Standard Notes end-to-end encrypts every note so neither the company nor Proton, which acquired it in 2024, can read your writing. The apps are open source under AGPL and have been through four independent security audits, making it one of the most scrutinized options here. The catch is that the free tier is plain text only; rich text, file attachments and extra editors sit behind the paid Productivity and Professional plans. If you value long-term trustworthiness and a verifiable track record over fancy formatting, this is the safe default.
Standard Notes
Audited, open-source encrypted notes built to last.
standardnotes.comFreemiumOpen SourceE2E EncryptedWindowsmacOSLinuxAndroidiOSWebUnited States
PricingFree plan covers unlimited plain-text notes on every device; Productivity ($90/yr) and Professional ($120/yr) add rich text, file attachments and more.
Strengths
- End-to-end encrypted, open source under AGPL
- Four independent third-party security audits
- Now backed by Proton
- Runs on every major platform
Considerations
- Free tier is plain text only
- Rich text and file attachments need a paid plan
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