# Spectrum Analyzer+ FFT — Audio Frequency Viewer

> Real-time audio frequency analyzer with FFT spectrum display. (iPhone/iPad app by Kyu-Hee Jang.)

- Source: https://appshunter.io/ios/app/spectrum-analyzer-plus-fft/id6760830858 (this page in markdown: same URL + `.md`)
- Developer: [Kyu-Hee Jang](https://appshunter.io/developer/1587578867)
- Category: Utilities, Productivity
- Price: Free
- Rating: 2.30/5 from 3 App Store ratings
- Age rating: 17+
- Requires: iOS 17.0 · 69 MB
- Languages: American English
- Released: 2026-03-31
- Data updated: 2026-08-19
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/spectrum-analyzer-plus-fft/id6760830858/reviews.md

## What is Spectrum Analyzer+ FFT?

Spectrum Analyzer+ FFT transforms your iPhone into a professional audio frequency analyzer. Using the built-in microphone, it visualizes sound frequencies in real time with a detailed FFT spectrum display.

The analyzer captures live audio through the microphone and breaks it down into individual frequency bands, showing the amplitude of each frequency from 20 Hz to 20 kHz. Note: This app analyzes audio in real time for visualization purposes only — it does not record or store any audio.

Key Features:
- Real-time FFT audio spectrum visualization via microphone
- Frequency range from 20 Hz to 20 kHz
- Peak frequency detection with Hz display
- Average dB level per frequency band
- Adjustable dB range for detail viewing
- Smooth animated bar display
- Dark theme optimized for readability

Whether you're a musician tuning instruments, an audio engineer checking room acoustics, or a sound enthusiast exploring frequencies, Spectrum Analyzer+ gives you a powerful visualization tool in your pocket.

## Key features

- Real-time FFT audio spectrum visualization
- Frequency range 20 Hz to 20 kHz
- Peak frequency detection
- Average dB level per band
- Adjustable dB range
- Dark theme


## Frequently asked questions about Spectrum Analyzer+ FFT

### What is Spectrum Analyzer+ FFT?

Spectrum Analyzer+ FFT transforms your iPhone into a professional audio frequency analyzer. It visualizes sound frequencies in real time with a detailed FFT spectrum display, showing amplitude and peak frequencies.

### Does Spectrum Analyzer+ FFT record audio?

No, Spectrum Analyzer+ FFT analyzes audio in real time for visualization purposes only. It does not record or store any audio data.

### What is the frequency range of Spectrum Analyzer+ FFT?

The analyzer captures live audio through the microphone and breaks it down into individual frequency bands, showing the amplitude of each frequency from 20 Hz to 20 kHz.

### What devices does Spectrum Analyzer+ FFT support?

Spectrum Analyzer+ FFT is supported on iPhone and iPod devices.

### What is the age rating for Spectrum Analyzer+ FFT?

Spectrum Analyzer+ FFT has an age rating of 17+.

### How often is Spectrum Analyzer+ FFT updated?

The latest version, 1.0.15, was released on June 18, 2026, indicating recent updates. The app was initially released on March 31, 2026.

### Does Spectrum Analyzer+ FFT have ads?

Yes, Spectrum Analyzer+ FFT contains advertisements.

### What is the user rating for Spectrum Analyzer+ FFT?

Spectrum Analyzer+ FFT has a user rating of 2.3 stars based on 3 ratings.

## Version history (last 5 releases)

### 1.0.26 — 2026-08-16

New: save the current spectrum as a reference, then see it overlaid on the live view with the difference in dB. Treat a room, move a speaker, swap a cable — and know whether it actually helped.

Thanks for the reviews and feedback!

### 1.0.25 — 2026-08-15

Fixed the decibel scale: levels were reading about 6 dB low because the analysis window's gain was not being accounted for. Peaks, averages and CSV exports are now correct. If you had dialled in a calibration offset to compensate, please reset it.

Thanks for the reviews and feedback!

### 1.0.24 — 2026-08-11

The dominant peak now shows its musical note and how far off it sits, like A4 +12¢. The three analysis modes finally do something: voice ignores low-end rumble, room concentrates on the bottom 500 Hz, and machine looks for mains hum by counting its harmonics rather than any single tone. The analyser also starts listening the instant you tap.

### 1.0.23 — 2026-08-06

Ads no longer interrupt you mid-task. Anything full-screen now waits until you have finished what you were doing, and the app stops showing a blank pause where an ad failed to load.

### 1.0.22 — 2026-07-30

Thanks for using our app! This update brings behind-the-scenes performance and stability improvements for a smoother, more reliable experience. Your support means the world to us.

## More apps by Kyu-Hee Jang

- [Calculator+ Tip Tax BMI Unit](https://appshunter.io/ios/app/calculator-plus-tip-tax-bmi-unit/id1587591476)
- [QR Lens+ Barcode Scanner Pro](https://appshunter.io/ios/app/qr-lens-plus-barcode-scanner-pro/id1590631012)
- [Sound Noise Meter+ dB SPL](https://appshunter.io/ios/app/sound-noise-meter-plus-db-spl/id1593197145)
- [Tremor Vibration Meter](https://appshunter.io/ios/app/tremor-vibration-meter/id6759666731)
- [Lux Light Meter - Luminance](https://appshunter.io/ios/app/lux-light-meter-luminance/id6759858193)
- [Barometer: Air Pressure](https://appshunter.io/ios/app/barometer-air-pressure/id6759883097)

All apps by Kyu-Hee Jang: https://appshunter.io/developer/1587578867

## Related topics

[fft analyzer](https://appshunter.io/ios/topics/fft-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 2026-08-19.*