# GPF Easy Diapason

> Diapason

Canonical page: [https://chrome-stats.com/d/id6760007666](https://chrome-stats.com/d/id6760007666)

## Overview

- **ID:** `id6760007666`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Gian Paolo Fontani
- **Category:** Music
- **Version:** 1.0
- **Last updated:** 2026-03-05
- **First published:** 2026-03-05
- **Size:** 279 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/gpf-easy-diapason/id6760007666)
- **Website:** [https://gianpaolofontani.net](https://gianpaolofontani.net/)
- **Privacy policy:** [https://www.iubenda.com/privacy-policy/22809070](https://www.iubenda.com/privacy-policy/22809070)

## Description

Simple iPhone tuning fork: tap to play, set frequency, fine tune in cents, choose waveform, and tune faster with a clean black and white design.

GPF Easy Diapason is a simple tuning fork app for iPhone.

It plays a continuous reference tone to help tune instruments and voices.
The interface is clean and minimal, with quick controls for sound setup.

Main features:
- Tap the 3D tuning fork to start or stop sound
- Reference frequency presets: A440, A432, A444, Baroque 415
- Base frequency control from 220 Hz to 880 Hz
- Fine tuning in cents (-50 to +50)
- Volume control
- Waveform selection: Sine, Square, Triangle, Saw
- Real time frequency display in Hz
- Version and build info in footer

Design:
- Black and white style
- Clear typography
- Focused single screen workflow for fast use

Technical notes:
- Built with SwiftUI
- Audio engine based on AVAudioEngine and AVAudioPlayerNode
- Automatic build number increment on each build

This app is made for musicians, students, choir practice, and anyone who needs a fast and reliable pitch reference on iPhone.

## Rankings

- #1,756,406 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6760007666)