Modern Master Key

Original Text + Focus Training

Free · In‑App Purchases · Designed for iPad

Study the original Master Key System with a modern reading option, focus sessions, reflections, highlights, and progress tools. 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

Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

Version 1.1 is a major content and study update. • Added a complete Modern Edition of The Master Key System, offering a clearer contemporary reading experience alongside the original text. • Added an Original/Modern reading toggle for supported lessons. • Improved study tools, including highlights, bookmarks, notes, Favorites Hub, and review support. • Enhanced the 24-week focus training workflow with better progress tracking and session flow. • Improved Apple Watch companion support and focus-session syncing. • Improved readability across Light, Dark, and System reading modes. • Fixed bugs and made general stability improvements.

Version 1.1

The developer, Hartshorne Works, LLC., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Hartshorne Works LLC
    Size
    • 7.2 MB
    Category
    • Books
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    • Apple Watch
      Requires watchOS 10.0 or later.
    Languages
    • English
    Age Rating
    9+
    In-App Purchases
    Yes
    • Modern Master Key Premium Monthly $3.99
    • Modern Master Key Premium Yearly $39.99
    • Learn More
    Copyright
    • © 2026 Hartshorne Works LLC
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More