Terms of use
Last updated October 25, 2026
By using Accidentals at accidentals.app, you agree to these terms. If you don’t agree, please don’t use the app.
Using Accidentals
Accidentals is a tool for practicing music theory. You’re welcome to use it for your own learning and in teaching. Please don’t try to disrupt the service, copy it wholesale, or use it for anything unlawful.
Your progress
Your progress is currently saved only in your browser. We can’t recover it if your browser’s data is cleared, so we aren’t responsible for lost progress.
Our content
The app’s design, text, code and artwork belong to Accidentals. Music theory itself belongs to everyone.
No warranty
We work hard to keep the content correct, but Accidentals is provided “as is”, without warranties of any kind. We aren’t liable for any damages that come from using it, to the extent the law allows.
Changes
We’ll update these terms as the app grows (for example, when accounts or purchases arrive). The date at the top shows the latest version. Continuing to use Accidentals after an update means you accept the new terms.