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SideNotes vs Google Keep: catalog facts
SideNotes	Google Keep
Paid Commercial Mac app from Apptorium; check the developer's site for current pricing.	Free Free to use with a Google account.
macOS	Web
Notes panel appears at the screen edge without app switching Markdown, tasks, images and colors in notes	Quick capture of notes and checklists Reminders built in
Mac only Suited to quick notes rather than a large knowledge base	Requires a Google account Notes are stored on Google's servers
Downloadable app	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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