Obsidian

Your ideas deserve a home that's as flexible as your thinking and as secure as your privacy demands. Obsidian isn't just another note-taking app; it's a private, customizable knowledge base that grows with you. Start for free, then seamlessly sync notes across devices, publish your work, or collaborate with your team all while keeping full ownership of your data. With built-in end-to-end encryption, detailed version history for notes, and powerful Obsidian collaboration features, it's engineered for individuals and teams who refuse to compromise between flexibility and security. Whether you're mapping complex projects, journaling privately, or building a shared team wiki, Obsidian adapts to your workflow not the other way around.