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kalker vs Schulrechner: catalog facts
kalker	Schulrechner
Free Free and open source under the MIT licence.	Free Free and open source under GPL-3.0-only.
Windows, macOS, Linux, Android, Web, Command line	Linux, Android, Web
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Shows equation results as fractions and decimals Supports implicit multiplication
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	The F-Droid listing describes an early version with unlabeled buttons
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: MIT	License: GPL-3.0-only
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 8, 2026

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