# Music Factory - — Change key tempo and vocal

> App to change song key, tempo, and remove vocals. (iPhone/iPad app by KBIC International Ltd.)

- Source: https://appshunter.io/ios/app/music-factory/id509978677 (this page in markdown: same URL + `.md`)
- Developer: [KBIC International Ltd](https://appshunter.io/developer/505094094)
- Category: Music, Music, Entertainment
- Price: $2.99
- Rating: 2.09/5 from 33 App Store ratings · 44 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 1 MB
- Languages: English, Japanese
- Released: 2012-03-20
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/music-factory/id509978677/reviews.md

## What is Music Factory?

You can remove the vocal of a song, make a song faster or slower, and change the key of a song with this app!

The app is good for performers who cannot find the right music for their key, want a faster or slower version of the music, or cannot find the music of a song with no vocals.

And for others, it is just HILARIOUS to hear your favorite song in a different tempo or key!

Two simple steps in the app:
1. Select a song from your iTunes library
2. After the song is processed, you can then turn on and off vocals with the switch, change the speed and the pitch of the song with the sliders.

ZTX LE Time Stretch/Pitch Shift technology licensed from Zynaptiq GmbH, http://www.zynaptiq.com/ztx(c) Zynaptiq GmbH

## Key features

- Remove vocals
- Change song key
- Adjust tempo
- Select songs from iTunes
- Real-time processing

## Recent user reviews (10 of 44)

All indexed reviews: https://appshunter.io/ios/app/music-factory/id509978677/reviews.md

### 1/5 — Worthless

*2020-01-22, version 1.6*

Every song I try to put in this app is a DRM protected song. Should’ve bought two king size snickers instead of spending 3 bucks on this app.

### 1/5 — Waste of money

*2019-09-15, version 1.6*

Back a few years ago I told everyone about this app, today I still do but for a different reason. The dang app closes every stinking time you choose a new song. I spend more time opening it and finding a the song than I do playing. Very frustrating.

### 1/5 — DO NOT BUY!!!  DO NOT BUY!!!!!

*2019-07-29, version 1.6*

waste of money.  will crash all the time and i have the patience of Job.  no stars. developers r aware but obviously have done nothing.  if u click the prompt from the free version to the paid version IT WILL NOT WORK.  u must first delete the free app and install the paid version and pay for it to crash more than on the free version.  great idea, would be immensely musically helpful if it worked and if these developers paid attention to paying customers who have repeatedly told them to fix these two problems on reviews. But yet they continue to develop and request more ideas for additional apps prior to fixing those out there. i would say this a nickel and dime scam (that pockets them 1000’s of dollars) that needs to be investigated by authorities.

### 1/5 — Not good

*2019-03-11, version 1.6*

Not sure what DRM is, but prevents me from using this on a majority of my iTunes library.  Thankfully, it was only $3 bucks...I do not recommend this.

### 1/5 — Useless trash

*2019-03-10*

Absolutely garbage. It’ll let me open the app but once I select a song it takes me back to the home page

### 1/5 — This App No Longer Works

*2019-02-08, version 1.6*

I have the paid version of this app. It used to work great & would do everything I needed to to do. Sometime within the last several months it has stopped working properly. The app opens ok, but when I select a song to load the app immediately crashes. There is no functionality to it whatsoever. Frustrating to have this with an app I paid for. It looks like there have been no version updates in over a year. Would really appreciate an update that brings back all the functionality it used to have.

### 1/5 — Nope

*2019-01-25, version 1.6*

I was forced to buy the app a second time having accidentally deleting it. Now it won’t load songs because it crashes before it has a chance to. I deserve a refund. I’m beyond annoyed.

### 1/5 — But why?

*2019-01-07*

Have just purchased this app, it works for some of my music and not others, all songs I am trying are purchased, and downloaded (not on iCloud). Was excited but disappointed, what is wrong??

### 1/5 — Useless

*2018-12-26*

Purchased.  Unuseable.  Says all songs DRM protected.

### 3/5 — Music factory unstable

*2018-11-21, version 1.6*

The app worked great until I upgraded my iPhone to the 8. Now 95% of the time it won’t load songs. The app just crashes. Very frustrating. I removed it and reloaded it hoping that would work but it didn’t. I loved the app! Sad it doesn’t work now.

## Frequently asked questions about Music Factory

### What can this app do?

This application allows you to manipulate audio files from your iTunes library. You can remove the vocals from a song, adjust its playback speed (tempo), and change its musical key (pitch). It's designed for both practical musical adjustments and creative audio experimentation.

### How do I use the app to change a song?

Using the app is a straightforward two-step process. First, select a song from your iTunes library. Once the song is processed, you can then use simple controls to toggle vocals on or off, and adjust the speed and pitch using sliders.

### Is this app free to use?

Yes, the application is available for free. Based on the provided information, there are no in-app purchases or advertisements mentioned, suggesting a completely free user experience.

### Who would benefit from using this app?

Performers can benefit greatly by finding or creating music in their ideal key or tempo, or by obtaining instrumental versions of songs. It's also useful for anyone who wants to playfully alter their favorite songs for entertainment.

### What kind of technology does this app use?

The app utilizes ZTX LE Time Stretch/Pitch Shift technology, which is licensed from Zynaptiq GmbH. This technology is specifically designed for high-quality manipulation of audio speed and pitch.

## Version history (last 5 releases)

### 1.6 — 2017-10-08

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

Support for iOS 11
Faster file processing time

### 1.5 — 2014-02-19

Seek support added - User can now go to any part of the song with the new slider 

User interface optimized for iOS 7

### 1.4 — 2012-11-13

Added a "Back to Beginning" button

### 1.3.1 — 2012-05-25

Japanese Localization Added

### 1.3.0 — 2012-05-13

* App was previously crashing in devices running iOS 4. The issue is now fixed.

## Apps similar to Music Factory

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Nightcore Music Player](https://appshunter.io/ios/app/nightcore-music-player/id915898020) | 3.6 (52) | $9.99 | Music |
| [Winlive Synth Mobile](https://appshunter.io/ios/app/winlive-synth-mobile/id1530919680) | 4.0 (3) | $7.99 | Music |
| [Ludwig van Beethoven](https://appshunter.io/ios/app/ludwig-van-beethoven/id1509735310) | 4.3 (3) | $2.99 | Music |
| [Music Transpose: Key  Changer](https://appshunter.io/ios/app/music-transpose-key-changer/id1618175513) | 5.0 (5) | $24.99 | Music |
| [Song Vocal Remover - Music Ext](https://appshunter.io/ios/app/song-vocal-remover-music-ext/id6502993137) | 4.3 (4) | Free | Music |
| [Pretty Simple Music](https://appshunter.io/ios/app/pretty-simple-music/id6463053656) | — | Free | Music |

## More apps by KBIC International Ltd

- [Music Factory Lite -](https://appshunter.io/ios/app/music-factory-lite/id510346984)
- [Vocal Remover](https://appshunter.io/ios/app/vocal-remover/id518520239)
- [Vocal Remover Lite](https://appshunter.io/ios/app/vocal-remover-lite/id518520396)
- [Pitch Changer](https://appshunter.io/ios/app/pitch-changer/id518521577)
- [Pitch Changer Lite](https://appshunter.io/ios/app/pitch-changer-lite/id518521836)

All apps by KBIC International Ltd: https://appshunter.io/developer/505094094

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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.*