# Infrasound Recorder > Mobile infrasound recorder for scientific exploration and ambient noise monitoring. (iPhone/iPad app by RedVox.) - Source: https://appshunter.io/ios/app/infrasound-recorder/id969566810 (this page in markdown: same URL + `.md`) - Developer: [RedVox](https://appshunter.io/developer/969566809) - Category: Utilities, Education - Price: Free with in-app purchases - Rating: 4.60/5 from 285 App Store ratings · 14 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 32 MB - Languages: American English - Released: 2015-03-09 - Data updated: 2026-06-10 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/infrasound-recorder/id969566810/reviews.md ## What is Infrasound Recorder? The RedVox Infrasound Recorder can capture sub-aural low frequency sound from volcanic eruptions, sonic booms, meteors, earthquakes, tsunamis, surf, and anything big that blows up. Be part of the world-wide infrasound exploration! Recording and streaming over wifi or cell starts as soon as you hit play. The main display shows the infrasonic pressure recorded with the internal microphone and (if available) barometer. Microphones plugged in through the data port or audio jack will override the internal microphone. Sound files are sent anonymously to the RedVox cloud server at redvox.io. Your app version and RedVox device ID is shown in the lower center of the front page, and can be changed in Settings. RedVox Recorder can record in the background to continuously monitor infrasound events and ambient noise. Although continued recording will consume more power, with the screen off it can run off the internal battery for many hours. We can also save the location of the device so that we can correctly map the infrasound that your device is recording and perform source localization. In the absence of cell or wifi, Recorder will save to memory and retransmit when communications are restored if the backfill setting is on. A record of the communication dB level is saved when available. You have access to all the files recorded in your device in a directory you choose during installation. Continued use of GPS running in the background can decrease battery life. PRIVACY -Access to the microphone is needed to run the app. -The free level only supports 80 and 800 Hz audio. -At 80 Hz, audio is heavily low-pass filtered below 32 Hz. There is no possibility of conversation or other identifiable human voicing being picked up. -At 800 Hz audio is heavily low-pass filtered below 320 Hz - in the bass guitar frequency range, and well below the primary speech range of 1-3 kHz. -Should you choose to use 8 kHz sampling or above at the Premium level, conversational audio could be recorded. The default privacy setting for the higher sample rates is private. -The RedVox Device ID is either a truncated version of the scrambled vendor ID or user-specified in the settings. It is not traceable to any account or personal information. ## Key features - Capture sub-aural low frequency sound - Record and stream over WiFi or cell - Background recording for continuous monitoring - Save device location for source localization - Anonymous data upload to cloud server - Local file storage ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Tier Monthly | $0.99 | per month | | Premium Tier Yearly | $0.99 | per year | ## Recent user reviews (10 of 14) All indexed reviews: https://appshunter.io/ios/app/infrasound-recorder/id969566810/reviews.md ### 2/5 — Used to love this App *2025-07-15, version 4.10* Not sure what has changed, but it doesn’t show the Labels ‘Speech’ & ‘animal walking’ etc that is picked up on recording… not sure which Graph I need to use but I’ve tried all of them .. I can’t see where the recordings are saved in the App to listen to them? I need to find out what frequencies are around me & for it to pick up ‘Speech’ through the Frequencies please! ### 5/5 — To the developer *2024-12-15* What happened fo the listen tool that registered what it was hearing ie “footsteps” “speech” “inside small room”? ### 2/5 — ??????? *2024-10-21* Absolutely no idea what I’m looking at or what it’s recording! Bars, graphs etc but of what? ### 3/5 — Sensor features deleted? *2023-04-29* I’ve had this app for years and for some reason, the sensors have all been removed except for barometer. It’s a neat app but the accelerometer, gyroscope and magnetometer sensors are gone, and despite having an account, “Data File Settings” and “Custom Settings” are gone too. Quite unusual to remove useful features and customizations, especially when it prevents you from using the report feature that’s promised after registering an account. Why were these options removed? ### 1/5 — Plays back 2 seconds of audio *2023-04-22, version 4.4* Difficult to use, only plays back 2 seconds of unusable audio. Bad UI/ UX ### 5/5 — Great app - produced exactly what I needed for Infrasound harassment *2023-03-04, version 4.3* This produced EXACTLY what I needed to prove that my neighbour, K Miller has been targeting my house with Infrasound. Thank You, and subscription is well worth it! ### 2/5 — Used to be useful... *2021-07-02, version 4.0.1* Before recent updates, this was the only free app that cleanly measured low frequency sounds with a spectrograph view. Now, it doesn’t seem to do anything. No spectrum view shows up, and lots of options are gone(maybe moved to premium version). I hope it can be updated to restore the lost functionality, and I’ll update this review if that happens. ### 1/5 — App wouldn’t let me register. It is of no help!! *2021-01-09* There’s no directions or explanation for your readings. Won’t let you register, and is unreliable. ### 1/5 — MALWARE HELP! *2020-06-12* this app is MALWARE I did not want it I cannot get rid if it. I have deleted it off my ipad ten times, and it downloaded an update and got back on here some how again just now APPLE REMOVE THIS HACKER GARBAGE!!! ### 5/5 — Red vo is great *2019-10-26* This app was great and accurate ## Frequently asked questions about Infrasound Recorder ### What is Infrasound Recorder? Infrasound Recorder is a mobile application designed to capture and stream very low-frequency sound waves, also known as infrasound. It allows users to record phenomena such as volcanic eruptions, sonic booms, meteors, earthquakes, and surf. The app also facilitates background recording for continuous monitoring and anonymously uploads recorded sound files to the RedVox cloud server for global exploration. ### What are the key features of Infrasound Recorder? Key features include the ability to capture sub-aural low-frequency sound, record and stream data over WiFi or cellular networks, and perform background recording for continuous monitoring. It also offers the option to save device location for accurate mapping and source localization of infrasound events. Recorded files are anonymously sent to the RedVox cloud server and can also be saved locally on the device. ### How does the app handle privacy? The app requires microphone access to function. The free version limits audio capture to 80 and 800 Hz, with significant low-pass filtering to prevent the recording of human speech. Higher sample rates, which could potentially capture conversational audio, are available at the Premium level and are set to private by default. Device IDs are anonymized and not traceable to personal information. ### What are the different levels of service and their costs? The application operates on a freemium model. The free level supports audio capture at 80 and 800 Hz with specific low-pass filtering. Higher sample rates, including those that could capture conversational audio, are available at a Premium level. The description implies that these premium features come at a cost, likely through in-app purchases or a subscription, though specific pricing details are not provided. ### What kind of sound events can this app record? This app is specifically designed to record infrasound, which are sounds with frequencies below the range of human hearing. This includes natural phenomena like volcanic eruptions, earthquakes, tsunamis, and surf, as well as man-made events such as sonic booms and large explosions. It can also be used for ambient noise monitoring. ## Version history (last 5 releases) ### 4.10 — 2024-11-12 -Updated with latest improvements and bug fixes -Redesigned UI and improved app efficiency ### 4.9 — 2023-09-16 New in this update: -Added spectrum display for accelerometer, magnetometer, and gyroscope -Bug fixes and stability improvements ### 4.8 — 2023-05-18 -New graphics views for Stockwell transform -Spectrograph and FFT graph updates and fixes -Stability improvements ### 4.7 — 2023-05-03 -Added FFT display in Stockwell mode -Bug fixes ### 4.6 — 2023-04-30 -Corrected spectrogram frequency scale in STFT mode -Bug fixes ## Apps similar to Infrasound Recorder | App | Rating | Price | Category | | --- | --- | --- | --- | | [Rule of Three Calculator](https://appshunter.io/ios/app/rule-of-three-calculator/id1185318300) | 2.3 (4) | Free | Utilities | | [Smart Vibration Meter・Detector](https://appshunter.io/ios/app/smart-vibration-meterdetector/id1121590218) | 4.1 (25) | Free | Utilities | | [Microwave Leak Detector](https://appshunter.io/ios/app/microwave-leak-detector/id1163814470) | 4.5 (11) | Free | Utilities | | [SSI Steel Design](https://appshunter.io/ios/app/ssi-steel-design/id1474838160) | 3.0 (1) | Free | Utilities | | [小灵龙App](https://appshunter.io/ios/app/app/id1221738240) | 1.0 (12) | Free | Utilities | | [Mosquitone Detector](https://appshunter.io/ios/app/mosquitone-detector/id1289567807) | 1.8 (12) | $6.99 | Utilities | --- *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 2026-06-10.*