Circle of Fifths Auto
Seven music theory tools right at the instrument – on phone or tablet, fully offline and in six languages. From the circle of fifths through the chord builder to tuner and metronome.
Seven tools in one app
Everything you need at hand while practising and playing – without switching between apps.
Circle of fifths
All 24 keys interactively. Tap a key to see its accidentals, the relative major/minor key and matching chords in a detail popup.
Chord builder
Over 30 chord types with alias display (e.g. C6 ∼ Cadd13). A “special” mode lets you build your own voicings.
Scales & intervals
Scales to look up and hear; the interval view shows semitones, function and an audio example.
Guitar voicings
Fingering charts sorted by difficulty – from the simple open chord to the demanding voicing.
Waveforms
Animated display of how each tone and interval sounds – theory you can see.
Tuner & metronome
Chromatic tuner and metronome built right in – no second device needed.
Theory you can touch
Music theory often sits in a book and stays there. Circle of Fifths Auto turns that around: every concept is tangible, audible and usable at the instrument straight away. If you want to know which chords go together in a key, you tap the circle of fifths – instead of calculating. If you are looking for a voicing, you see the fingering chart. That turns abstract knowledge into a tool that really helps while playing.
For everyone who plays
Whether songwriting, practising, in lessons or for a quick look-up – the app adapts. No account, no sign-up, fully offline. The interface comes in six languages: German, English, Spanish, French, Japanese and Chinese.
First in the browser, then in your pocket
You can test the circle of fifths, scales and the chord finder right in the browser, with no installation. If you like it, the app gives you everything offline.
Frequently asked questions
Does the app cost anything?
No, it is free. It is funded through unobtrusive ads.
Does it work offline?
Yes, all tools are available immediately, completely without internet.
Which languages is it available in?
In six: German, English, Spanish, French, Japanese and Chinese.
Do I need an account?
No, no sign-up, no registration.