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Petralex Hearing aid

By IT ForYou

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Petralex ® is a hearing aid application based on iPhone or iPad, running same principles as conventional wearable hearing aid. Auto-adjusting to your personalized profile, completely invisible to anyone - use it with ordinary headset!

Using iPhone or iPad powerful hardware with our patented algorithms and user-friendly interface with fast profile selection brings maximum sound quality and comfort of use.

Benefits of Petralex ®:

- Easy to use - no special devices, no battery replacements or all-day wearing annoyance;

- Quick Setup for any sound environment;

- Increased sampling rate - 44.1 kHz, providing the best sound quality;

- Easy switching between device and headset microphones;

- Full acoustic gain up to 30 dB with a standard headset;

- Calculated minimum signal processing delay - just 6,3-15,7 ms (depending on the model);

- Use the built-in mic to catch sound from distant sources, i.e. in classroom, at theatre (or use it as a spy-ear!);

- Easy profile sync for all of your iOS devices with iCloud support;

- Setup and adjust the app without visiting a specialist.

- BT headset support (for processed sound playback only, sound is captured by device onboard mic).

You can compare the original and processed sound test phrases on our site Petralex

Petralex® Hearing Aid is absolutely free to use because of your support. If you find the app useful, please support developers with donation at

The Petralex® app is not approved as a medical device or software and cannot be used as a hearing aid with doctor`s prescription.
Audiometric test provided in the application can be used only for app adjustment. Testing results are not a substitute for professional audiology tests and cannot be considered as a basis for diagnosis.

Keep in touch:

What's New in Version 1.4.3

Мinor improvements


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Customer Reviews

Useful Software for esp Deaf Ppl

I'm not deaf but I've tested out this software on a deaf person who wasn't able to hear normally ( from long time). I've set the frequency as per his hearing mood, the result was far from his normal routine-hearing (deafness). During this he also notified me several hearings where we are used to for instance; birds singing, children noise playing outside etc. I could hear these too and I'm used to these. I've asked several questions and I've tested this by speaking from different distance and also in different moods.
In short as per his response the result was best.
I think software like this needs to be promoted for ppl who are in need.
"Giving is best communication".

Best amplifier app

It's really awesome how you can save profiles for different conditions in car, outside, the quiet of 3am or when the quiet is interrupted by the deaf ladies TV downstairs. Just take hearing test during what ever condition of ambient noise and your adjusted for best possible hearing for that exact condition. And it stays running never shuts off. Even when you move to work with another app. So yes you can spy just shut phone off and screens black but not the volume.


The hearing test works well, just like at the audiologist. And once you've created your profiles (quiet, or TV, etc) use the dial to increase the volume. Also be sure to use the slider on your screen to go from earphones to mic icons when you want to talk so your mic doesn't pick up your own speech

Petralex Hearing aid
View In iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Medical
  • Updated:
  • Version: 1.4.3
  • Size: 2.9 MB
  • Languages: English, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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