Infrasound Recorder

In-app purchases
77 reviews
Content rating
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About this app

The RedVox Infrasound Recorder captures 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

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.

-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.
Updated on
May 3, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 4 others
Data is encrypted in transit
You can request that data be deleted
77 reviews
S Kang
October 27, 2021
Couldn't even use. It will only work if you give the app location access all the time not just while in use. They do not need my location to record a sound. Then it requires full access to the entire storage of my phone not just their folder. Deleted do to shady and suspicious permission requirements to record a sound.
13 people found this review helpful
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November 8, 2021
Hello, the where (location) and when (time) of a recording are essential for basic science. Your comment is puzzling; the app asks the user for access to a designated directory to save the files so you can verify all collected data is above board. The OS permission and app data are more transparent than ever thanks to Android's maturation.
November 4, 2020
I have allowed all permissions, only saw in another review you replied to, you mentioned that the recording has to be at least 1 minute long to build a save location.. So I recorded for 1m20s..Now I see the file in the app and in my file explorer, but it won't play.... Can you tell me how I do that, so I can hear what I've recorded? I'm really curious to get what I'm hearing on file, cause I seem to be the only one who can hear it
8 people found this review helpful
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October 15, 2021
Version 3.3.14 and above can ensonify infrasound (80 and 800 Hz, Free tier) and reproduce audio sampled at 8k (Premium tier).
A Google user
June 29, 2019
Detects sound just fine, the graphs move, but it does not save any type of file whatsoever. Completely worthless, and yes I looked in the RDVX folder, it's completely empty.
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July 11, 2019
Cannot reproduce. Please use latest app and internal smartphone file manager to view (see previous comments). Need to give app at least one minute (one file) to populate RDVX directory.

What's new

-Free tier records mic infrasound and low-frequency audio at 80 Hz or 800 Hz, and barometer sensor when available
-Location is needed to do the Science
-On-board machine learning on higher tiers
-Annotation display
-Improved playback display