# e-scope 3-in-1 — Oscilloscope+FFT+Signal Gen.

> Multi-tool for audio analysis: oscilloscope, FFT spectrum analyzer, and signal generator. (iPhone/iPad app by e-skett Corp..)

- Source: https://appshunter.io/ios/app/e-scope-3-in-1/id660574048 (this page in markdown: same URL + `.md`)
- Developer: [e-skett Corp.](https://appshunter.io/developer/591591895)
- Category: Music, Utilities
- Price: $1.99 with in-app purchases
- Rating: 3.00/5 from 1 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 2 MB
- Languages: American English, Japanese
- Released: 2013-06-21
- Data updated: 2026-08-22
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/e-scope-3-in-1/id660574048/reviews.md

## What is e?

Three tools (oscilloscope, FFT analyzer (spectrum analyzer), signal generator) are included in the e-scope 3-in-1.

Please take a look at this video.
Basic functions:
http://youtu.be/WPm4Dbz0WAo
Automatic measurement add-on:
http://youtu.be/K6_stq_t2zQ

It can observe the frequency characteristics of audio devices using an FFT analyzer and a signal generator.
Observation of frequency characteristics in real time is possible by using the FFT synchronization sweep mode.
inputs are acquired via the built-in microphone or headset connector.

-Oscilloscope
The oscilloscope has three modes.
* Normal mode: It is suited to observe music waveforms.
* Trigger mode: This mode is suitable for repeated waveforms such as sine wave. You can observe waveforms in stationary condition.
* Single mode: This mode is suitable for observing one-time waveform such as impact sound.
You can change the sensitivity and time span by pinch out and pinch in.

-FFT analyzer
It is possible to analyze the frequency spectrum of an input signal.
The peak level and the frequency are displayed at the top of the screen. The display can also be used as a simple frequency counter when you enter a single signal.
In addition, the THD (Total Harmonic Distortion) value is displayed at the bottom left of the screen.
By pressing the resolution button, you can select the frequency resolution free three types.
When you press the peak hold button, the maximum value of the signal that you are currently viewing is displayed in a red line.

-Signal generator
The signal generator can be used to generate a signal of four types:
Sine wave of 1Hz to 20kHz, White noise, Linear sweep and Log sweep ranging from 20Hz to 20KHz.
When you tap the area that displays the frequency or sweep time range, a picker will appear. Please set the appropriate numbers in it.
By using the mode [optimized for FFT], it can automatically change to a frequency with highest FFT accuracy.
Please use the feature if you want to accurately measure the THD.
While the frequency is displayed, it will be ignored when you enter 0000.
During the FFT synchronization sweep mode, when you enter 000 as the display start time for the sweep time display, the FFT synchronization sweep mode will be activated. It will change the frequency at high speed in FFT analysis unit time (less than 0.1 seconds) .
It is possible to observe the frequency characteristic in real time in this mode.

When you press the Copy button at any mode, you can capture screen and save it to a camera roll.

## Key features

- Oscilloscope with Normal, Trigger, and Single modes
- FFT analyzer with peak level, frequency, and THD display
- Signal generator for sine waves, white noise, and sweeps
- Real-time FFT synchronization sweep mode
- Screen capture and save functionality
- Adjustable sensitivity and time span

## Pricing and in-app purchases

Base price: $1.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Automatic measurement option | $1.99 | one-time |


## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/e-scope-3-in-1/id660574048/reviews.md

### 5/5 — オリジナルで充分対応

*2018-05-25*

プローブの取れない音響に最適本物のオシロスコープと遜色無し。
その上DDSジェネレータも要らんし、改造プローブも私は要らない。
物本のオシロスコープ持っとるし、予備知識有りだから、躊躇なしに使える。

### 1/5 — 外部出力できない

*2015-10-02*

使えない 良いなと思ったが、拡大して見ることできない。止まってしまう‼️

### 3/5 — Too basic

*2015-03-05*

It does work
But i thought it would have more features like trigger lever. Adjust something on the fft, like sampling rate and sampling time gain etc the basics of ffts and scopes

### 4/5 — バグ

*2014-06-11*

Sweep logのTONE GENERATORがバグってて音が出てません。最低音で停止したままでは？

### 4/5 — Works very well.

*2014-02-25*

I have suggested that it support background audio so I can use the signal generator with another app in the foreground. In any case it is well worth buying :-) .

### 4/5 — Turn off mic input?

*2013-12-11*

Have been looking for something like this for a while.Any way to turn off the mic input once activated?Trying to view pure waveform but is mixed with mic input.
Cheers

### 5/5 — ５ｉｎ１といってもいいかも

*2013-07-20*

オシロ、スペアナ、信号発生器の３つが入った３ｉｎ１だが、スペアナモードは周波数カウンタや歪率計としても使えるので５ｉｎ１といってもいいかも。欲しかった機能が全部入ってた。
ただ、操作ボタンはちょっと小さく、押しにくいような気もするが。

### 5/5 — すばらしい！

*2013-07-11*

なんとこんな本格的な測定器（オシロ＋スペアナ＋SG）のアプリがあるとは驚きました、GUIだけ見ていたら、ほとんど本物の測定器と区別がつきません。実際に使おうと外部との接続をどうするかが問題になってきますが、それも開発者のサイトに詳しく書かれています。測定器としてのスペックは期待できませんが、たぶんこれはiphoneのハードウェアスペックで制限されてしまっているものと思います。あとは精度が気になるところですが、これは今後のバージョンアップに期待したいと思います。仕事では使えませんが、個人が趣味の電子工作で使うのであれば、十分使えると思います。スペックや精度的には足りない面もありますが、手軽なアプリでここまで作ってくれたことにエールを送って星5つとしました。

### 5/5 — Very Cool, works as advertised.

*2013-06-22*

Works better than Sondbeam, my previously favorite oscilloscope.

### 5/5 — すばらしい！

*2013-06-22*

精度はどうか分かりませんが欲しいものがこれ一つで出来ました。
音の教育用ツールに最適。

## Frequently asked questions about e

### What are the main functions of e-scope 3-in-1?

e-scope 3-in-1 includes three primary tools: an oscilloscope for waveform visualization, an FFT analyzer for frequency spectrum analysis, and a signal generator for producing various audio signals.

### How can I observe audio device frequency characteristics with e-scope 3-in-1?

You can observe frequency characteristics in real time using the FFT analyzer and signal generator. The FFT synchronization sweep mode is particularly useful for this.

### What types of signals can the e-scope 3-in-1 signal generator produce?

The signal generator can produce sine waves from 1Hz to 20kHz, white noise, and linear or log sweeps ranging from 20Hz to 20KHz.

### Does e-scope 3-in-1 have ads?

No, e-scope 3-in-1 does not contain advertisements. It is a paid application.

### What is the price of e-scope 3-in-1?

e-scope 3-in-1 is available for purchase at $1.99.

### On which devices can I use e-scope 3-in-1?

e-scope 3-in-1 is supported on iPhone, iPad, and iPod devices.

### How frequently is e-scope 3-in-1 updated?

The latest version of e-scope 3-in-1 is 2.31, and it was last updated on January 17, 2025. This indicates a relatively active update schedule.

### What is the age rating for e-scope 3-in-1?

e-scope 3-in-1 has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 2.31 — 2025-01-17

Improved problems with external input

### 2.30 — 2023-04-18

Fixed a bug that occurred on iOS16.
Optimized screen display.

### 2.23 — 2018-09-25

Support fot iOS 12

### 2.22 — 2017-05-11

Update for iOS10 and stability improvements.

### 2.21 — 2016-08-10

Fixed bug that file send function does not work on iPad

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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 2026-08-22.*