# Ultrasonic Analyzer

> Real-time spectrum, spectrogram, oscilloscope, and RTA analyzer for ultrasounds. (iPhone/iPad app by DEXUS Pawel Krzywdzinski.)

- Source: https://appshunter.io/ios/app/ultrasonic-analyzer/id851069926 (this page in markdown: same URL + `.md`)
- Developer: [DEXUS Pawel Krzywdzinski](https://appshunter.io/developer/377798036)
- Category: Music, Utilities
- Price: $19.99 (on sale, was $29.99)
- Rating: 3.90/5 from 34 App Store ratings · 28 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.4 · 2 MB
- Languages: American English
- Released: 2014-04-25
- Data updated: 2026-09-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ultrasonic-analyzer/id851069926/reviews.md

## What is Ultrasonic Analyzer?

Ultrasonic Analyzer is a real-time spectrum, spectrogram, oscilloscope, and octave RTA analyzer for your iPhone or iPad. It provides a visual representation of ultrasounds using a sampling rate of up to 384kHz**. You can listen to transposed ultrasounds* and analyze them in real time. For sounds that are normally inaudible, a slowed-down playback option is also available.  

Ultrasonic Analyzer can be used to analyze the calls of various animals (e.g., bats, dolphins), measure the frequency response of high-end audio equipment, or evaluate ultrasonic sensors. Additionally, it allows you to analyze short imported audio files within a spectrogram context.  

Features  

- Sampling rates: 44.1kHz, 48kHz, 96kHz, 192kHz, 200kHz, 250kHz, 384kHz**  
- Real-time transposed ultrasound listening during recording*
- Spectrogram analyzer: Color and black & white modes  
- Spectrum analyzer  
- Oscilloscope (full FFT window size)  
- Octave RTA analyzer: Bands – full, 1/3, 1/6, 1/12 (RMS values)  
- Max/min Octave RTA values  
- dBFS Meter  
- Fast real-time response  
- Adjustable spectrogram frequency resolution  
- Configurable time interval between FFT computations, with values as low as 1ms or even lower  
- Fast Fourier Transform (FFT)  
- FFT window sizes: 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536  
- Recording trigger: Automatically triggers based on specified frequency bands  
- Zoom and pan capabilities for all charts  
- Measurement tools available in all charts  
- Playback analysis
- Transposition during playback  
- Slow-down playback: Transpose octaves down for easier analysis  
- Picture-in-Picture (PIP) mode: Allows simultaneous spectrogram analysis with a secondary chart (Octave RTA, Spectrum, or Oscilloscope)  
- Audio input support: Built-in microphone, external microphone (via USB camera adapter or iPhone/iPad dock connector – Core Audio compliant devices)  
- Sharing options: Share charts and audio recordings via email, social networks, or clipboard  
- Exporting capabilities: Save audio recordings (WAV) and image charts (PNG) to iOS Document Browser
- Audio file import: Load short audio files from other apps or the iOS Document Browser  
- Supported audio formats: WAV, CAF, AAC, MP3  
- Automatic sample rate conversion for imported files  
- Frequency scale options: Linear and logarithmic  
- Amplitude scale options: Linear and logarithmic (dBFS)  
- dBFS Meter weighting: dBZ (linear)  
- Adjustable spectrogram length (dependent on resolution settings)  

Tested with (via USB adapter):  

- Dodotronic Ultramic200K, Ultramic250K, Ultramic384K  
- Pettersson M500-384  
- Avisoft UltraSoundGate 116Un  

Make sure you are using the latest iOS update.  

*Requires an external microphone with ultrasonic capabilities connected via a USB adapter.  
**Real-time analysis at a 96kHz sample rate or higher is only possible with an external USB microphone. Alternatively, you can import files recorded on an external device for non-real-time analysis.

## Key features

- Real-time spectrum analysis
- Spectrogram and oscilloscope views
- Octave RTA analyzer
- Transposed ultrasound listening
- Slowed-down playback
- High sampling rates up to 384kHz
- Zoom and pan capabilities

## Chart rankings

- #200 in Top Paid · Music (US App Store)

## Recent user reviews (10 of 28)

All indexed reviews: https://appshunter.io/ios/app/ultrasonic-analyzer/id851069926/reviews.md

### 5/5 — Bat-Detection

*2025-04-25*

Good App in combination with audio moth ultrasonic microphone. Makes the bat calls perfectly visible and gives the possibility to save the records for later analysis.

### 5/5 — OUTSTANDING!! Laboratory quality spectrum analysis!

*2025-02-02*

I am an Electronics and Optical Technologist and have used professional laboratory instrumentation for over 30 years and
this app brings true realtime audio spectral analysis with an optional embedded realtime spectral display in a picture-in-picture window on the main display. The quality and accuracy comes from very high-speed signal recording and analysis, and includes an ultrasonic audio transposing mode to make this app function like a professional instrument ( nevermind the convenience and portability of being able to carry a spectrum analyser in your shirt pocket or on your ipad! ) THANKYOU for the Bluetooth update!! (i’m using my new TinySA Ultra to scan RF today!!)

Outstanding app!   KUDOS to Pawel!!

### 1/5 — $20 for *this*?

*2025-01-02*

This app is pretty amateurish, not even supporting Bluetooth headphones on iPhone. It's 2025. When was the last time you saw an app that could only output over wired headphones? I didn't realize that was even a possibility. It's like the developer stopped trying back around 2018, and never updated it further.

The app's readouts also mix dB (SPL) and dBFS freely, even though there is no way to get SPL without first calibrating the system. What's up with that?

The whole thing just feels very "beta version written by a student in their dorm room." This is the single most expensive single-purchase app I have ever encountered. I probably wouldn't bother to keep it even if it were free.

**Developer response:** The latest version now includes support for Bluetooth headphones. I hope this enhances your experience with the app.

### 5/5 — Counter surveillance uses

*2024-09-05*

Anybody who’s the victim of any kind of surveillance abuse or  voyeuristic abuse in general, can use this app to pick up on a nearly imperceptible frequency around 14,000 kHz. The untrained ear you wouldn’t be able to hear this frequency but it is the result of using wave generated surveillance systems such as the CTX 4000 or the national security agencies tempest program that uses subtle amounts of non-ionizing radiation directed at the building that the target is in to pick up on all the electronic and more importantly biometric information similar to what you get from the xavor1000 system. 
Simply run the recording through a program like audacity or adobe audition and increase the decibel rate what’s you hone in on it with the apps spectrum analyzer.

### 1/5 — No headphone monitoring support

*2023-11-07*

I was keen to use this app with my Ultramic 384 USB mic and AirPods Pro for real-time repitched monitoring of bat calls, as described in the docs. However, the headphone monitoring crashes after less than a minute, and requires a reboot to resolve. The app author stated that Bluetooth headphones are not supported, blaming the issue on Apple having retired support for wired headphones. However, this was 7 years ago, which should give ample time to update the app. This means that real-time monitoring of USB mics is effectively not supported on present-day iOS devices.

**Developer response:** The latest version now includes support for Bluetooth headphones. I hope this enhances your experience with the app.

### 5/5 — App idea

*2023-10-19*

Great app. It would be really cool if it were updated to give us visuals of infrasound like some other apps can in the App Store. The technology is available now so it shouldn’t be hard for the developer to update the app for that. There’s another app that can detect and give you visuals for all the way down to 1hz.

### 2/5 — No Instructions

*2023-03-20*

Trying to capture my neighbor blasting us with ultrasonic sound but there are no instructions with this app on how to utilize this.

### 1/5 — No ultrasound

*2022-03-26*

Great app, one problem, Apple audio doesn’t go above 22kc. Have a solution let me know.

**Developer response:** For real-time ultrasonic analysis, use an external microphone with ultrasonic capabilities through a USB camera adapter or through the iPhone/iPad dock connector.

### 3/5 — 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨

*2021-10-07*

This is the best analyzer on the App Store but please Update it

### 5/5 — Works well, great UI, helped me eliminate a cause of a problem

*2021-07-27*

How can the microphone on an iphone sample at such absurdly high rates?  I don't know, but it seems to work, and this app has helped me eliminate ultrasound pollution as a cause of headaches that my wife's Macbook air m1 is causing us.  The UI is FANTASTIC.  The author clearly knows a thing or two about UI design!

## Frequently asked questions about Ultrasonic Analyzer

### What does the Ultrasonic Analyzer app do?

The Ultrasonic Analyzer app provides real-time visual analysis of sound frequencies, including spectrum, spectrogram, oscilloscope, and octave RTA displays. It allows users to analyze ultrasounds, listen to transposed sounds, and even slow down playback for inaudible frequencies.

### What are the key features of the Ultrasonic Analyzer app?

Key features include real-time spectrum, spectrogram, and oscilloscope analysis, an octave RTA analyzer with various band options, transposed ultrasound listening, slowed-down playback, high sampling rates up to 384kHz, and zoom/pan capabilities on all charts. It also supports audio file import and sharing options.

### How much does the Ultrasonic Analyzer app cost?

The application is a paid app. There are no in-app purchases or advertisements mentioned in the provided description.

### What devices is the Ultrasonic Analyzer app compatible with?

The app is designed for iPhone and iPad. For real-time analysis at 96kHz or higher sample rates, an external USB microphone is required. It supports Core Audio compliant devices for audio input.

### What are some common use cases for the Ultrasonic Analyzer app?

Common use cases include analyzing animal calls (like bats or dolphins), measuring the frequency response of high-end audio equipment, evaluating ultrasonic sensors, and analyzing short imported audio files within a spectrogram context.

## Version history (last 5 releases)

### 2.8 — 2025-02-02

- Added support for Bluetooth headphones.
- Small fixes.

### 2.7 — 2020-03-16

- iOS 13 Dark Mode
- bug fixes

### 2.6 — 2017-09-23

- iOS 11, iPhone X ready
- Import and export audio recordings to and from the iOS 11 Document Browser (supports iCloud)

### 2.5 — 2016-09-21

What's new
- iOS 10 support 
- musical note names

### 2.4.3 — 2016-05-11

- fixed import issues

## Apps similar to Ultrasonic Analyzer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [Audio Spectrum Analyzer dB RTA](https://appshunter.io/ios/app/audio-spectrum-analyzer-db-rta/id1281873790) | 4.5 (3,042) | Free | Music |
| [Audio Spectrum Analyzer Pro](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806) | 4.4 (238) | Free | Music |
| [Spectrum Analyzer: Spectrogram](https://appshunter.io/ios/app/spectrum-analyzer-spectrogram/id981810895) | 4.2 (195) | Free | Music |
| [Audio / Spectrum Analyzer](https://appshunter.io/ios/app/audio-spectrum-analyzer/id1508848574) | 4.6 (1,025) | Free | Music |
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## More apps by DEXUS Pawel Krzywdzinski

- [Audio Analyzer](https://appshunter.io/ios/app/audio-analyzer/id681184981)
- [Audio RTA](https://appshunter.io/ios/app/audio-rta/id861969994)

All apps by DEXUS Pawel Krzywdzinski: https://appshunter.io/developer/377798036

## Related topics

[ultrasonic analyzer](https://appshunter.io/ios/topics/ultrasonic-analyzer) · [ultrasonic](https://appshunter.io/ios/topics/ultrasonic)

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*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 2026-09-01.*