Free on iOS and Android
My Pocket Guitar Tuner
A chromatic tuner that names the note the moment you play it. For acoustic, classical or electric guitar.
Common chord circles
A chord circle is four chords that sound good together in one key, played in a loop: I, vi, ii and V7. A huge number of songs use one. Start with C and G, which use only open chords; the later circles add barre chords.
Strings run from low E on the left to high E on the right. Numbers are fingers: 1 index, 2 middle, 3 ring, 4 pinky. A circle above a string means play it open; × means don't play it. A bar means your index finger presses several strings at once, and a label like "3fr" means the diagram starts at the 3rd fret.
Tune up first: every chord sounds wrong on an out-of-tune guitar.
Circle of C
C – Am – Dm – G7
Circle of G
G – Em – Am – D7
Circle of D
D – Bm – Em – A7
Circle of A
A – F#m – Bm – E7
Circle of E
E – C#m – F#m – B7
Circle of F
F – Dm – Gm – C7
Circle of B
B – G#m – C#m – F#7
What it does
Hears your note instantly
Play a string and it names the note through your phone's microphone.
Sharp or flat
Shows how far off you are, so you know which way to turn the peg.
Green when in tune
A green light tells you the string is right.
Standard tuning guide
E A D G B E, from the thickest string to the thinnest.
Light and dark mode
Easy on the eyes on a bright stage or a dark room.
Free
Supported by one small banner ad. No subscription.
From the practice journal
All posts →I'm one of the developers behind this tuner, and I'm running tiny experiments with the guitar: what I'm practicing, where I learn it, and what I notice along the way.
Questions
Is My Pocket Guitar Tuner free?
Yes. The app is free to download and use. It shows a small banner ad, which is what keeps it free. There's no subscription or in-app purchase.
Does it work for classical guitar?
Yes. It's a chromatic tuner, so it hears any note from an acoustic, classical or electric guitar through your phone's microphone.
Is it on iPhone and Android?
Both. Download it from the App Store or Google Play.
Does it collect my data?
No. The app has no accounts and doesn't collect personal information. Ads are served by Google. Read the privacy policy.