# PhaseChecker — Align your speakers

> Sound system phase and polarity testing utility for optimal audio performance. (iPhone/iPad app by Rick Peacock.)

- Source: https://appshunter.io/ios/app/phasechecker/id1160400348 (this page in markdown: same URL + `.md`)
- Developer: [Rick Peacock](https://appshunter.io/developer/286052385)
- Category: Utilities, Music
- Price: $0.99
- Rating: 2.00/5 from 3 App Store ratings · 19 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.1 · 1 MB
- Languages: American English
- Released: 2016-10-04
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/phasechecker/id1160400348/reviews.md

## What is PhaseChecker?

The PhaseCheck app will run a test signal through your sound system to ensure your speakers are in-phase and wired with the correct polarity. It can be run either manually or automatically. 

Manual mode allows you to run the test signal and flip the phase so you can listen yourself to ensure your sound system is setup correctly. 

Automatic mode will run a series of test signals through your sound system and use the microphone on the device to analyse the results.

New in version 2.0 is a waveform view mode for advanced use. It allows you to play an asymmetrical waveform (ramp waveform), record the sound from each speaker close up and capture the waveforms to then compare them. 

Phase is a difficult concept so full help is available in the app to ensure you get the best results.

You should check the phase of your sound system whenever the wiring has been changed to ensure everything is the correct polarity.

When a sound systems speakers are out of phase the sound quality is affected massively. Bass is reduced significantly and stereo imaging gives the illusion of the sounds pulling outside of the room.

To run the check connect your iOS device to your sound system so it can play audio. If possible place the iOS device evenly between the speakers. Phase cancellation will not occur close to the speakers so ensure the device is not too close. Ensure the volume is at a comfortable listening level and if possible ensure there is no background noise to interfere with the scan.

## Key features

- Speaker phase and polarity testing
- Manual and automatic test modes
- Microphone-based analysis
- Waveform view for advanced users
- In-app help and guidance
- Audio output connection

## Recent user reviews (10 of 19)

All indexed reviews: https://appshunter.io/ios/app/phasechecker/id1160400348/reviews.md

### 1/5 — ใช้ไม่ได้จริง

*2025-11-02, version 2.1*

ใช้ไม่ได้ วัดไม่ได้ผลอะไร ไม่สามารถใช้งานได้จริง

### 5/5 — Excellent

*2025-04-09, version 2.1*

Excellent. Thank you.

### 4/5 — Use mirroring to make it work

*2024-01-20, version 2.1*

To everyone that can’t figure this out, turn on screen mirror to your Apple TV.

### 1/5 — Doesn’t work for me

*2023-11-07, version 2.0*

iPhone 14 connected via Bluetooth, both music player and amazon music and also key clicks coming through system. Not this app though, it keeps coming out of the phone speaker so can’t check phases. Wouldn’t mind so much but paid for an app that doesn’t work.

### 1/5 — Useless

*2023-09-25, version 2.0*

It just plays tones through your phone speakers. 100% useless. What a waste of money.

### 1/5 — Doesn’t work

*2023-01-22, version 2.0*

As other reviewers have pointed out, this doesn’t emit a signal over Bluetooth or airplay. Worthless app

### 5/5 — Microphone mastery

*2022-09-06, version 2.0*

I have been able to improve my hifi listening in this unconventional room set up thanks to this app, a bit of fiddling, and my phone’s microphone.  Remember, people, that the “out-of-phase” read should end up quieter than the “in-phase” read to get the benefit of proper set up.  The developer explains this on (his) website.

Witness that equivalent old-school media is many times the price.

### 1/5 — Does not work at all

*2022-06-22, version 2.0*

Tried to reverse the phase on purpose and still said in phase!

### 1/5 — Sad face

*2020-06-07, version 1.0*

Sadly just doesn’t work. I even changed the wires on one of the speakers round, still told me it was phased correctly.

### 2/5 — Poor instructions

*2019-12-05, version 1.0*

Poor user interphase, and ambiguous instructions. 

It’s not clear whether the standard tone is meant to be softer than the phase tone or vice versa. Instructions need to be much more clear on what to expect. 

At the moment this app is borderline useless until the instructions and UI are clearer with the user.

## Frequently asked questions about PhaseChecker

### What is PhaseChecker used for?

PhaseChecker is used to test your sound system's speakers to ensure they are in-phase and wired with the correct polarity. This is essential for achieving optimal bass response and stereo imaging in your audio setup.

### How does PhaseChecker work?

It runs a test signal through your sound system. You can use manual mode to listen and flip phase yourself, or automatic mode which uses your device's microphone to analyze the results.

### What are the benefits of using PhaseChecker?

Correct speaker phasing significantly improves sound quality, preventing reduced bass and distorted stereo imaging. It ensures your sound system performs at its best.

### Does PhaseChecker have ads?

No, PhaseChecker does not contain advertisements. It is a paid application designed for a focused user experience.

### What devices does PhaseChecker support?

PhaseChecker is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system.

### How often is PhaseChecker updated?

The latest version, 2.1, was released on November 21, 2023. Updates typically include new features and improvements to enhance user experience and functionality.

### What is the age rating for PhaseChecker?

PhaseChecker has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content restrictions.

### Can PhaseChecker be used for professional audio setups?

Yes, with its manual mode and advanced waveform view, PhaseChecker can be beneficial for advanced users and professionals seeking precise audio calibration.

## Version history (last 3 releases)

### 2.1 — 2023-11-21

- Improvements for working with bluetooth audio
- Improvements for iOS17

### 2.0 — 2021-09-03

Big changes in this major release!
- Completely new UI using SwiftUI
- Level history display to see average level when the test tone is in phase and out of phase
- Improved automatic mode with more detailed summary
- Option to rotate app screen to allow easy operation while pointing the microphone part of your iPhone at your speaker system
- New trace capture mode to analyse audio waveforms directly
- Automatic gain control on trace capture mode to view signals of any volume
- Microphone signal audio filter to focus on test tone frequency
- Supports both dark and light modes
- More detailed help for all modes
- Updated audio code using latest audio frameworks

### 1.0 — 2016-10-04

This app has been updated by Apple to display the Apple Watch app icon.

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## More apps by Rick Peacock

- [BPM Tap Tempo](https://appshunter.io/ios/app/bpm-tap-tempo/id286052382)
- [Sleeps 'till special events](https://appshunter.io/ios/app/sleeps-till-special-events/id1067556106)
- [Tone Generator](https://appshunter.io/ios/app/tone-generator/id1205284497)
- [Speak Unit](https://appshunter.io/ios/app/speak-unit/id1261498777)
- [Sandwich Sudoku Helper](https://appshunter.io/ios/app/sandwich-sudoku-helper/id1480982477)

All apps by Rick Peacock: https://appshunter.io/developer/286052385

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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 2026-08-24.*