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SpeedCrunch vs kalker: catalog facts
SpeedCrunch	kalker
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Windows, macOS, Linux, Android, Web, Command line
Results update as you type Up to 50 digits of precision	Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices
Latest advertised release is the long-standing 0.12 Keyboard-centred design may not suit button-only users	Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-2.0-or-later	License: MIT
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.