# FFTWave — user reviews

> 13 indexed App Store user reviews of FFTWave by Eisaku Nozu, rated 4.30/5 from 15 ratings.

- Source: https://appshunter.io/ios/app/fftwave/id1080227446/reviews
- App overview in markdown: https://appshunter.io/ios/app/fftwave/id1080227446.md
- Rating breakdown: 5★ 8 · 4★ 6 · 3★ 0 · 2★ 0 · 1★ 1

## Most critical reviews (10 lowest-rated)

### 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.

### 2/5 — Great idea, but unfinished

*2018-02-08, version 1.1*

This is a great idea, with a nice graphic display. Sadly, though, there appears to be no opportunity to hold and analyse a sound or to export the Fourier series data to an email. 
Also, the pinch zoom and scroll controls don’t work properly, yet. 
Please keep working on this, developer.

### 3/5 — Very flexible

*2024-06-17, version 1.4*

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

### 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.

### 4/5 — Pretty decent

*2017-05-27*

A little tweaky in resizing bandwidth but VERY straight forward and very useful for live sound control. No ads.

### 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.

### 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. 👍

## Most praised reviews (3 highest-rated)

### 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

### 5/5 — Good App

*2018-01-28*

A decent free FFT app. I’m not sure of its accuracy, but that may be a factor of the iPad microphone too. It has an easy to use display, and clearly shows the peak of the spectrum, as well as a view or the waveform.

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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 2026-06-01.*