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Dec [{(:no_ai:)}]dec23k@mastodon.ie
Jun 19, 2026, 11:21 AM
@sebz @mlanger @tomsart
In 2018, I installed an app called Infrasound Detector on what is now a very old (but still working) Android tablet. This tablet no longer gets OS updates (and it's not supported by Lineage / Replicant / postmarketOS) but the apps that are still on it all work offline.
I just tested the app now, and it still works.
https://play.google.com/store/apps/details?id=com.microcadsystems.serge.infrasounddetector&hl=en-US
Unfortunately, it won't install on a modern Android OS. The developer last updated it in 2018.
I'll check for free alternatives.
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Replies

Dec [{(:no_ai:)}]dec23k@mastodon.ie
Jun 19, 2026, 11:34 AM
@sebz @mlanger @tomsart
After a quick look on the Play Store, all the apps that I can find are pay-only, freemium, and cloud or AI powered.
(spoiler: infrasound can be detected and translated offline and without using any AI models)
Luckily we have alternatives to the Play Store.
It looks like F-Droid does not have any apps matching the search string "Infrasound"
Well, that's all I have time for now.
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Maria Langermlanger@mastodon.world
Jun 19, 2026, 1:35 PM
@dec23k @sebz @tomsart I'm in the iOS universe, but I'll look for something in the Apple Store. Infrasound sound is what I suspect.
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Dec [{(:no_ai:)}]dec23k@mastodon.ie
Jun 19, 2026, 3:05 PM
@mlanger @sebz @tomsart
So far in your thread, the most plausible explanations are gas turbines or energy-storage flywheels.
(not that that info will help to cut down the noise).
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Maria Langermlanger@mastodon.world
Jun 19, 2026, 3:26 PM
@dec23k @sebz @tomsart It's definitely very low frequency.
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sebzsebz@chaos.social
Jun 19, 2026, 4:18 PM
@mlanger @dec23k @tomsart
You might just want to try to record the sound as usual with your tablet and then load it into audacity or similar software (i think even vlc should work)
Then you just modify the pitch to +100% (+ 1 octave) which should make the sound audible for others too.
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HierarchyHierarchy@mastodon.social
Jun 26, 2026, 5:50 AM
@sebz @mlanger @dec23k @tomsart if you manage to record the sound, please share it with us if possible
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HierarchyHierarchy@mastodon.social
Jun 26, 2026, 5:53 AM
@dec23k @mlanger @sebz @tomsart are the energy storage the wheels that push up the cylinders for energy storing? Also is it expected from the gas powered turbines that tehy can go below 20hz? I dont know if they act similar way than the emergency gas turbines that the energy grid uses when they run out? Those are not low hw I believe
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