About this site
| Site name | Demo Track Maker |
|---|---|
| URL | https://ktkwmr.com/demotrackmaker/ |
| Operator | ktkwmr (individual developer) |
| What we offer | A free web app for making song demos: it turns a chord progression into bass, piano and drum backing, records vocals or instruments on top, and exports WAV, MP3, MIDI or the whole project |
| Contact | GitHub Issues |
What it is for
Demo Track Maker is a sketchpad for song demos, practice backing tracks, and arrangement ideas. It is not meant to replace a recording studio or a DAW (digital audio workstation): for detailed editing and mixing, export the tracks as WAV or the backing as MIDI and continue in a DAW.
Contact
For questions, bug reports, and suggestions, please open an issue on GitHub Issues. A GitHub account (free) is required.
Issues are public. Do not include personal information, and do not attach your recordings. For a problem, the steps to reproduce it, your browser, and your device are enough.
Disclaimer
- The backing is generated automatically from patterns, with synthesized sounds. We do not guarantee that it suits your song, or that the information on this site is correct or complete.
- Recording timing depends on the device and the audio interface. Use “Recording latency” in the app's settings to line up the takes.
- Your project is kept in your browser. It can be lost if the browser's data is cleared. Export the projects you want to keep as zip files.
- Record and publish only songs you wrote or have the rights to use. You are responsible for how you use the files you make.
- We are not responsible for any loss or damage resulting from the use of this site.
- Links to other websites are provided for convenience. We are not responsible for their content.
- The content of this site may be changed or removed, and the service may be stopped, without notice.
Copyright
- The app's source code is published under the MIT License. The library used by the app (lamejs, for MP3, based on LAME) is listed under Settings → About in the app.
- The backing patterns and sounds are made by the app; you may use the backing you make in your own songs and demos.
- The text and images on this site are © 2026 ktkwmr.
Privacy
How this site handles information is described in the privacy policy.