# FFTWave

> Microphone waveform and spectrum analyzer with peak detection. (iPhone/iPad app by Eisaku Nozu.)

- Source: https://appshunter.io/ios/app/fftwave/id1080227446 (this page in markdown: same URL + `.md`)
- Developer: [Eisaku Nozu](https://appshunter.io/developer/1080227445)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.30/5 from 15 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 8 MB
- Languages: American English
- Released: 2016-02-05
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fftwave/id1080227446/reviews.md

## What is FFTWave?

This app displays the waveform of the sound from the microphone.
In addition, it can display a spectrum by Fourier transform.
You can check the frequency characteristics of the sound.
There are functions of peak detection, peak hold.
Supporting the Pinch Zoom Gestures.
It help sound adjustment and howling analysis.

## Key features

- Microphone waveform display
- Spectrum analysis via Fourier transform
- Frequency characteristic checking
- Peak detection and hold
- Pinch zoom gestures
- Howling analysis

## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/fftwave/id1080227446/reviews.md

### 1/5 — Need update

*2025-03-22*

Some button issues and small but annoying bugs
I tried to check the ambient frequency to see if the neighbor was using the subwoofer to disturb me, but I was unsuccessful.

### 3/5 — Very flexible

*2024-06-17, version 1.4*

It would be even better if it could input and output to emails.

### 5/5 — FFT Wave

*2023-10-06*

Simple to use. Works well. Good job Nozu-san

### 5/5 — Fun & Easy Educational Tool

*2023-09-05*

This free App is a quick & easy way to illustrate Fourier modes and even concepts like frequency & pitch. My thanks to the developer, Eisaku Nozu, for creating & sharing it.

### 4/5 — Easy to use but need to improve accuracy

*2023-08-26*

App is very intuitive and free. It shows numerical values of frequency of peeks. However, the value is not super accurate. For example, the middle A sound is 440Hz. The app shows 441.4. And it’s happening on both my iPhone and iPad. So it’s very unlikely due to the microphone.

### 4/5 — Compact size, ad free, versatile, difficult to use

*2023-07-26*

This is a wonderfully, basic, simple, graphical FFT app.  If I authored it, it would look a lot like this.

On the iPhone 13 Mini, the menu is very difficult to tap on because it’s underneath the iOS clock.  The pinch to zoom only zooms in on low frequencies on the left.  I never found a way to inspect 500-1000Hz specifically.

I’m hanging onto this app.  I like imagining how this may evolve into something better.

### 5/5 — Perfetta

*2023-05-07*

Nessuna funzione speciale ma è l’unica che ho trovato dopo una ventina di app che funziona veramente ed è anche senza pubblicità.

### 5/5 — A Down-To-Earth Spectrum Analyzer and Oscilloscope

*2022-09-03*

There are no ads you have to worry about with this app, it’s very straightforward to use, and it works exceedingly well with external audio interfaces like my IK Multimedia iRig 2, which is typically used with guitars and other musical instruments. Perfect for those of us who still like to repair tape decks, where precise frequency readings are essential, especially for motor speed and playback head azimuth adjustments.

The app was definitely a big help for replacing the belts on my Sony cassette deck from 1996. 👍

### 5/5 — Good app

*2022-06-26*

I used this app for my physics project. I loved how we can see labels for frequency peaks and zoom the spectrogram.

### 5/5 — Very good implementation

*2018-05-22*

Thank you

## Frequently asked questions about FFTWave

### What does FFTWave do?

FFTWave displays the waveform of sound from your microphone and can show a spectrum analysis using Fourier transform. It helps you check frequency characteristics and analyze sounds.

### What are the key features of FFTWave?

Key features include waveform display, spectrum analysis, peak detection and hold, and support for pinch zoom gestures for detailed viewing. It's useful for sound adjustment and howling analysis.

### Is FFTWave free to use?

Yes, FFTWave is available for free. There are no costs associated with downloading or using its core functionalities.

### What devices support FFTWave?

FFTWave is compatible with iPhone, iPad, and iPod devices, running on iOS.

### How often is FFTWave updated?

The app was last updated on November 29, 2022, with version 1.4. This indicates it receives periodic updates for improvements and compatibility.

### What is the age rating for FFTWave?

FFTWave has an age rating of 4+, making it suitable for a wide range of users.

### Does FFTWave have ads?

No, FFTWave does not contain advertisements. Users can enjoy the application without interruptions.

### How accurate is the spectrum analysis in FFTWave?

The app utilizes Fourier transform for spectrum analysis, which is a standard method for determining frequency components of a signal. While specific accuracy metrics are not provided, it is designed to help check frequency characteristics.

## Version history (last 5 releases)

### 1.4 — 2022-11-29

Fixed a bug that did not work properly on iOS16.

### 1.3 — 2022-07-27

Improved the button display.
Fixed a bug that the scale display overlaps.

### 1.2 — 2020-06-08

Fixed a bug that an error occurs when scrolling with the [Setting] function.

### 1.1 — 2016-04-06

Change of URL

### 1.0 — 2016-02-05

No release notes.

## Apps similar to FFTWave

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Infrasound Recorder](https://appshunter.io/ios/app/infrasound-recorder/id969566810) | 4.6 (285) | Free | Utilities |
| [Vibration analysis](https://appshunter.io/ios/app/vibration-analysis/id817385888) | 4.0 (42) | Free | Utilities |
| [SignalScope X](https://appshunter.io/ios/app/signalscope-x/id1304775893) | 3.0 (21) | Free | Utilities |
| [PAcalculate](https://appshunter.io/ios/app/pacalculate/id793460437) | 5.0 (7) | Free | Utilities |
| [Spectrolite](https://appshunter.io/ios/app/spectrolite/id1480240180) | 4.8 (51) | Free | Utilities |
| [HAA CinemaTools with HAA Link](https://appshunter.io/ios/app/haa-cinematools-with-haa-link/id1180224503) | 5.0 (1) | Free | Utilities |

## Related topics

[fft](https://appshunter.io/ios/topics/fft) · [fftwave](https://appshunter.io/ios/topics/fftwave) · [eisaku nozu](https://appshunter.io/ios/topics/eisaku-nozu) · [fft wave](https://appshunter.io/ios/topics/fft-wave) · [fft plot](https://appshunter.io/ios/topics/fft-plot) · [fft analyzer](https://appshunter.io/ios/topics/fft-analyzer) · [sonic tools svm](https://appshunter.io/ios/topics/sonic-tools-svm) · [fftt](https://appshunter.io/ios/topics/fftt)

---

*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 2026-06-01.*