Simple, effective tuning, without fuss.

A single tap is all it takes to produce a tone.

But save yourself the hassle of opening the App - set up a Siri Shortcut, directly within the App, and you're done.

Well, nearly ...

Why not take convenience to the next level, by adding the Shortcut to the Home Screen, the Dock, and the Shortcuts Widget?

Now you're really set!

Need to tune to A–443? No problem, the frequency is adjustable (435–445 Hz).

A–440 is also a great fit for Slide Over on an iPad, where the ability to start and stop the tone at will proves its usefulness.

The 14-day Trial is activated via a no-cost, obligation-free purchase in the App Store. After the trial expires the App is completely disabled until you decide to purchase a license.

What’s New

Version 2.5.5

• UI improvements
• Bug fixes.

Ratings and Reviews

4.6 out of 5
141 Ratings

141 Ratings

puente de paja ,

Finally a tuner for real musicians

This app is exactly what I’ve been looking for! No ugly sustained tone; no superfluous pitch selection or—worse yet—insulting frequency measurement. Just an adjustable A4 with a well-measured decay. Love it!

SpaceCoastKaper ,

This app saved me today.

I'm a professional piano tuner. Today I forgot my tuning fork. I got out my iphone searched for A440 and downloaded this app. It worked perfectly and allowed me to do the tuning work.

Unreal Yorik ,

Don't annoy me if I paid for your software

I paid money for the app. In return I'm harassed repeatedly to give a review. If you want one here you go.

Developer Response ,


The cause of this annoyance has been addressed in the latest update to version 2.5.3.

Please accept my apologies.


Paul Richardson
13.6 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, German

Age Rating
In-App Purchases
  1. 14-day Trial
  2. A–440 Standard $0.99
  3. A–440 Premium $1.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

  • Siri

    Get things done within this app using just your voice.

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