GPF Easy Diapason

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.