# FFT Plot — Sound Frequency Analyzer RTA

> Real-time audio frequency analyzer for sound measurement and visualization. (iPhone/iPad app by ONYX Apps.)

- Source: https://appshunter.io/ios/app/fft-plot/id569468015 (this page in markdown: same URL + `.md`)
- Developer: [ONYX Apps](https://appshunter.io/developer/356553882)
- Category: Music, Utilities
- Price: $9.99
- Rating: 4.80/5 from 90 App Store ratings · 109 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 7 MB
- Released: 2012-10-20
- Data updated: 2026-09-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fft-plot/id569468015/reviews.md

## What is FFT Plot?

***** "I use this app to detect sound feedback problems on live show and it became helpful and practic."

FFT Plot is a powerful real-time audio analysis app. Designed with musicians and recording engineers in mind, it can also be used by anyone interested in the world of sound. Ideal for room tuning or speaker tuning, the app enables portable, precision audio measurement and visualization.

Feature Highlights:
● FFT Size (2048 to 16384 points)
● Fast, Slow and Infinite Averaging
● Window function (Hamming, Hann, Rect)
● Peak Frequency detection
● Linear and Logarithmic scale
● Toggle between Flat, A and C weighting
● Pan to adjust visible dB range
● Draggable cursors
● iPhone X ready

Audio credits: "Evening Birdsong" and "Cuckoo" by Benboncan

## Key features

- Real-time audio analysis
- Frequency detection
- Averaging options
- Window functions
- Linear and logarithmic scales
- Weighting options
- Draggable cursors

## Chart rankings

- #185 in Top Paid · Music (US App Store)

## Recent user reviews (10 of 109)

All indexed reviews: https://appshunter.io/ios/app/fft-plot/id569468015/reviews.md

### 5/5 — good stuff

*2025-07-13, version 1.2.5*

heard about it from chris on his rift amps youtube channel.

easy to use great for showing you what your ears are hearing

### 1/5 — Disappointing

*2024-03-22, version 1.2.5*

Scale ranges can’t be customized and cannot see low frequencies below 20Hz and DC value.  If this were fairly clarified, which it isn’t, I would not have purchased this as it is really useless when those features are what you need.

### 5/5 — Great job

*2020-08-23, version 1.2.5*

This app does exactly what it claims to and looks great. I’ll be using it in the classroom soon to demonstrate concepts like “narrow sound frequency band”. Thanks!

### 5/5 — Review From an EE in Signal Processing: Excellent!

*2020-07-31*

I’m a BSEE (University of Washington, 1995) with experience and a bunch of patents in signal processing. This app is an outstanding tool for understanding the spectral content of an audio signal. It was clearly designed by someone with some expertise in the field, and it’s a joy to use.

### 5/5 — Absolutely fabulous

*2020-07-29*

Works perfectly. My only wish would be to also look at the waveform in the time domain. I use this app for testing new speakers. You will not be disappointed.

### 4/5 — Great app, needs a way to export data

*2019-08-20*

I greatly enjoy how feature full and yet simple this app is. It runs great and seems quite accurate. One thing I think is dearly missing is a way to export the signals measured to a file (like csv). Taking pictures is great for qualitative comparison but this tool would be way more valuable if it could be quantitative.

### 5/5 — Favorite fee app

*2018-11-20*

As a studio engineer who has to run live sound a few times a year, this app saves me a lot of trouble. I can ring out mics in a heartbeat and solve problems more quickly on the fly. No more sweeping for the exact frequency to notch, or for where to center the de-esser! It’s especially handy on an iPad with its larger display.

### 5/5 — Performant and accurate.

*2018-11-01*

Fantastic! Apps like this are the reason we don’t need to buy a stupidly overpriced bespoke piece of gear for every little niche... unless we want to! Keep up the great work!

### 5/5 — Super!

*2018-07-31, version 1.2.1*

Bardzo dobry program, szczerze polecam.

### 2/5 — 부족함이 좀 보입니다.

*2018-06-09*

기본적으로 아이패드 마이크 외에 4극-헤드폰젠더를 사용하면 인풋 단자 인식률이 너무 떨어집니다. 젠더 케이블 모두 10개씩은 교체해가면서 테스트했네요. 기기 내장 마이크 또는 헤드폰단자가 아닌 adc등으로 입력을 받아야 한다는점이 포터블용으로 아쉬움이 남네요. 그리고 반응이 fast와 midium사이 반응값이 더 있으면 라이브 현장에서 체크하기가 좋을듯 한데 그부분도 좀 아쉽습니다. 다른 무료 프로그램보다 조금 더 시인성이나 반응이 낫다 이정도이네요.

## Frequently asked questions about FFT Plot

### What does FFT Plot do?

FFT Plot is a real-time audio analysis application that provides precision sound measurement and visualization. It helps users detect sound feedback issues, tune rooms, and calibrate speakers by displaying audio frequencies.

### What are the key features of FFT Plot?

Key features include FFT sizes from 2048 to 16384 points, fast, slow, and infinite averaging, various window functions (Hamming, Hann, Rect), peak frequency detection, linear and logarithmic scales, A and C weighting options, and draggable cursors for detailed analysis.

### Is FFT Plot free to use?

Yes, based on the provided information, FFT Plot is a free application. There are no mentions of in-app purchases or advertisements, suggesting it is entirely free to download and use.

### Who would benefit from using FFT Plot?

This app is designed for musicians and recording engineers who need to analyze sound in real-time. It's also useful for anyone involved in live shows, room tuning, or speaker calibration, as well as individuals interested in understanding sound frequencies.

### What kind of audio analysis can I perform with FFT Plot?

You can perform detailed frequency analysis, detect peak frequencies, and visualize sound levels across a range of frequencies. The app supports different averaging methods and weighting options to tailor the analysis to specific needs, such as identifying feedback or optimizing acoustics.

## Version history (last 5 releases)

### 1.2.5 — 2018-11-19

Thank you for helping us improve FFT Plot app! Please rate it on the App Store now, so we can make it even better!

● Toggle between Flat, A and C weighted modes

### 1.2.3 — 2018-10-31

Thank you for helping us improve FFT Plot app! Please rate it on the App Store now, so we can make it even better!

● Support for the latest iOS and devices
● Fixed microphone permission issue with iOS 12

### 1.2.1 — 2015-08-18

Thank you for helping us improve FFT Plot app! Please rate it on the App Store now, so we can make it even better! 

● 64-bit
● Minor fixes

### 1.1 — 2014-12-20

Thank you for helping us improve FFT Plot app! Please rate it on the App Store now, so we can make it even better! 

● Native iPhone 6 graphics
● Does not mute other audio
● Audio Interface Settings
● Stability improvements

### 1.0 — 2012-10-20

No release notes.

## Apps similar to FFT Plot

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Spectrum Analyzer: Spectrogram](https://appshunter.io/ios/app/spectrum-analyzer-spectrogram/id981810895) | 4.2 (195) | Free | Music |
| [Sound Decibel Meter-NIOSH,OSHA](https://appshunter.io/ios/app/sound-decibel-meter-nioshosha/id1571075296) | 4.5 (335) | Free | Music |
| [Decibel meter for personal use](https://appshunter.io/ios/app/decibel-meter-for-personal-use/id6448749318) | 4.5 (28) | Free | Music |
| [Audio Spectrum Analyzer dB RTA](https://appshunter.io/ios/app/audio-spectrum-analyzer-db-rta/id1281873790) | 4.5 (3,042) | Free | Music |
| [Audio Spectrum Analyzer Pro](https://appshunter.io/ios/app/audio-spectrum-analyzer-pro/id1152352806) | 4.4 (238) | Free | Music |
| [iAnalyzer](https://appshunter.io/ios/app/ianalyzer/id335449113) | 4.2 (74) | Free | Music |

## More apps by ONYX Apps

- [Oscilloscope](https://appshunter.io/ios/app/oscilloscope/id388636804)
- [LED Audio Spectrum Visualizer](https://appshunter.io/ios/app/led-audio-spectrum-visualizer/id396083500)
- [ClockMaster - Time Regulator](https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882)
- [Metronome Ϟ](https://appshunter.io/ios/app/metronome/id416443133)
- [Spectrum Analyzer RTA](https://appshunter.io/ios/app/spectrum-analyzer-rta/id490078884)
- [Octave RTA](https://appshunter.io/ios/app/octave-rta/id569156857)

All apps by ONYX Apps: https://appshunter.io/developer/356553882

## Related topics

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

---

*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 2026-09-04.*