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PhotoDemon vs Acorn: catalog facts
PhotoDemon	Acorn
Free Free and open source.	Paid One-time purchase with no subscription, after a 14-day free trial.
Windows	macOS
Portable, runs from a USB stick without installing Opens PSD, PSP and XCF files	No subscription, paid once AI subject selection and Live Text tool built in
Windows only Mainly a single-developer project	macOS only Requires macOS 14 Sonoma or later
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
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 September 23, 2026

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