This repository contains the source code of Thinktool, an associative note-taking application inspired by TheBrain and Roam Research.

Check out the demo in your browser here!

(Screenshot showing links, backreferences and multiple parents.)

After watching some of Scott Scheper's really interesting videos on his Antinet, I started to reconsider some of my opinions on digital Zettelkasten. These new opinions lead me to experiment with implementing a much simpler Zettelkasten system for Emacs called zt. Although this implementation has fewer features than Thinktool, I think it is actually far more useful in practice.

Check out the README for that project for some ideas for how you can build a useful Zettelkasten, even if you don't actually intend to use it. I also recommend some alternative software on that page.

Because I'm now using zt as my primary note-taking system, I guess I won't be spending much time on Thinktool.

You are welcome to use the offline desktop version. However, I highly recommend against using the hosted web version. To the best of my knowledge, no one is using this, and I'm planning on taking it down soon. If you need to export your data, log in as normal and then go to https://api.thinktool.io/state. Alternatively, write to me at jonas@thinktool.io, and I'll do it for you. This is just a JSON export – it's up to you to turn it into something useful.

Offline client: Obsidian and Logseq have excellent offline clients, which let you store your data in Markdown files locally. Thinktool does have an offline desktop client, but it's janky in comparison and uses a SQLite database for data storage.

Graph structure: Roam Research, Logseq and Obsidian let you link different pages together and use that graph structure to explore your notes. However, only pages -- not individual items -- can be connected like this. In contrast, Thinktool lets you connect individual items to multiple parents, so the same item can exist in multiple places.

Transclusion: To work around the issue of connecting individual items, Roam Research and Logseq support embedding (transcluding) blocks. However, recursive transclusion is not supported, and transclusions are second-class. Thinktool doesn't need transclusion, because the same item can simply exist in multiple places -- there is no difference between the "original" item and its clones.

Hierarchical structure: If you want to connect pages hierarchically, Roam Research, Logseq and Obsidian require you to create a separate index page where you link the different pages together (or use some other custom system). Thinktool makes no distinction between pages and items, so you can simply add one page as a child of another page.

Bidirectional links: All of these tools, including Thinktool are built around bidirectional linking and have similar features.

Miscellaneous features: Roam Research, and to a lesser extent Logseq, have a bunch of neat features that let you use it for task management, spaced repetition and more. Thinktool is designed just for note-taking, so it doesn't have a lot of extra features.

Ease of use and UI: Even though Thinktool's data model is arguably simpler than these other tools, the UI is quite a bit worse, so it ends up being harder to understand.

All content of this repository to which I own the copyright is licensed under the terms of the GNU AGPLv3 or any later version as described in LICENSE.md.

This repository is not currently accepting issues or pull requests. Please see Thinktool's web page for information about how to contact me with your feedback about Thinktool. I may occationally force push to this repository, since I'm not expecting anyone else to be actively working on it. You are welcome to create your own fork.

The instructions in this README are mostly written for myself, and may not be sufficient to compile this project on your own. However, you can find some hints on how to run it in .github/workflows.

You will always be able to compile and use this version of Thinktool for free. The online service hosted at https://thinktool.io may eventually become a subscription service, but it's currently also free, and probably will be for a while.

The application consists of three parts:

1. Web client in src/web
2. Node.js server in src/server
3. Electron-based desktop client in src/desktop

To build the server, run docker build . -f tools/Dockerfile -t thinktool from the top-level directory, and then run the thinktool image with the environment variables listed below.

To build the web client, run yarn install --frozen-lockfile && yarn build from the src/web directory. This will build the web client into out/, which can then be deployed as a static website.

Before running this command, set the following environment variables:

• DIAFORM_API_HOST — API server host, including the protocol, e.g. https://api.thinktool.io.
• THINKTOOL_ASSETS_HOST — Host for desktop client, including the protocol, e.g. https://assets.thinktool.io.

The desktop client can currently be built for Linux and Windows. We're planning on supporting macOS in the future. It must be built on the same platform that is being targeted.

Start by setting the following environment variables:

• DIAFORM_API_HOST — API server host, including the protocol, e.g. https://api.thinktool.io.

Then enter the src/desktop directory and run yarn install --frozen-lockfile. Build the Linux client with yarn bundle-linux or the Windows client with yarn bundle-windows.

When developing the desktop client, you can use this command to somewhat hackily use the local build of the client package:

cp -r ../client/dist/* node_modules/@thinktool/client/dist/ && yarn bundle-linux

The server uses a PostgreSQL database. Set the following environment variables before running the server:

• DIAFORM_POSTGRES_HOST — The hostname containing the database, e.g. localhost
• DIAFORM_POSTGRES_PORT — Port that the database is running on, e.g. 5432
• DIAFORM_POSTGRES_USERNAME — Username used to authenticate with the PostgreSQL DB, e.g. postgres
• DIAFORM_POSTGRES_PASSWORD — Password used to authenticate with the PostgreSQL DB, e.g. postgres

You will need to manually set up the database schema. See tools/db/_initialize.sql, though this may be outdated.

For sending emails (used for "Forgot my password" functionality), we use Mailgun. Configure the following environment variables:

• MAILGUN_API_KEY — API key

Additionally, the server expects the following environment variables to be set:

• DIAFORM_STATIC_HOST — Base URL of the server hosting static resources, e.g. https://thinktool.io

Build the server as a Docker image:

# docker build -t thinktool -f tools/Dockerfile .

Once you have the thinktool image, run it with the environment variables given above:

# docker run \
    -e DIAFORM_POSTGRES_HOST \
    -e DIAFORM_POSTGRES_PORT \
    -e DIAFORM_POSTGRES_USERNAME \
    -e DIAFORM_POSTGRES_PASSWORD \
    -e MAILGUN_API_KEY \
    -e DIAFORM_STATIC_HOST \
    -p 80:80 \
    thinktool

To develop the web client against the current client package, run:

$ yarn webpack --watch --config webpack.config.js

inside the client/ subdirectiory, and then from the web/ directory, run:

$ yarn install --immutable
$ yarn build

Now, to manually rebulid after each change (see under Desktop above for why this is necessary), run:

$ rm -r .next; cp -r ../client/dist/* node_modules/@thinktool/client/dist/ && yarn dev

Make sure the environment variables described above are set correctly, and that the server is running, for example with:

$ docker run -ti --rm -p 9000:9000 \
    -e DIAFORM_POSTGRES_HOST \
    -e DIAFORM_POSTGRES_POST=5432 \
    -e DIAFORM_POSTGRES_USERNAME=postgres \
    -e DIAFORM_POSTGRES_PASSWORD \
    -e DIAFORM_STATIC_HOST=http://localhost:3000 \
    -e DIAFORM_PORT=9000 \
    c2d7fa/thinktool:latest 

The website is built using NextJS and hosted using Vercel. It is automatically rebuilt from the src/web directory whenever the website branch is pushed.

As with the desktop client, there is a hacky solution for using the current local client package build while working on the website:

cp -r ../client/dist/* node_modules/@thinktool/client/dist/ && rm -r .next && yarn dev

While working on Thinktool, most changes should be made in the src/client directory, since this is the package that's used for both the web client and the desktop client. Enter the src/client directory and run yarn install --frozen-lockfile and use yarn webpack serve --open --config webpack.dev.js to continually rebuild.

When you are ready to push out a client-side update, run tools/dev/release-client.sh <client-version>. This will bump the version number to <client-version>, publish the package, and also update the relevant dependency in the web and desktop clients.

Manually update the version number in the package.json for the desktop package, commit the changes, tag the commit with a tag of the form x.y.z and push to GitHub. A workflow should automatically create a GitHub release; manually update this release with the release notes.

Note that the tag should be the same as the desktop client version, while the version number for the client package may be different!