Support

The Pro unlock is a one-time purchase tied to your Apple ID, so it follows you to a new phone for free.

1. Make sure you're signed in with the same Apple ID you bought it with.
2. Open GuitarDoc → Settings (gear icon, top right of Home).
3. Tap Restore Purchases.

The Restore button also appears on the unlock screen itself. If it doesn't come back, email me with roughly when you bought it and I'll help sort it out.

The camera tool calibrates against your own frets, so a careful calibration is what makes the measurement accurate:

• Keep the phone at the same distance for the calibration freeze and the measurement freeze — this is the single biggest factor.
• Hold the phone square-on to the side of the neck, not at an angle.
• Use good, even light — daylight or a bench lamp. Avoid heavy shadows across the strings.
• Pinch to zoom on the frozen frame before placing your markers.
• Brace your elbows or rest the phone on something if you can.

Sanity check: typical electric guitar action at the 12th fret is around 1.2–2.5 mm. If a reading looks wildly outside that, recalibrate and measure again.

The setup workshop and measurement specs cover the two big families:

• Strat-style — bolt-on Fender-type guitars (Strat, Tele, and similar superstrats) with individual saddle height adjustment.
• Les Paul-style — set-neck Gibson-type guitars with a Tune-o-matic bridge and stopbar tailpiece.

If your guitar is something else (acoustic, bass, floating trem with locking nut), the strobe tuner and buzz troubleshooter still work great (and Pro's guided intonation) — but the factory spec targets in the workshop are written for the two families above.

No — GuitarDoc is 100% offline. The only time a connection is used is when Apple processes the Pro purchase or a restore. Everything else works in a shed with no signal.

Microphone: the tuner listens to your guitar to detect pitch. Audio is processed on the phone and never recorded or uploaded.

Camera: the measurement tool looks at your strings and frets. Frames are processed on the phone and never leave it. See the privacy policy — the short version is: the app collects nothing.

Brilliant — email support@guitardoc.app with what happened (a screenshot helps a lot) and your iPhone model. GuitarDoc is built by one guitar player, and reports like yours directly shape the next update.