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ArityCalc vs OpenCalc: catalog facts
ArityCalc	OpenCalc
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Complex number support 2D graphing of multiple functions and their derivatives	Small download with no unnecessary permissions Scientific mode and calculation history
Developer says it will stop working on certified Android devices once Google's verification rule applies Android only	Android only No releases published on the GitHub repository
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it 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.