Audio Frequency Analyzer11.1 - App Store

"Audio Frequency Analyzer" is a powerful real-time audio analyzer (RTA) app for iPhone.

With its simple operation, you can easily measure and evaluate your sound environment.

This app measures the frequency response in 30 split band scale of 1/3 octave in real time. It can also display the FFT analysis results.

It supports calibration for 1/3-octave bands. By adjusting the characteristics to match not only the built-in microphone but also your external microphone, it achieves high measurement accuracy.

"Audio Frequency Analyzer" can be used for various applications, including sound room tuning, speaker settings, audio equipment testing, stage setup measurement, sound mixing environment evaluation and noise environment investigation.

Features:
- Frequency spectrum response measurement of 1/3 octave unit, 30 bands. (OCT)
- FFT Analyzer (FFT)
- Observation frequency range: 20 - 23000 Hz
- Logarithmic amplitude display.
- Touch-scroll function to adjust visible amplitude ranges.
- Display the measured value of 1/3 oct bands at OCT mode. (dB@OCT)
- Function to change the graph slope at FFT mode. (Slope): -3dB/oct (less than 1kHz), +3dB/oct (1kHz or higher)
- Peak hold function. (Hold)
- Average display function. (Avg): Time linear averaging. Fast-2.56sec, Slow-12.8 sec
- Display response control. (Fast/Slow)
- Reset of Measurement display position. (Scroll)
- Snapshot of Measurement display. (Snap)
- Calibration function in OCT mode. (Calibrate): 1/3 octave band offset and total offset setting.
- Supports built-in microphone, headset microphone, and external digital audio connection.

Note:
The first time you access your microphone and photos after installing the app, the iOS system will ask you for permission to access them. If you have not enabled this setting, the app will not be able to access them due to iOS system privacy restrictions. Please enable the access permission in the iOS setting "Settings > Privacy & Security > Photos or Microphone".

Please visit our iOS app support page for more information about this app.

Version History - Improved internal processing and performance. 11.1 Aug 8 - Improved internal processing and performance.
- Requires iOS 26.2 or later. 11.0 Feb 26 - Improved internal processing and performance.
- Requires iOS 18.7 or later. 10.1.1 12/18/2025 - Added Average display function.
- Changed UI design.
- Requires iOS 18.2 or later. 10.1 03/04/2025 - Renewed UI design.
- Requires iOS 18.1 or later. 10.0 11/26/2024 - Improved internal processing and performance.
- Requires iOS 16.6 or later. 9.0 10/03/2023 - Improved internal processing and performance.
- Renewed UI design.
- Requires iOS 15.0 or later. 8.0 11/29/2022 - Added a new function to change the slope in the FFT graph.
- Improved internal processing and performance.
- Changed UI design.
- Requires iOS15.0 or later. 7.0 12/23/2021 - Added the peak hold function for FFT analysis.
- Minor improvements.
- Requires iOS12.5 or later. 6.1 02/05/2021 - Minor bug fixes.
- Modified UI design.
- Requires iOS12.4 or later. 6.0 07/01/2020 - Improved UI.
- Requires iOS12.1 or later. 5.0 01/23/2019 - Minor bug fixes.
- Requires iOS11.3 or later. 4.3 05/21/2018 - Fixed some bugs. 4.2 03/14/2018 - Minor improvements in code.
- Requires iOS11.2 or later. 4.1 02/22/2018 - Added 1/3 octave band calibration function for each octave band.
- Update UI Design.
- Requires iOS11.2 or later.
- Optimize the code. 4.0 01/17/2018 - Requires iOS9.2 or later.
- Code optimization. 3.2 03/04/2016 - Improved a part of code
- Added the display response control function.
- Requires iOS8.4 or later 3.1 01/16/2016 - Added Peak HOLD function at 1/3OCT mode.
- Added Snapshot of Measurement display.
- Code optimization.
- Changed UI design.
- Support for iOS8.1 3.0 03/05/2015 - Improved low frequency response
- Added gain calibration function

Thank you for your useful feedback! If you enjoy using the app, please take a minute to leave a positive review. This really helps and keeps us motivating to work on new updates ! 2.1 07/04/2014 - Major Update! Changed UI design and App name.
- Add Function of Touch-Scroll to adjust visible amplitude ranges.
- Refactoring
- Correspond to iOS7.1 2.0 04/20/2014 - Updated for iOS7
- Adjustment of frequency
- Improvement of sensitivity
- Change of screen design 1.1 11/27/2013 1.0.0 08/12/2013