# Diapason Audio Generator — Audio generation since 2010 > Versatile audio test tone generator with multiple signal types and source mixing. (iPhone/iPad app by Fabien Lefebvre.) - Source: https://appshunter.io/ios/app/diapason-audio-generator/id352091730 (this page in markdown: same URL + `.md`) - Developer: [Fabien Lefebvre](https://appshunter.io/developer/338004167) - Category: Utilities, Music - Price: $1.99 - Rating: 5.00/5 from 1 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 12.2 · 2 MB - Languages: American English - Released: 2010-01-26 - Data updated: 2026-08-15 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/diapason-audio-generator/id352091730/reviews.md ## What is Diapason Audio Generator? This App is a powerful test tone generator. Yet it is extremely simple to use. No other audio generator App is as complete as this one whatever its price ! You can combine (add) up to 4 independent sources and send the result to left and/or right speaker. There is a phase switch for each channel. Available test tone types are: sine wave, square, triangle, saw tooth, white noise, pink noise. As you can see on sample images, first source is very basic and thus very easy to use. Second source is more complex and allows sweeping of frequency for sine waves. Third source is quite similar to the previous one except that frequencies are aligned with a musical scale (reference is 440Hz). Fourth source is for narrow band noise. Rotating knobs are there to ease frequency selection. The display at bottom of first tab is a rough waveform viewer, to monitor the generated signal. The output RMS power of a channel is indicated. Clipping is indicated as well should it occur (sources are added). Any comment, any feedback ? There is a blog for this. Note that the built-in speaker cannot reproduce the highest and lowest frequencies (below 400 and above 11000Hz to give an idea). You will ear these frequencies only with a good headphone or HiFi system. ## Key features - Multiple test tone types (sine, square, triangle, sawtooth, noise) - Combine up to 4 independent audio sources - Phase switch for each speaker channel - Frequency sweeping and musical scale alignment - Narrow band noise generation - Waveform viewer - RMS power and clipping indication ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/diapason-audio-generator/id352091730/reviews.md ### 5/5 — zuverlässiger praktischer Tongenerator *2017-10-09* Den benutze ich schon seit den Anfangstagen des Appstore. Einfach zu benutzen. Wurde bisher immer weiter entwickelt, wenn nötig. Auch die anderen Apps des Entwicklers gefallen mir sehr gut. ### 5/5 — Another fantastic App! *2014-11-15* Works great! Bought this app just for fun after using the creators SPLnFFT noise level meter for an environmental noise study I did. Both apps are solid. ### 5/5 — Simple et efficace *2011-12-25* Sur iPod 4 cette appli fait ce qu'on lui demande et le fait bien : génération de signaux périodiques simples ou wobulés impeccable. ### 3/5 — Was good app; Won't work OS 5 or 5.01 V1.4 iPhone 4 *2011-12-01* I hope app designer can fix; this has been a great broadcast test tool till the OS change...Will do microphone levels into 600 Ohms. ### 1/5 — Doesnt work in IOS 5 *2011-11-20* Worked great till i upgraded to IOS5 ### 5/5 — Need manual! *2011-06-01* Love the app. But I don't see where the blog is? I can't figure out how to make source "B" be on right channel while source "A" is on left... ### 3/5 — OK up to 8 kHz *2010-04-29* Above 8 kHz the audio starts cutting out. Nothing above 9 kHz. ### 3/5 — Good generator but no manual *2010-04-23* I like the flexibility of this generator but it misses a manual. The "i" area does not reveal any information when touched, which is perhaps a bug. Once that it fixed and a good help / manual information shows I consider more stars. ### 5/5 — 5 Stars! *2010-02-24* Awesome app!! There are other tone generators out there, but this one is well worth the cost! Does everything you need! ## Frequently asked questions about Diapason Audio Generator ### What audio test tones can Diapason generate? Diapason can generate sine waves, square waves, triangle waves, sawtooth waves, white noise, and pink noise. It also offers narrow band noise for specific testing needs. ### How many audio sources can be combined in Diapason? You can combine up to 4 independent audio sources within Diapason. Each source can be sent to the left and/or right speaker, with individual phase switches for each channel. ### Does Diapason have ads? No, Diapason is ad-free. It is a paid application, and users can enjoy its full functionality without interruptions from advertisements. ### What is the price of Diapason? Diapason is available for a one-time purchase of $1.99. This grants you access to all its features without any further in-app purchases or subscriptions. ### What devices is Diapason compatible with? Diapason is compatible with iPhone, iPad, and iPod devices. It requires iOS 4+ and is optimized for various screen sizes. ### How often is Diapason updated? The latest version of Diapason is 2.8, last updated on November 2, 2025. Updates typically include feature enhancements and bug fixes to ensure reliable performance. ### What is the age rating for Diapason? Diapason has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content present. ### Can I monitor the generated audio signal with Diapason? Yes, Diapason includes a rough waveform viewer at the bottom of the first tab to monitor the generated signal. It also indicates the output RMS power and any clipping that occurs. ## Version history (last 5 releases) ### 2.8 — 2025-11-02 Display has been optimised for various screen sizes. ### 2.7 — 2022-02-25 Visual bug correction ### 2.6 — 2022-02-20 Re-compiled for latest iOS. Better handling of various screen sizes and shapes. ### 2.5 — 2019-12-29 Optimized for latest iPhones (11) and iOS (13) ### 2.4 — 2019-12-22 Fine tuned for latest iPhone styles ## Apps similar to Diapason Audio Generator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Keep Black](https://appshunter.io/ios/app/keep-black/id1569267680) | — | $1.99 | Utilities | | [Audio Tone Generator Plus](https://appshunter.io/ios/app/audio-tone-generator-plus/id1619042820) | — | $6.99 | Utilities | | [guitar tuner - Gt10](https://appshunter.io/ios/app/guitar-tuner-gt10/id1626441900) | 5.0 (6) | Free | Utilities | | [格式转换-视频音频提取格式转换](https://appshunter.io/ios/app/id1619027820) | — | Free | Utilities | | [MRS CONNECT for COMPACT-1500](https://appshunter.io/ios/app/mrs-connect-for-compact-1500/id1592414900) | — | Free | Utilities | | [Multitrack Editor: Audio Lab](https://appshunter.io/ios/app/multitrack-editor-audio-lab/id1616153020) | 3.7 (6) | Free | Utilities | ## More apps by Fabien Lefebvre - [Speaker Meter](https://appshunter.io/ios/app/speaker-meter/id338004164) - [SPLnFFT Noise Meter](https://appshunter.io/ios/app/splnfft-noise-meter/id355396114) - [logSPL](https://appshunter.io/ios/app/logspl/id491999427) - [AeroGoto](https://appshunter.io/ios/app/aerogoto/id542983237) - [BetonMix (concrete calculator)](https://appshunter.io/ios/app/betonmix-concrete-calculator/id872695788) All apps by Fabien Lefebvre: https://appshunter.io/developer/338004167 ## Related topics [diapason audio generator](https://appshunter.io/ios/topics/diapason-audio-generator) --- *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 2026-08-15.*