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x11-calc vs Calculator: catalog facts
x11-calc	Calculator
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL-3.0 licence.
Linux	Linux
Faithful simulation of many HP calculator models Runs original firmware for accurate behaviour	Native look on the COSMIC desktop History of earlier calculations you can reuse
Niche audience familiar with HP calculators Linux-focused distribution	Basic calculator without advanced scientific features documented Designed mainly for COSMIC
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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