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PCalc vs KCalc: catalog facts
PCalc	KCalc
Paid Paid app, sold separately for Mac and for iOS devices.	Free Free and open source under the GPL-2.0-or-later licence.
macOS, iOS	Linux
RPN mode alongside standard entry with parentheses Hexadecimal, octal and binary calculations	Scientific, statistics and numeral system modes Results stack for recalling previous answers
Apple platforms only Paid, with Mac and iOS versions bought separately	No graphing Best integrated with KDE Plasma
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-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 September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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