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RPN vs x11-calc: catalog facts
RPN	x11-calc
Free Free and open source under GPL-3.0-or-later.	Free Free and open source under the GPL-3.0-or-later licence.
Android	Linux
Stack-based Reverse Polish Notation Fixed-point decimal arithmetic	Faithful simulation of many HP calculator models Runs original firmware for accurate behaviour
Does not include scientific functions, unit or base conversions, programmability, or memory registers	Niche audience familiar with HP calculators Linux-focused distribution
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
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 8, 2026	Official website Full listing and sources Checked October 1, 2026

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