Constella

Captures thoughts visually, connects ideas with AI, and aids decision-making in a secure environment. Free open source AI Second Brain that gives you unlimited, growing power. Constella uses local AI to index the contents of all your files and apps. Constella works on Mac, iOS, and Android, with web access in development. Constella offers a starter tier at no cost, with advanced features in paid plans. All data stays local or encrypted in user-owned buckets, with no third-party access. Constella supports imports from tools like Notion and Evernote. Constella focuses on visual graphs and AI connections, unlike Notion's document style. It supports full offline note-taking and local AI search.