# The Master Key System - audio — sync narration, meditation

> Audiobook and interactive guide to personal development principles. (iPhone/iPad app by Huong Nguyen.)

- Source: https://appshunter.io/ios/app/the-master-key-system-audio/id1380717052 (this page in markdown: same URL + `.md`)
- Developer: [Huong Nguyen](https://appshunter.io/developer/1342162705)
- Category: Entertainment, Education
- Price: Free with in-app purchases
- Rating: 3.30/5 from 7 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 49 MB
- Languages: American English
- Released: 2018-05-16
- Data updated: 2026-08-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/the-master-key-system-audio/id1380717052/reviews.md

## What is The Master Key System?

This app combines "The Master Key System", a personal development book by Charles F. Haanel with professional human narration. 

The book describes many New Thought beliefs such as the law of attraction, creative visualization and man's unity with God, and teaches the importance of truth, harmonious thinking and the ability to concentrate.

Each of the 24 chapters contains an introduction, followed by a sequentially numbered section which includes an exercise towards the end, followed by a section with questions and answers.

Each chapter ends with an exercise which the reader is encouraged to undertake every day for the following 4–7 days. The exercises are meditations that require the reader to first sit comfortably in a chair.

The ideas behind the book mainly come from New Thought philosophy, but there are influences from other sources such as Hinduism, Masonic and Rosicrucian teachings, Theosophy, and the Bible.

Benefits of sync audio feature: 
● a valuable tool for people affected by reading disorders and dyslexia
● a useful tool for kids to learn reading or for people to learn a foreign language
● allowing everybody to enjoy their favourite book by reading, listening or reading+listening

● Long press a word and tap "Play" to activate sync narration

You can both read and listen to your favorite book. 
The app will highlight the sentence being narrated so that you can follow along as the words are read aloud.


Thanks to sync narration feature, you can change from reading to listening or vice versa easily. 


● other features: 
- change font size and style 
- night and day reading mode
- highlight text
- Audio play in background (you can listen to the audio, while using other apps) 


● If you want to give feedback, please use the feedback feature in the settings

## Key features

- Synchronized audio narration
- Chapter exercises and Q&A
- Adjustable font size and style
- Night and day reading modes
- Background audio playback
- Text highlighting

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All | $0.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/the-master-key-system-audio/id1380717052/reviews.md

### 1/5 — Faulty

*2021-08-10*

Does not work

### 1/5 — Major copyright violations

*2020-06-17*

This same audio book (in its entirety) is available on Audible for $1.00!!!!! 

I cant believe someone had the nerve to just steal material!!

### 1/5 — Doesn’t Work

*2020-06-16*

Just crashes. Can’t open any chapters without app crashing

### 4/5 — Minor bug

*2020-04-23*

Great app, works on iPad however the synched audio feature crashes on my iPhone. Sent an email and I’m sure the developer will fix this problem. Thanks again.

Edit: The narrator is Philip Ives.

## Frequently asked questions about The Master Key System

### What is The Master Key System audio app?

The Master Key System audio app offers an audio narration of the personal development book by Charles F. Haanel. It combines reading with listening, highlighting text as it's narrated.

### Does The Master Key System audio app have ads?

No, The Master Key System audio app is ad-free, allowing for an uninterrupted learning experience.

### What are the benefits of the sync narration feature?

The sync narration feature is beneficial for individuals with reading disorders, dyslexia, or those learning a new language. It allows users to read, listen, or do both simultaneously.

### Can I listen to the audio while using other apps?

Yes, the app supports background audio playback, enabling you to listen to the narration while using other applications on your device.

### What kind of content does The Master Key System cover?

The content is based on New Thought philosophy, covering principles such as the law of attraction, creative visualization, and the unity with God, along with practical exercises and Q&A.

### What devices is The Master Key System audio app available on?

The app is supported on iPhone, iPad, and iPod devices.

### How often is The Master Key System audio app updated?

The app was last updated on May 16, 2018, with version 1.0. There have been no subsequent updates listed.

### What is the user rating for The Master Key System audio app?

The app has a rating of 3.3 stars based on 7 user ratings.

## Version history (last 1 release)

### 1.0 — 2018-05-16

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

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## More apps by Huong Nguyen

- [Spanish Etymology Dictionary](https://appshunter.io/ios/app/spanish-etymology-dictionary/id1342162706)
- [Mastering French Synonyms](https://appshunter.io/ios/app/mastering-french-synonyms/id1342502036)
- [Spanish Word Origins](https://appshunter.io/ios/app/spanish-word-origins/id1347532848)
- [Mastering English Prepositions](https://appshunter.io/ios/app/mastering-english-prepositions/id1352786356)
- [Medical Roots Dictionary](https://appshunter.io/ios/app/medical-roots-dictionary/id1361041693)
- [Think and grow rich - original](https://appshunter.io/ios/app/think-and-grow-rich-original/id1363948310)

All apps by Huong Nguyen: https://appshunter.io/developer/1342162705

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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 2026-08-18.*