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kalker vs SpeedCrunch: catalog facts
kalker	SpeedCrunch
Free Free and open source under the MIT licence.	Free Free and open source under the GPL.
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	Results update as you type Up to 50 digits of precision
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	Latest advertised release is the long-standing 0.12 Keyboard-centred design may not suit button-only users
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0-or-later
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.