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