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 split a topic into subtopics, but sometimes items don't belong to just one category. With this feature, you can put each note in multiple places.
Use bidirectional links to associate related notes. With bidirectional links, you can just start writing, and worry about structuring your notes later. Thinktool will automatically show you the links you've added between notes – in both directions.
Thinktool shows everything right there in the outline view. You can see references and other parents without clicking on anything, giving you seamless and context-aware exploration.
I'm actively working on Thinktool. It may become a paid service in the future (aiming for ≤$5/mo.), but while it's still in early development, you can use it for free.Sign Up
I'm also currently working on an offline app for Thinktool. You can download a early prototype.
(Or try something else.)
Roam Research is another associative note-taking application, and it's much more polished than Thinktool. I'd recommend it! That being said, Roam is mostly focused on linking, and is a bit worse than Thinktool at structuring lots of notes.