# ClapIR Acoustics Measurement > Measures room acoustics by analyzing clap sound recordings. (iPhone/iPad app by Stephen Tarzia.) - Source: https://appshunter.io/ios/app/clapir-acoustics-measurement/id521153051 (this page in markdown: same URL + `.md`) - Developer: [Stephen Tarzia](https://appshunter.io/developer/405396718) - Category: Utilities, Music - Price: Free - Rating: 3.80/5 from 12 App Store ratings · 8 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 1 MB - Languages: American English, German (Germany), European Spanish - Released: 2012-04-27 - Data updated: 2026-07-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/clapir-acoustics-measurement/id521153051/reviews.md ## What is ClapIR Acoustics Measurement? ClapIR is a tool for measuring the acoustic properties of a room. Simply start the app and clap your hands. ClapIR then analyzes the clap's recording to calculate the room's reverberation times and frequency response. It's acoustics engineering made easy! ClapIR is based on research done at Northwestern University by Prem Seetharaman and Stephen Tarzia. ## Key features - Room acoustics measurement - Reverberation time calculation - Frequency response analysis - Clap sound analysis - Acoustics engineering tool ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/clapir-acoustics-measurement/id521153051/reviews.md ### 4/5 — Good app *2021-03-07* Good app, but I wish there was a way to clear the display without multiple undoing. Other than that, it’s a great app that can help me find the best spot for audio recordings. ### 1/5 — Crap *2017-05-08* Developer needs to update this. It just plain doesn't work. ### 1/5 — With the last guy... *2016-09-14* I think maybe an iOS upgrade has rendered this App useless. It doesn't open the mic when the app starts. ### 5/5 — The tool I was looking for ! *2016-04-17* Thanks a lot for this simple but great tool. It does what it is supposed to do. You saved my day, thanks again. ### 1/5 — Nada. *2016-02-24* Is this app supposed to do something? ### 1/5 — ClapIR, does not work *2016-02-13, version 1.1* Downloded to iphone 6S, IOS 9. Reverb screen opens with a message on top "Please wait". Five seconds of audio are needed to compute the background level. Be Quiet". Message stays on screen for ever with all controls locked, there seems no way to cancel the messag.. The concept was good and just what we needed, but it is unusable. ### 5/5 — Great *2013-08-23, version 1.0* Good start point for looking into what is wrong with a room. Seems to accurately display an annoying little high pitch ring that happens in one of my rooms. Further down the line it would be great to be able to create impulse responses that could be used for convolution. Perhaps a de-reverb as well ;/) so that I can magically remove that little ring from all my old recordings now I identified it? Now you've got your work cut out - in the mean time, thanks for a great App. ### 5/5 — Really cool app! *2012-05-05* I liked it! Works well... FIRST TO RATE!! ## Frequently asked questions about ClapIR Acoustics Measurement ### How does ClapIR measure room acoustics? ClapIR measures room acoustics by having you clap your hands. The app then records and analyzes the clap's sound to calculate important acoustic properties like reverberation times and frequency response. ### What is the average user rating for ClapIR? ClapIR has an average rating of 3.8 stars, based on 12 user ratings. This indicates a generally positive but mixed reception among its users. ### Is ClapIR free to use? Yes, ClapIR is available for free. There are no costs associated with downloading or using its core features for measuring room acoustics. ### What devices is ClapIR compatible with? ClapIR is designed for Apple devices and is supported on iPhone and iPod touch. It requires iOS 4.0 or later. ### How often is ClapIR updated? The latest version of ClapIR, 1.5, was released on February 1, 2024. This suggests the app receives periodic updates to maintain compatibility and functionality. ### What is the age rating for ClapIR? ClapIR has an age rating of 4+, meaning it is suitable for children and adults. The app's content is considered appropriate for a wide audience. ### Does ClapIR have ads? No, ClapIR does not contain advertisements. As a free utility app, it provides an ad-free experience for users focused on acoustic measurements. ### Where did the research for ClapIR originate? The methodology behind ClapIR is based on research conducted at Northwestern University. This academic foundation lends credibility to its acoustic measurement capabilities. ## Version history (last 5 releases) ### 1.5 — 2024-02-01 Fixed a major bug in the signal processing. In the 1.4 version of the app, decibel values were and rt60 values were both off by factors of 2. ### 1.4 — 2022-10-01 Better noise rejection for more meaningful results. Export results using standard third-octave frequencies. ### 1.3 — 2017-09-13 This app has been updated by Apple to display the Apple Watch app icon. Fixed a bug causing the app to sometimes crash. ### 1.2 — 2017-09-08 Updated for iOS 10. Updated for Spanish and German language stores. ### 1.1 — 2013-09-30 Made the app compatible with iOS 7. Added Spanish and German language localizations. ## Apps similar to ClapIR Acoustics Measurement | App | Rating | Price | Category | | --- | --- | --- | --- | | [Reverb Time Analyzer](https://appshunter.io/ios/app/reverb-time-analyzer/id6497171936) | 1.0 (1) | $5.99 | Utilities | | [ClapReverb](https://appshunter.io/ios/app/clapreverb/id1407467855) | 5.0 (5) | Free | Utilities | | [BuzziSpace RT60](https://appshunter.io/ios/app/buzzispace-rt60/id1613535156) | 2.7 (3) | Free | Utilities | | [SoundMeter X](https://appshunter.io/ios/app/soundmeter-x/id1348050232) | 3.7 (43) | Free | Utilities | | [SignalScope X](https://appshunter.io/ios/app/signalscope-x/id1304775893) | 3.0 (21) | Free | Utilities | | [Room Acoustics+ RT60](https://appshunter.io/ios/app/room-acoustics-plus-rt60/id6760831395) | 1.0 (1) | Free | Utilities | ## More apps by Stephen Tarzia - [Batphone](https://appshunter.io/ios/app/batphone/id405396715) - [Badminton Footwork Trainer](https://appshunter.io/ios/app/badminton-footwork-trainer/id530904252) All apps by Stephen Tarzia: https://appshunter.io/developer/405396718 ## Related topics [clapir acoustics measurement](https://appshunter.io/ios/topics/clapir-acoustics-measurement) · [acoustic](https://appshunter.io/ios/topics/acoustic) --- *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 2026-07-04.*