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SideNotes vs Heynote: catalog facts
SideNotes	Heynote
Paid Commercial Mac app from Apptorium; check the developer's site for current pricing.	Free Free download with source code on GitHub.
macOS	Windows, macOS, Linux
Notes panel appears at the screen edge without app switching Markdown, tasks, images and colors in notes	Blocks with per-block language, highlighting and auto-format Built-in calculator blocks with units and currencies
Mac only Suited to quick notes rather than a large knowledge base	A scratchpad rather than a full note organiser or editor
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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