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Open Note Scanner vs Adobe Scan: catalog facts
Open Note Scanner	Adobe Scan
Free The open-source application is available without a license fee.	Free Free to download; advanced PDF features need a paid Acrobat Pro subscription.
Android	Android, iOS
Fully open source with no account or cloud component Automatic edge detection and perspective correction	Automatic boundary detection and perspective correction Built-in OCR for searchable PDFs
Rougher than commercial scanner apps Development is intermittent	Combining and converting files requires paid Acrobat Pro Mobile only
Downloadable app	Downloadable app
Open 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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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