An associative note-taking app.

Thinktool's associative note-taking makes complex notes simple to explore. Freely connect related notes together with links, or add just the right structure by organizing notes into trees. Thinktool is the right tool for understanding complex topics.

Flexible structure.

In Thinktool, one note can be in multiple places at once. Use this feature to add structure to complex topics, so you can always get to the information you need.

Associative note-taking.

Use bidirectional links to associate related notes. With bidirectional links, you can write without worrying about how your notes should be structured. Just add links, and Thinktool will do the rest.

Seamless exploration.

Thinktool automatically shows you related notes – right there in the tree view. Easily jump to other places where a note exists with other parents, or see where it's mentioned with references.

Try it.

Thinktool is being actively developed.

In the future, it may become a paid subscription service, but you can use the preview for free. Click the button below to try a demo:

Go to demo

I'm also currently working on an offline app for Thinktool. You can already download a very early prototype.

Or try something else.

Thinktool is directly inspired by outliners like Org mode, Workflowy and Dynalist. The difference is that Thinktool lets you put one item in multiple places, so you're not limited to a hierarchy.

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.