Note Flow is a note-taking and personal knowledge management service made in Russia. It helps users capture thoughts, ideas, journal entries, reading notes, and project information in one organized space. The service combines Markdown and a visual editor, with notes compatible with Obsidian and other text editors. Backlinks connect related notes and show which pages refer to one another, while a graph-based structure can help users discover connections between ideas.

Note Flow also offers full-text search with filters for tags, dates, and links, plus automatic synchronization across phones, tablets, and computers. Notes are encrypted on the user’s device, and the service states that only the user holds the key. Users can choose from several appearance themes or customize their own. Note Flow offers a free plan with no payment card required, alongside paid plans. The website reports more than 120,000 users, 14 million notes created, 99.97% annual uptime, and an average rating of 4.8 stars.