Open AppCo app #10

Changes Requested

Open Tuner needs changes before Apple can approve it.

Guitar, 12-string, uke, banjo and bass. 28 tunings, all included.

Address Apple's review feedback for version 1.0.0, then resubmit.

Status checked 2026-10-16.

Follow the review status

The actual app

What it looks like.

Open Tuner on guitar, low E nearly in tune, with What's different
Tap a peg. Pluck. Tune.
Banjo string two semitones high: Too high. Loosen, don't tighten.
Sharp? It says loosen.
12-string headstock with twelve pegs, octave string selected
12-string, one string at a time.

28-second device check

On a real iPhone.

On a real iPhone, with sound: launch from the Home Screen, play E2, read the low E string live, hold Play to repeat the note, switch strings, then the 12-string and bass.

Why this app exists

What people complained about, and what we changed.

We read 16,437 App Store reviews of 18 tuner apps. These complaints kept coming up.

“it broke one of my strings becuase it kept telling me to tune up”

GuitarTuna on the App Store

What Open Tuner does instead

Shows the note it hears, says loosen when you're sharp, and never says tighten when it isn't sure.

“any alternative like drop D or half step down will require a subscription”

GuitarTuna on the App Store

What Open Tuner does instead

All 28 tunings across five instruments are included.

“pop-up ads that cover the whole screen each time you open the app”

Tuner T1 on the App Store

What Open Tuner does instead

No ads.

“automatically moves to the next one. You’re constantly selecting the string you want”

Guitar Tuner - Simply Tune on the App Store

What Open Tuner does instead

You pick the string. Auto never moves on by itself.

“this app has no option for 12-string guitars”

Fender Tune on the App Store

What Open Tuner does instead

12-string, each pair tuned one string at a time.

Follow the review status