
Standard Notes
Audited, open-source encrypted notes built to last.
Your notes hold some of your most personal information: passwords, journal entries, half-formed ideas and plans you would never post publicly. Most mainstream note apps store all of that on company servers in readable form, where it can be scanned, subpoenaed or leaked. A private notes app encrypts your writing so only you can read it. The trade-off is usually convenience: end-to-end encryption often means fewer collaboration features and the most private apps ask a little more setup in return for keeping your thoughts to yourself.
The right notes app depends on how much you write, how many devices you sync, and how much control you want over where your data lives. Some people want a polished, managed service that just works; others want to own the files and pick their own storage. Encryption is the baseline but licensing, jurisdiction, audit history and whether the app is actively maintained are all worth weighing for something you will trust for years. Start from your threat model and work outward.
Here are some things to look for.

Audited, open-source encrypted notes built to last.

Fully open-source encrypted notes with a generous free tier.

Open-source Markdown notebook that syncs to storage you control.

Encrypted documents and a private photo vault in one.

Local-first, encrypted alternative to Notion.

Local-first, open-source outliner on plain-text files you own.

Local-first Markdown notes and knowledge base

Self-hostable hierarchical knowledge base