# FNam FFT Spectrogram Analyzer > Real-time FFT, Spectrogram, Sound Level, Dual Audio Comparison & CSV Data Logger Canonical page: [https://chrome-stats.com/d/com.fnam.audioanalyzerv01](https://chrome-stats.com/d/com.fnam.audioanalyzerv01) ## Overview - **ID:** `com.fnam.audioanalyzerv01` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** FormulaNam - **Category:** TOOLS - **Downloads:** 2,770 - **Version:** v3.5 - **Last updated:** 2026-07-22 - **First published:** 2025-12-04 - **Publisher country:** KR - **Size:** 5.83 MB - **Data as of:** 2026-09-08 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.fnam.audioanalyzerv01) - **Website:** [https://sites.google.com/view/formulanam](https://sites.google.com/view/formulanam) - **Privacy policy:** [https://sites.google.com/view/fnam-audioanalyzer-policy](https://sites.google.com/view/fnam-audioanalyzer-policy) ## Description ■ 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 (core features).
Real-time FFT & Spectrogram / All processing runs on-device /
No audio data uploaded externally.

■ 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.

3. Frequency Response Preview (requires FNam Frequency Noise Generator)
- Measures acoustic frequency response over WiFi TCP.
- Requires FNam Frequency Noise Generator.

■ Turn your smartphone into a professional audio analysis tool.

[Video Guide - See it in action]
https://youtu.be/72SYLTG0l_8

FNam FFT Spectrogram Analyzer is a precision tool designed for sound engineers, researchers, students, and audio enthusiasts who need accurate frequency analysis and data logging.

■ 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 'Download\FNamDoc' 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: dB SPL offset tuning for FFT and Time Domain measurements to compensate for differences from professional equipment.
• Max Peak Hold: Displays and holds the maximum amplitude values across the frequency spectrum.
• Frequency Response Preview: WiFi TCP-based acoustic frequency response measurement (requires FNam Frequency Noise Generator).
• 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 formulas for accurate weighting calculations.

⚠️ Note: While this app uses IEC 61672 standard 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. ## Rankings - #859,090 — Overall ## Permissions and access ### Permissions - `android.permission.ACCESS_NETWORK_STATE` - `android.permission.ACCESS_WIFI_STATE` - `android.permission.CHANGE_WIFI_STATE` - `android.permission.INTERNET` - `android.permission.RECORD_AUDIO` - `com.android.vending.CHECK_LICENSE` - `com.fnam.audioanalyzerv01.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` ## Similar extensions and apps - [FFT Audio Frequency Analyzer](https://chrome-stats.com/d/com.frequencyanalyzer.app) — 34 users - [Spectrum Analyzer: Audio FFT](https://chrome-stats.com/d/com.simonj.spectrumanalyzer) — 1,571 users - [FFTX](https://chrome-stats.com/d/com.fftx.online) — 50 users - [AudioUtil Audio Analysis Tools](https://chrome-stats.com/d/org.sbaudio.audiotools) — 895 users, 3.57 / 5 - [Sound Analyzer Pro](https://chrome-stats.com/d/jp.nokubi.nobapp.soundanalyzer) — 10,611 users, 3.93 / 5 - [SpectralScan Audio Analyzer](https://chrome-stats.com/d/com.otsukare.spectralscan) — 14,689 users, 4.79 / 5 - [Audio Analyzer](https://chrome-stats.com/d/pl.epomoce.analizatordzwieku) — 2,840 users - [bismark bs-spectrum](https://chrome-stats.com/d/jp.bismark.bsspectrum) — 402 users - [SimpleFFT](https://chrome-stats.com/d/jp.co.MusicalSoundLab) — 33,117 users, 1.00 / 5 - [Sound Analyzer Basic](https://chrome-stats.com/d/jp.nokubi.nobapp.soundanalyzer.free) — 509,633 users, 4.11 / 5 - [FFT- Explore & Audio](https://chrome-stats.com/d/com.fftaudio.fft_watch_and_listen) — 1,242 users - [Audio Espectro](https://chrome-stats.com/d/org.audio.espectro) — 51 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.fnam.audioanalyzerv01)