Modern Master Key

Modern Master Key brings Charles F. Haanel’s classic The Master Key System into a focused reading and study experience for today’s reader.

Read the complete original public-domain text free, including the introduction, glossary, and all 24 parts. Premium unlocks a complete Modern Edition of the text, plus guided study tools, focus sessions, reflections, highlights, notes, and progress tracking.

Move through the work at your own pace, or follow a structured 24-week study path designed to support consistent reading, reflection, and intentional practice.

About the Text

This app includes the public-domain text of The Master Key System by Charles F. Haanel, 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 an app-created reading version designed to make the material clearer and more accessible for contemporary readers.

Free Features

• Complete original 24-part text
• Introduction and glossary
• Universal search
• Reading progress tracking
• Weekly reminder controls

Optional Premium Features

• Complete Modern Edition for all 24 parts
• Original/Modern reading toggle
• Guided 24-week focus workflow
• Discipline Mode for structured progression
• Timed focus sessions and reflection tracking
• Highlights, bookmarks, notes, and Favorites Hub
• Spaced repetition review and export tools
• Key Takeaways
• Live Activity support for active focus sessions
• Apple Watch companion support

No medical, psychological, scientific, financial, 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