Audio File Analyzer
Spectrum anly / Transcription
Free · In‑App Purchases
(This app is developed in Japan. If it's displayed in "Japanese", please add "English" to "PREFERRED LANGUAGES" in [Settings]-[General]-[Language and Region].)
This app supports simultaneous display of the "audio waveform" and the FFT-based "amplitude spectrum" (frequency magnitude) for audio files on your device.
(FFT: Fast Fourier Transform)
You can check the frequency components around the current playback position while playing the file.
[Features]
- Add audio files from "Files" or songs from "Music" to a playlist within this app.
- Simultaneous display of audio waveform and a real-time spectrum linked to the playback position.
- Supports both portrait and landscape orientation.
- Channel display switching (Mix / L / R).
- Displays the peak level of the spectrum and its frequency.
- Supports zooming in the frequency direction of the spectrum.
- Pitch meter display.
- Supports transcription (iOS 26 ~).
The Pro version offers Ad-Free Viewing and High-Resolution Analysis (FFT size: 16384).
[Spectrum Display Settings]
- Frequency Axis: Linear, Log
- FFT Size: 1024, 2048, 4096, 8192, 16384 (* 16384 is available in the Pro version)
- Window Function: Hann, Hamm, Blkman, None
- Octave Analysis: FFT, 1/12, 1/6, 1/3, 1, Calc Method: Max, Ave
[Transcription screen] (* Available on iOS 26 or later.)
Transcribes speech in the selected audio file.
The results are divided into recognized speech segments and displayed in cells with their start times.
Tap a cell to move to that position.
Swipe left on a cell to copy its text.
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[Note]
This app can't add songs of the following formats.
- Songs from Apple Music, iCloud, iTunes Match
- Songs that are protected by digital copyright (DRM)
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Ratings & Reviews
- Added a feature to add song files from "Music."
- Added a feature to copy text by swiping on cells in the transcription screen.
- Updated the app’s compatibility requirements to iOS / iPadOS 18.0 or later.
The developer, Loop-Sessions.LLC., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Loop-Sessions.LLC.
- Size
- 6.3 MB
- Category
- Music
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Pro (Remove ads, High-Res analysis) $10.99
- Copyright
- © Loop-Sessions.LLC.