A440 Tuning Fork is a free iPhone app developed by Paul Richardson. It falls under the category of Multimedia and specifically Music & Radio. This app offers a simple and effective way to tune your instruments without any hassle. With just a single tap, you can produce a tone, making it incredibly convenient to use.

One of the standout features of A440 Tuning Fork is the ability to set up a Siri Shortcut directly within the app. This means you can easily access the tuning functionality without even opening the app. Additionally, you can add the Siri Shortcut to your Home Screen, Dock, and Shortcuts Widget, taking convenience to the next level.

The app also allows you to adjust the frequency from 435 to 445 Hz, making it suitable for tuning to A–443 if needed. Furthermore, A–440 is particularly useful for Slide Over on an iPad, where you can start and stop the tone at will.

Please note that the app offers a 14-day trial, which can be activated through a no-cost, obligation-free purchase in the App Store. Once the trial expires, the app will be completely disabled until you decide to purchase a license.