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SpeedCrunch vs Plus42: catalog facts
SpeedCrunch	Plus42
Free Free and open source under the GPL.	Free Desktop builds are free and open source under GPL-2.0; mobile store pricing is not stated.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS
Results update as you type Up to 50 digits of precision	Faithful HP-42S behaviour with modern additions Plotting, units and TVM built in
Latest advertised release is the long-standing 0.12 Keyboard-centred design may not suit button-only users	RPN workflow takes time to learn Aimed at HP calculator users rather than casual use
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	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.