Read the complete original public-domain text free. Premium unlocks a clearer modern reading edition, guided focus training, study tools, reflections, and progress tracking.
Original public-domain text by Charles F. Haanel, plus app-created modern reading and study tools.
The Master Key System is in the public domain, but most digital versions are hard to study consistently on modern devices. Modern Master Key keeps the original text intact and makes it easier to read, review, and move through the course over time.
Version 1.1 adds a complete Modern Edition for readers who want clearer contemporary language alongside the original wording. Premium also adds structured focus training, notes, highlights, reflections, and measurable progress tools.
This app reproduces the public-domain text of Charles F. Haanel's The Master Key System, originally published beginning in 1912 and compiled in early 20th-century editions.
The original text is preserved as historical source material. The Modern Edition is app-created reading content designed to make the material clearer and more accessible for contemporary readers.
Public-domain text: lessons, introduction, glossary. App-created content: Modern Edition, reading interface, highlights, notes, reminders, progress tracking, and guided training tools.
The complete original course is free to read. The historical source text is not locked behind premium.
Read all parts of the original 1912 course in one place.
Get context, terms, and structure before diving into each part.
Track where you are and continue your study without losing your place.
Premium is for readers who want the Modern Edition, guided study structure, saved notes, focus sessions, and review workflows.
Switch between the original wording and a clearer contemporary reading version.
A structured week-by-week path tied directly to the lesson exercises.
Timed focus sessions, optional reflections, and routine-building support.
Track streaks, completed weeks, focus minutes, and review readiness.
Read the original, switch to the Modern Edition, save what matters, and build a weekly study rhythm.
Click any screenshot to enlarge
Clear boundaries: the original book stays free, premium adds the Modern Edition and structured study tools.
| Feature | Free | Premium |
|---|---|---|
| Full original 24-part text | Yes | Yes |
| Introduction and glossary | Yes | Yes |
| Reading progress | Yes | Yes |
| Complete Modern Edition | No | Yes |
| Highlights, notes, bookmarks, and Favorites Hub | No | Yes |
| 24-week Focus Training program | No | Yes |
| Timed focus sessions and reflections | No | Yes |
| Streaks and advanced progress stats | No | Yes |
| Spaced repetition review tools | No | Yes |
The original text is never locked. Premium is optional and focused on modern reading and implementation.
Before any environment, successful or otherwise, can be created, action of some kind is necessary, and before any action is possible, there must be thought of some kind.- Charles F. Haanel, Part I
Modern Master Key is available on Google Play and the Apple App Store.
Download Modern Master Key on your preferred platform. For roadmap updates, you can still contact us directly.
Questions or feedback: features@modernmasterkey.com
Read the original public-domain text free, then choose premium if you want the Modern Edition and guided practice tools.