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PCalc vs Chalk: catalog facts
PCalc	Chalk
Paid Paid app, sold separately for Mac and for iOS devices.	Free Free calculator software; the developer provides downloads.
macOS, iOS	macOS
RPN mode alongside standard entry with parentheses Hexadecimal, octal and binary calculations	Designed for both everyday and scientific calculations Documentation and examples are available
Apple platforms only Paid, with Mac and iOS versions bought separately	Available for macOS
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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