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Heynote vs Antinote: catalog facts
Heynote	Antinote
Free Free download with source code on GitHub.	Paid A one-time $5 purchase with lifetime updates and a free trial.
Windows, macOS, Linux	macOS
Blocks with per-block language, highlighting and auto-format Built-in calculator blocks with units and currencies	Opens instantly on a global hotkey Inline math with variables and unit and currency conversion
A scratchpad rather than a full note organiser or editor	macOS 14 or later only; iOS version not yet released Built for temporary notes rather than long-term organisation
Downloadable app	Downloadable app
Closed 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 October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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