FNam FFT Spectrogram Analyzer
Utilities
Free · Designed for iPad. Not verified for macOS.
■ FNam FFT Spectrogram Analyzer
Engineers need tools that are ready to use — anytime, anywhere.
FNam FFT Spectrogram Analyzer turns your smartphone into a
professional audio analysis tool. Unlike typical sound meter apps,
it delivers advanced features like Dual File Comparison and CSV
Export for precise post-analysis
* completely free, no ads.
Real-time FFT & Spectrogram / All processing runs on-device /
No audio data uploaded externally.
[Video Guide - See it in action]
https://youtu.be/72SYLTG0l_8
■ NEW FEATURES
1. Octave Band View Mode
- Analyze sound levels by octave bands.
- Choose 1/1 or 1/3 octave band resolution in Settings.
2. Sound Event Logger
- Automatically logs sound events when the level exceeds a set threshold.
- Can save event WAV files and FNam JSON logs for later review.
- Includes a screensaver mode to reduce screen burn-in.
■ KEY FEATURES
1. Real-time Audio Analysis
• High-precision FFT (Fast Fourier Transform) Graph.
• Time Domain Waveform (Oscilloscope) view.
• Fluid Spectrogram for visualizing frequency changes over time.
2. Dual File Comparison (Exclusive Feature)
• Simultaneous loading of two WAV files for comparative analysis.
• Spectrum Overlay: Visually compare differences using color-coded traces (Blue vs. Magenta).
• Instant Calculation: Provides Arithmetic Mean and Mean Difference between signals.
3. Data Logging & Export
• Flexible Sampling Rates: Supports various rates (4000Hz, 8000Hz, 16000Hz, 22050Hz, 44100Hz).
• High-quality Recording: Audio is recorded and saved as WAV files, strictly matching the selected sampling rate.
• Raw Data Export: Exports raw PCM data to CSV format. The exported data maintains the exact sampling rate and duration, making it optimized for post-processing in Excel, MATLAB, or Python.
• File Management: Files are stored in the 'On My iPhone\FFT Analyzer' directory.
- WAV naming format: Date_Time_SampleRate_Channel.wav
ex) 20260219_164715_44100Hz_Mono.wav
- CSV naming format: Selected WAV file name_SampleRate_Duration(s).csv
ex) 20260219_164715_44100Hz_Mono_44100_5.2s.csv
4. Professional Configuration
• Window Functions: Selectable Rectangular, Hann, Hamming, and Blackman windows.
• Frequency Weighting: Supports A, B, C, and Z (Linear) standard weighting filters.
• Axis Control: Supports both Auto-scaling and Manual range settings (Hz / dB) for precise graph inspection.
• Calibration: Independent offset controls for FFT and Time Domain to ensure alignment with professional reference equipment.
• Max Peak Hold: Displays and holds the maximum amplitude values across the frequency spectrum.
• Octave Band View Mode: Visualizes frequency levels as octave band bars for easier band-by-band analysis.
■ TECHNICAL SPECIFICATIONS
• Signal Processing: Anti-aliasing filters are automatically applied during downsampling to ensure measurement accuracy.
• Sampling Rate: Supports standard rates up to 44.1kHz (device dependent).
• Standards: Implements IEC 61672 frequency-weighting formulas for A/B/C weighting calculations.
Note: This app implements IEC 61672 frequency-weighting formulas. Measurement discrepancies compared to professional equipment may occur due to the hardware frequency response limitations of the built-in smartphone microphone. For critical measurements, the use of a calibrated external microphone is recommended.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Improved readability in Dual File Comparison mode
- Enhanced Max Peak Hold functionality and added maximum peak information
- Added adjustable frequency and time domain graph heights in portrait mode
- Other readability improvements
- Fixed minor bugs
The developer, YEON SEOB KIM, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- YEON SEOB KIM
- Size
- 4.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Copyright
- © 2026 FNam