# SignalSpy - Audio Oscilloscope, Frequency Spectrum Analyzer, and more

> Audio signal analysis tools: oscilloscope, spectrum analyzer, level indicator, spectrogram. (iPhone/iPad app by Codelle.)

- Source: https://appshunter.io/ios/app/signalspy-audio-oscilloscope-frequency-spectrum-analyzer-and-more/id888698146 (this page in markdown: same URL + `.md`)
- Developer: [Codelle](https://appshunter.io/developer/429266189)
- Category: Music, Utilities, Music
- Price: $2.99
- Rating: 1.33/5 from 6 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.1 · 2 MB
- Languages: English
- Released: 2014-06-22
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/signalspy-audio-oscilloscope-frequency-spectrum-analyzer-and-more/id888698146/reviews.md

## What is SignalSpy?

SignalSpy is a suite of powerful tools that let you analyze audio signals. Included are an oscilloscope, a spectrum analyzer, level indicator and spectrogram.

All tools are built for extreme accuracy and thus can be used in studio applications. Many of the tools are configurable to adapt them to your needs.

Features:

- Four highly accurate audio signal analyzers.
- The oscilloscope can be synchronized to your waveform using a trigger level.
- Frequency scale configurable between logarithmic and linear.
- Very fast screen updating giving you a true real-time display.

## Key features

- Audio signal analyzers
- Synchronized oscilloscope
- Configurable frequency scale
- Real-time display
- Spectrogram analysis

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/signalspy-audio-oscilloscope-frequency-spectrum-analyzer-and-more/id888698146/reviews.md

### 1/5 — Doesn't work on modern OS

*2024-02-28*

App hasn't been updated in so long it doesn't work either on iOS 16 iPhone or on a Mac.
Do not buy unless you have a very old and non-updated phone/tablet for some reason.

### 1/5 — Does not work

*2021-02-28*

Crashes on opening

### 1/5 — Doesn’t work at all

*2021-01-30*

Opened the app and as soon you you tap a button in the app to do something, it crashes

### 1/5 — Simply doesn’t work.

*2019-08-24*

The app in not responding to any audio signal.
Not to built in mic, not to any external mic. 
Mutes any audio playing on a device. 
Completely useless, waste of money.

### 1/5 — Dosent work

*2019-01-18*

App did not work, no help, not responding at all.
I dont recommend it.

### 1/5 — Totally useless

*2019-01-12*

Does not ask to access the microphone.  Therefore does nothing.

### 3/5 — The beginnings of a great app

*2017-05-29, version 1.0*

Useful app to take a closer look at a sound. I really like the spectrogram mode where you can see the evolution of peaks in the spectrum over time. Unfortunately the frequency scale is completely wrong - just feed it a pure sine wave of known frequency, and the peak appears at the wrong frequency (about 10x too low)

Two years after I first reviewed this there is still lots of missing functionality: on screen stop/start, screen capture (without "screen shot"), ability to zoom / change scales, ability to add a cursor to read detailed information.

Right now this is no more than a toy app, OK for exploring the sounds around you but no scientific instrument...

### 1/5 — Audio engineer

*2016-11-19, version 1.0*

It's a shame this app is for sale.
The spectrograph returns data that is off by a factor of 10. Play it a 440hz "A" and it reads out a bold line around 40hz. I can't read the exact measurement because the scale is useless.
The RTA section is filled with noise, it looks like the FFT was not windowed at all, and the scale is linear. Annoying and useless.
The oscilloscope seems cool, but there are not enough user controls to make it anything more than a fun waveform display. Complete waste.
Please make the tweaks and give the users what they paid for.

### 1/5 — Mr.

*2016-05-07, version 1.0*

It would ha been better if the x axis is adjustable for few seconds and also the ability to pause the plot.

### 1/5 — Useless

*2016-01-24, version 1.0*

You can't analyze anything with this app. There is no scales or units. It looks like in development mode and shouldn't cost any money yet.

## Frequently asked questions about SignalSpy

### What is SignalSpy?

SignalSpy is a suite of powerful tools for analyzing audio signals, including an oscilloscope, spectrum analyzer, level indicator, and spectrogram. It is designed for extreme accuracy and can be used in studio applications.

### Does SignalSpy have ads?

No, SignalSpy does not contain advertisements. It is a paid application that offers an ad-free experience for its users.

### What devices does SignalSpy support?

SignalSpy is available for iPhone, iPad, and iPod. It is designed to work across these Apple devices.

### How accurate is SignalSpy?

SignalSpy is built for extreme accuracy and can be used in studio applications. The oscilloscope can be synchronized with a trigger level for precise waveform analysis.

### Can I customize SignalSpy's frequency scale?

Yes, the frequency scale in SignalSpy is configurable, allowing you to switch between logarithmic and linear settings to suit your analysis needs.

### How often is SignalSpy updated?

SignalSpy was last updated on June 22, 2014, with version 1.0. There have been no subsequent updates recorded since its release.

### What is the user sentiment for SignalSpy?

Based on 6 ratings, SignalSpy has an average rating of 1.3 stars. This indicates a generally negative user sentiment.

### What is the price of SignalSpy?

SignalSpy is a paid application priced at $2.99. This one-time purchase grants access to all its features.

## Version history (last 1 release)

### 1.0 — 2014-06-22

No release notes.

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## More apps by Codelle

- [MidiPad 2](https://appshunter.io/ios/app/midipad-2/id896879399)
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All apps by Codelle: https://appshunter.io/developer/429266189

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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 2026-06-10.*