Think and Grow Rich Offline
Books & Reference
Napoleon Hill's classic on success and wealth, readable fully offline.
Grindstone Studio · Independent app studio
Useful apps, carefully crafted.
We build simple, fast, privacy-respecting Android apps, from offline classic books to word games, and keep refining them until they are genuinely useful.
- Apps on Google Play
- 15+
- Downloads
- 500K+
- Countries & regions
- 200+
Featured apps
A good place to start
Classic books and book summaries that work offline, so you can read anywhere, even without mobile data.
Psychology of Money - Summary
Books & Reference
Key lessons from The Psychology of Money, summarised for offline reading.
The Law of Success - Offline
Books & Reference
Napoleon Hill's Law of Success lessons, readable fully offline.
As a Man Thinketh Offline
Books & Reference
James Allen's classic on how your thoughts shape your life, offline.
What we build
Three kinds of apps, one standard
Everything we publish is our own product, designed and coded in-house and refined with every update.
Classic books, offline
Timeless books on success, money and strategy, formatted for comfortable reading on a phone with no internet connection needed.
9 apps
Book summaries in your language
Unofficial chapter summaries of popular personal-finance and strategy books in Hindi, Punjabi, English and Indonesian.
5 apps
Word games & everyday apps
Light, fun apps for daily use: a vocabulary puzzle game and a library of shareable GIFs.
2 apps
Questions, feedback or a bug to report?
We read every message and reply within 2 business days. Tell us which app you're using and what happened, and we'll take it from there.