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

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