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Math Expression Evaluator vs kalker: catalog facts
Math Expression Evaluator	kalker
Free Free and released into the public domain.	Free Free and open source under the MIT licence.
Android	Windows, macOS, Linux, Android, Web, Command line
Supports named variables in calculations Text-based input similar to a programming language	Natural math syntax with user-defined functions and variables Handles complex numbers, vectors and matrices
Basic compared with MathCad or Octave Android only	Derivatives and integrals are numerical estimates Higher-order derivatives can be inaccurate
Downloadable app	Downloadable app, Web application
Closed source	Open source
License: Public domain	License: MIT
Not stated if an account is 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.