For rekordbox DJs
Blendbook reads your rekordbox history, chains blends you've already played into your next set, and sends it back as a playlist. It brings back favourites you dropped, and while you mix it suggests the next track and warns when both basses are up.
Free and open source, no account. Needs rekordbox 6 or 7 with a set in its History, and Chrome or Edge.
124 → 129 BPM · 7 tracks
An example with made-up tracks. Pick a shape: yours is built from your own history.
What it does
rekordbox already logs every set. Blendbook uses that history, with tempo, key and energy from rekordbox's own analysis, to plan the next one and review the last.
Live
Follows your set as rekordbox logs it, ranks your library for the next track, and watches both basses on your controller.
Now playing
Play next
A phone view follows the same set, for reading the next track with the laptop on the booth.
Taste
Your signature blends, the favourites you've dropped, and the part of your library that has never left the house.
Forgotten favourites
Never played out
Sessions
What happened, where tempo or energy slipped, and one habit to work on next time.
Tempo through the set
Dig
Artists like the ones in your plan, filtered to its sound and tempo, each with a 30-second preview and links to Apple Music, Spotify and Beatport.
Dig around this set
How it works
Blendbook reads a copy of your rekordbox library, never the live one.
Track to track, the transitions that worked for you before, chained by tempo, key and energy.
In its own Blendbook folder in rekordbox, after a backup.
Every set you've played is a lesson. Blendbook reads it back to you.
Privacy
No account, no analytics, no tracking. Blendbook runs on your machine and opens in your browser. Even this page loads nothing from anyone else.
Set up
You need rekordbox 6 or 7 with at least one set in its History, and Chrome or Edge for every feature.
The quickest way. Python and everything else is built in.
Get the installer from the latest release.
Mac: the .dmg for Apple Silicon (arm64) or Intel (x86_64). Windows 10 or 11: the setup.exe.
Install it. On a Mac, open the .dmg and drag Blendbook to Applications. On Windows, run the installer; it needs no admin rights.
Confirm it once. Blendbook isn't signed with a paid certificate yet, so your computer asks the first time.
Open Blendbook and dismiss the warning. Then go to System Settings, Privacy & Security, scroll down and press Open Anyway.
On the "Windows protected your PC" screen, press More info, then Run anyway.
That's it. Blendbook opens in your browser and lives as a small icon in the menu bar or system tray.
For people who'd rather see what they're running. You need Python 3.12 or newer and git.
Mac
git clone https://github.com/ujjaidasani/blendbook.git
cd blendbook
python3 -m venv .venv
.venv/bin/pip install -r requirements.txt
.venv/bin/python app.pyWindows (PowerShell)
git clone https://github.com/ujjaidasani/blendbook.git
cd blendbook
py -m venv .venv
.venv\Scripts\pip install -r requirements.txt
.venv\Scripts\python app.pyLook for the address. It prints Blendbook … running at http://localhost:8080 and opens your browser. If 8080 is busy it takes the next free port.
Check the badge. Top right should read "rekordbox · N sets". If it says rekordbox wasn't found, open Settings, press Choose folder… and pick the folder that holds master.db.
Optional: install ffmpeg to analyse mix recordings, and add an Anthropic API key in Settings for free-form coaching.
The full guide, with troubleshooting, is in SETUP.md.
Paste this into a coding assistant that can run commands on your computer, such as Claude Code, Cursor or Codex. It checks what you have, installs Blendbook from source, and confirms it reads your library. In a plain chat app it works as a step-by-step guide.
Help me set up Blendbook on this computer. It's a free, open-source companion app for rekordbox DJs: https://github.com/ujjaidasani/blendbook Work through these steps one at a time. Run the commands yourself if you can, otherwise tell me exactly what to type. Wait for me whenever a step needs my input. 1. Check what I have: my operating system (macOS or Windows), Python 3.12 or newer (python3 --version, or py --version on Windows), git, and rekordbox 6 or 7 with at least one set in its History. If Python or git is missing, tell me the simplest way to install it, then wait. 2. Get the code: git clone https://github.com/ujjaidasani/blendbook.git, then work inside the blendbook folder. 3. Create a virtual environment in .venv and install requirements.txt into it. macOS: python3 -m venv .venv, then .venv/bin/pip install -r requirements.txt Windows: py -m venv .venv, then .venv\Scripts\pip install -r requirements.txt 4. Confirm the install by running the tests with the virtual environment's Python: python -m unittest discover -s tests. They should all pass. 5. Start Blendbook with the virtual environment's Python: python app.py. It prints "Blendbook ... running at http://localhost:8080" and opens my browser. If port 8080 is busy it uses the next free one, so read the address it prints. 6. Check it worked: the badge at the top right of the page should say "rekordbox · N sets". If it says rekordbox wasn't found, help me find the folder that holds master.db (macOS: ~/Library/Pioneer/rekordbox, Windows: %APPDATA%\Pioneer\rekordbox) and set it in Settings, Choose folder. 7. Optional extras. Ask me before each one: - ffmpeg, for analysing mix recordings (macOS: brew install ffmpeg, Windows: winget install ffmpeg). - An Anthropic API key, for free-form coaching. Don't ask me to paste a key into this chat. I'll type it into Blendbook's Settings myself. Rules: - Blendbook only reads a copy of my rekordbox library. Don't change, move or delete anything in the rekordbox folder. - Don't use sudo or administrator rights, and don't install anything system-wide without asking me first. - I should use Chrome or Edge for the Blendbook page. - If a step fails, show me the exact error and fix that before moving on. Finish by telling me how to start Blendbook next time, and how to stop it.
Free, MIT licensed, nothing uploaded.