MODERN
MASTER KEY
Unlock Your Potential with Charles F. Haanel's Complete Course
The timeless 1912 personal development classic — beautifully redesigned for iOS.
Coming Soon to the App Store
The timeless 1912 personal development classic — beautifully redesigned for iOS.
Coming Soon to the App StoreFirst published in 1912, The Master Key System by Charles F. Haanel is one of the most influential personal development courses ever written. Originally distributed as a 24-week correspondence course, it has inspired generations of readers seeking to unlock their mental potential.
This isn't just another self-help book — it's a complete system. Each of the 24 parts builds upon the last, teaching principles of thought, concentration, and personal power through practical exercises you can apply immediately.
Now experience this timeless classic in a beautifully designed iOS app — completely free.
The complete Master Key System, beautifully presented — no subscriptions, no paywalls, no ads.
Every word of the original 1912 text, including all prefaces, introductions, lessons, questions, and quotes.
Search across all 24 parts instantly. Found keywords are highlighted in yellow so you can find exactly what you need.
Mark lessons complete and see your journey through the 24-week course at a glance.
Read comfortably any time of day with beautiful light and dark themes.
Dynamic Type support means the text adapts to your preferred reading size.
Each day brings a new rotating quote from the Master Key System to keep you inspired.
We're constantly working on new features based on your feedback.
Highlight your favorite passages and add personal notes to deepen your study.
Listen to professional narration of each lesson. Perfect for your commute.
Set daily reminders to maintain your study habit and build streaks.
Track your reading patterns and visualize your 24-week transformation.
Built-in timer for the mental exercises in each part.
The same timeless wisdom rewritten in contemporary language.
Have a feature request?
features@modernmasterkey.com
A clean, distraction-free reading experience designed for focused study.
Click any screenshot to enlarge
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
When Charles F. Haanel first published The Master Key System in 1912, he could never have imagined the millions of lives it would touch. Business leaders, entrepreneurs, and seekers of personal growth have turned to these 24 lessons for guidance and inspiration.
The course influenced countless readers, including Napoleon Hill, who credited it as foundational to his work "Think and Grow Rich."
Modern Master Key brings this classic into the 21st century, making it accessible to a new generation while preserving every word of Haanel's original wisdom.
The complete Master Key System. 24 transformative lessons. Completely free.
Coming Soon to the App Store