N-Signal / FFT Sound Analyzer
kyu il jung Utilities iPhoneiPadiPod touch
N-Signal / FFT Sound Analyzer is a free Utilities app for iPhone and iPad by kyu il jung. Rated 5.0/5 from 2 ratings. Requires iOS 13.0.
- Rating
- 5.0
- 2 ratings
- Price
- Free
- on the App Store
- Size
- 32 MB
- Age 9+
- Updated
- Jan 8
- 2026 · v1.1.0
Screenshots
About N-Signal / FFT Sound Analyzer
N-Signal helps you visualize sound in real time. It measures sound pressure (dBSPL) and analyzes digital frequency levels (dBFS) with precision. Helpful for adjusting PA systems, testing stage sound, or improving room acoustics — whether in studios, churches, or classrooms. * Key Features - Real-time audio spectrum with FFT analysis - dB SPL sound pressure level meter (mic input) - Digital frequency analyzer (dBFS scale) - Smooth graph motion optimized for live performance - Supports dark modes - Designed for musicians, engineers, and sound enthusiasts N-Signal isn’t a laboratory-grade instrument, but a reliable audio reference tool for daily sound checks and education.
What’s new
Version 1.1.0 · Updated January 8, 2026
What's New in v1.1.0 Real-time Peak Frequency Display - See the dominant frequency at a glance with a live marker on the spectrum graph - Smart peak tracking prevents label flickering in noisy environments - Frequency shown with "≈" symbol to indicate approximation Improved Low-Frequency Accuracy - Enhanced FFT processing now measures down to 20Hz (previously 23Hz) - More accurate energy distribution across frequency bands Visual Refinements - Cleaner spectrum display with uniform floor level - Smoother curves in the low-frequency range
App privacy
The developer, kyu il jung, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers: Device ID
- Usage Data: Advertising Data
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Identifiers: Device ID
- Usage Data: Advertising Data
Used for: Third-Party Advertising
Alternatives to N-Signal / FFT Sound Analyzer
Looking for apps like N-Signal / FFT Sound Analyzer? Here are 6 similar apps on the App Store. The highest rated is Feedback Finder Pro (5.0/5), and all 6 are free to download.
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FNam FFT Spectrogram Analyzer
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Feedback Finder Pro
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Spectrum Analyzer: Audio RTA
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Easy Audio Spectrogram
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SpectralScan Audio Analyzer dB
4.9
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Spectrum Analyzer+ Audio FFT
2.3
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| N-Signal / FFT Sound Analyzer | 5.0 / 5 (2 ratings) | Free | January 8, 2026 | |
| FNam FFT Spectrogram Analyzer | – | Free | Oct 10, 2026 | Compare |
| Feedback Finder Pro | 5.0 / 5 (5) | Free | Dec 2, 2025 | Compare |
| Spectrum Analyzer: Audio RTA | 3.0 / 5 (2) | Free | Sep 14, 2026 | Compare |
| Easy Audio Spectrogram | – | Free | Jul 7, 2026 | Compare |
| SpectralScan Audio Analyzer dB | 4.9 / 5 (15) | Free | Oct 17, 2026 | Compare |
| Spectrum Analyzer+ Audio FFT | 2.3 / 5 (3) | Free | Oct 22, 2026 | Compare |