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kalker vs Math Expression Evaluator: catalog facts
kalker	Math Expression Evaluator
Free Free and open source under the MIT licence.	Free Free and released into the public domain.
Windows, macOS, Linux, Android, Web, Command line	Android
Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices	Supports named variables in calculations Text-based input similar to a programming language
Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate	Basic compared with MathCad or Octave Android only
Downloadable app, Web application	Downloadable app
Open source	Closed source
License: MIT	License: Public domain
No account needed	Not stated if an account is 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.