A tool for taking associative notes
Thinktool's associative note-taking makes interconnected notes simple to explore. Freely connect related notes together with bidirectional links, or organize notes into loose outlines with multiple parents. Thinktool is the right tool for understanding complex topics.
Any outliner lets you organize your notes into a hierarchy, but sometimes it's hard to choose where a note belongs. With multiple parents, you can add the same notes to multiple topics, and Thinktool will keep everything in sync.
Use bidirectional links to associate related notes. When you type a link, Thinktool will automatically add a link in the other direction. They let you quickly connect related items while writing. You can always come back later and add more structure.
Most notes only make sense in context. With Thinktool, you can see references and other parents right there in the outline – even references and other parents. Of course, you can still jump between items if you need to.
Thinktool is my side project. I'm currently using it as my main note-taking app, but it may still be buggy and unstable.
I'm also working on an offline app for Thinktool. You can download a early prototype.
Roam Research is another associative note-taking application, and it's much more polished than Thinktool. Roam supports bidirectional linking like Thinktool, but it doesn't have support for multiple parents.