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kalker vs AlexCalc: catalog facts
kalker	AlexCalc
Free Free and open source under the MIT licence.	Free Free to use; the source is published under the AGPL-3.0.
Windows, macOS, Linux, Android, Web, Command line	Android, iOS, Web
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Formatted LaTeX display makes long equations easy to verify Handles units, variables and complex numbers
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	The on-screen layout is dense for a first-time user Formal releases are not published on GitHub
Downloadable app, Web application	Downloadable app, Web application
Open source	Open source
License: MIT	License: AGPL-3.0-only
No account needed	No account needed
Works offline	Not stated if it 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.