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kalker vs eva: catalog facts
kalker	eva
Free Free and open source under the MIT licence.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Android, Web, Command line	Windows, macOS, Linux, Command line
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Interactive REPL or one-off expressions from the command line Syntax highlighting and persistent history
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	No packaged releases on GitHub A plain calculator, not a full programming language like bc
Downloadable app, Web application	Downloadable app
Open source	Open source
License: MIT	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

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