# FNam FFT Spectrogram Analyzer

> FNam FFT Spectrogram Analyzer (iPhone/iPad app by YEON SEOB KIM.)

- Source: https://appshunter.io/ios/app/fnam-fft-spectrogram-analyzer/id6759438376 (this page in markdown: same URL + `.md`)
- Developer: [YEON SEOB KIM](https://appshunter.io/developer/1878586254)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 12+
- Requires: iOS 26.0 · 5 MB
- Languages: American English
- Released: 2026-02-23
- Data updated: 2026-08-20
- User reviews in markdown: https://appshunter.io/ios/app/fnam-fft-spectrogram-analyzer/id6759438376/reviews.md

## What is FNam FFT Spectrogram Analyzer?

■ 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.


## Version history (last 5 releases)

### 2.2 — 2026-08-19

- Added the new Sound Event Logger feature
- Added the new Octave View feature
- Improved text visibility in Spectrogram mode

### 2.1 — 2026-06-24

- Added bilinear interpolation smoothing for the spectrogram display

### 2.0 — 2026-06-05

- Fixed an issue where the screen could lock while the app was in use
- Added an anonymous feedback link in settings
- Improved file load/save and control logic stability
- Fixed minor bugs

### 1.9 — 2026-05-18

- Fixed minor bugs
- Added Landscape mode for wider graph view
- Added 'FNam Armory' (Experimental sandbox for advanced tools)

### 1.8 — 2026-05-15

- Fixed an issue where user calibration presets were deleted when resetting settings to default.

## Apps similar to FNam FFT Spectrogram Analyzer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [N-Signal / FFT Sound Analyzer](https://appshunter.io/ios/app/n-signal-fft-sound-analyzer/id6755102833) | — | Free | Utilities |
| [iHarmonizer](https://appshunter.io/ios/app/iharmonizer/id488536254) | 5.0 (1) | Free | Utilities |
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| [SpectralScan Audio Analyzer](https://appshunter.io/ios/app/spectralscan-audio-analyzer/id6762024331) | 5.0 (5) | Free | Utilities |
| [o46scope](https://appshunter.io/ios/app/o46scope/id6754371407) | — | Free | Utilities |
| [SimpleFFT](https://appshunter.io/ios/app/simplefft/id1239257017) | — | Free | Utilities |

## More apps by YEON SEOB KIM

- [FNam Frequency,Noise Generator](https://appshunter.io/ios/app/fnam-frequencynoise-generator/id6763213081)

All apps by YEON SEOB KIM: https://appshunter.io/developer/1878586254

## Related topics

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

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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 2026-08-20.*