, macOS, Linux, Android, Web, Command line	Android
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Formulas shown in readable mathematical notation Worksheet keeps calculations together for reuse
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	Android only Worksheet approach takes some learning compared with a plain calculator
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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