# Tuning Fork A440 - Diapason — Tuning Fork & Reference Tones > Tuning Fork & Reference Tones (iPhone/iPad app by Walter Zanette.) - Source: https://appshunter.io/ios/app/tuning-fork-a440-diapason/id6802367902 (this page in markdown: same URL + `.md`) - Developer: [Walter Zanette](https://appshunter.io/developer/6801439552) - Category: Music, Utilities - Price: Free - Age rating: 4+ - Requires: iOS 15.0 · 38 MB - Languages: American English, French (France), German (Germany), Italian, European Spanish - Released: 2026-08-24 - Data updated: 2026-10-02 ## What is Tuning Fork A440? Diapason Plus is a simple and reliable tuning fork app designed for musicians, choir conductors, music teachers, and music enthusiasts. Get quick and accurate access to the most commonly used reference frequencies — 440 Hz, 432 Hz, and 415 Hz — or choose a custom frequency to suit your needs. SIMPLE, FAST AND PRECISE Whether you're tuning an instrument, setting the pitch for a choir, teaching a music lesson, or rehearsing, Diapason Plus gives you an immediate and stable reference tone. • Easy to use: select a preset frequency with a tap or choose your own custom value. • Quick access: play your reference tone instantly, without unnecessary steps. • Precise reference tones: designed for musicians, teachers, conductors, and enthusiasts. • Clean interface: a minimal design that keeps the focus on your music. REFERENCE FREQUENCIES 440 Hz — The standard A The internationally recognized reference pitch for modern instrument tuning. A reliable choice for rehearsals, performances, lessons, and everyday practice. 432 Hz — An alternative tuning Some musicians choose 432 Hz as an alternative to the standard 440 Hz, appreciating its slightly lower pitch and different tonal character. 415 Hz — The baroque choice Approximately a semitone below 440 Hz, 415 Hz is commonly used in historically informed performances of baroque and early music. It is particularly useful when working with period instruments and ensembles. CUSTOM FREQUENCY Need a different reference pitch? Diapason Plus lets you select a custom frequency within the available range, giving you greater flexibility for different instruments and musical contexts. EXTRA FEATURES • Shake to Play: shake your device to start the tuning fork instantly, without pressing a button. Availability depends on your device's motion sensors. • Keep Screen On: prevent the display from turning off while you're using the app. • Tap to Stop: tap the tuning fork while it's playing to stop the sound immediately. YOUR REFERENCE TONE, ALWAYS AT HAND From everyday instrument tuning to choir rehearsals, music lessons, baroque performances, and personal practice, Diapason Plus gives you a simple and convenient reference tone whenever you need it. Choose your frequency, play the tone, and focus on your music. Note: Sound reproduction and the effective frequency range may vary depending on the audio hardware and capabilities of your device. ## Version history (last 2 releases) ### 1.10.3 — 2026-08-25 Many bug fixes and better audio quality ### 1.10.2 — 2026-08-24 No release notes. ## Apps similar to Tuning Fork A440 | App | Rating | Price | Category | | --- | --- | --- | --- | | [iDiapason](https://appshunter.io/ios/app/idiapason/id325550985) | 1.0 (1) | Free | Music | | [Endless A-440](https://appshunter.io/ios/app/endless-a-440/id971330737) | 4.5 (2) | Free | Music | | [GPF Easy Diapason](https://appshunter.io/ios/app/gpf-easy-diapason/id6760007666) | — | Free | Music | | [Chromatic Tuner - BA2](https://appshunter.io/ios/app/chromatic-tuner-ba2/id6772590481) | — | Free | Music | | [A440 Tuner](https://appshunter.io/ios/app/a440-tuner/id304862860) | 2.9 (8) | Free | Music | | [Universal Instrument Tuner](https://appshunter.io/ios/app/universal-instrument-tuner/id6760537949) | — | Free | Music | ## More apps by Walter Zanette - [WhatSat: ISS Satellite Tracker](https://appshunter.io/ios/app/whatsat-iss-satellite-tracker/id6802009820) All apps by Walter Zanette: https://appshunter.io/developer/6801439552 ## Related topics [the tuning fork lite](https://appshunter.io/ios/topics/the-tuning-fork-lite) · [skullcandy earbuds audio tuning tool](https://appshunter.io/ios/topics/skullcandy-earbuds-audio-tuning-tool) · [diapason](https://appshunter.io/ios/topics/diapason) · [tuning fork](https://appshunter.io/ios/topics/tuning-fork) · [tuning fork pro](https://appshunter.io/ios/topics/tuning-fork-pro) · [a440](https://appshunter.io/ios/topics/a440) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-02.*