The guitar language app.

Learn guitar skills

Courses in notes, intervals, chords, scales, and arpeggios with skills ranging from complete beginner to expert-level.

Instant feedback with AI note detection

Artificial intelligence hears what you play to give you immediate and accurate feedback.

Learn fast with spaced repetition

Learn vocabulary (notes, scales, chords, etc.) the fast way with a spaced repetition algorithm popularized in language-learning apps. Review concepts at the right time before you forget them.

Train your ear

Listening exercises foster your ability to hear chords, intervals, scales, and arpeggios and be able to play what you hear on your guitar.

Understand the Theory

Build a foundation for songwriting with simple and comprehensive lessons on each musical concept so you understand what you're playing.

Built-In Tuner

So you don't need a separate app to get ready for practice.

Think Fretzl could help you improve on guitar?

Frequently Asked Questions

Why isn't the app hearing the notes I play?

  • First, check that you're tuned up using the built-in tuner.

  • If it's still not picking up your notes, the problem could be because of a lot of background noise in your practice space.

  • Still having trouble? Please reach out to us at [email protected]. We'll try to get back to you as soon as we can.

I subscribed accidentally, what do I do?

As all payments for Fretzl are handled through the App Store, you'll have to contact Apple to handle this. Follow the steps described here.

How can I report a bug or suggest a new feature?

Please reach out to us at [email protected]. We love to get your input, keep an eye out for updates with fixes and new¬†features.

Privacy Policy

We respect your privacy, so we don't collect any of your personal information. We won't ask you to enter any personal data, and payments are handled completely by Apple.Fretzl requests access to your microphone solely to detect what notes you play. All processing of the recorded audio is performed on your device, so we collect absolutely no data.


Big thanks to these rad open source projects and libraries:


We'll keep you posted on any updates about Fretzl!