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Plus42 vs Free42: catalog facts
Plus42	Free42
Free Desktop builds are free and open source under GPL-2.0; mobile store pricing is not stated.	Free Free and open source under the GPL-2.0 licence.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Faithful HP-42S behaviour with modern additions Plotting, units and TVM built in	Runs existing HP-42S programs No HP ROM image required
RPN workflow takes time to learn Aimed at HP calculator users rather than casual use	RPN keystroke interface has a learning curve for newcomers Modern extras such as plotting are in the separate Plus42 project
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
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

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.