Modern Master Key

Modern Master Key provides mobile access to Charles F. Haanel's The Master Key System.

The complete core text is available free in the app. Premium is optional and adds structured study tools for readers who want more guidance.

### About

This app reproduces the public-domain text of The Master Key System, originally published beginning in 1912 and compiled in early 20th-century editions.

The text is based on historical source material and presented as faithful reading text.

Public-domain text in app:
- Lesson text (24 parts)
- Introduction
- Glossary

App-created features:
- Reading UI and navigation
- Universal search, progress, and reminder controls
- Highlights, bookmarks, and notes
- Focus session timers, streaks, badges, and reflection tools
- Spaced review and export utilities
- Live Activity support for active focus sessions
- Apple Watch companion support

### Free Features

- Complete 24-part core text
- Introduction and glossary
- Universal search
- Reading progress and weekly reminder controls

### Optional Premium Features

- Guided 24-week focus workflow
- Discipline Mode (structured progression)
- Timed focus sessions and reflection tracking
- Streaks, badges, and advanced focus progress metrics
- Study tools: bookmarks, highlights, notes, and Favorites Hub
- Spaced repetition review and export tools
- Key Takeaways

No medical, scientific, or guaranteed-outcome claims are made.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://modernmasterkey.com/privacy.html