Principles In Action is a free app that brings to life Ray Dalio’s best-selling book Principles: Life & Work.  It combines the complete text of the book with behind-the-scenes video footage and interactive case studies of the principles in action at his company Bridgewater Associates.
Ray is one of the world’s most successful investors and entrepreneurs, and he’s sharing the unconventional principles that helped him create unique results in life and business because he believes they can help any person or organization better achieve their goals. 
In addition to the book and supporting cases, the app also includes:
* Daily principle from Ray to help you get more out of life
* Highlighted case-of-the-week and related principles 
* Search function across all content in the app, including the full set of principles 
* Digital “Coach” to help you easily find the appropriate principles for specific situations you face 
* Dedicated section in the app for you to highlight, favorite, develop and record your own and others’ principles 
* Additional content from Ray including studies on economics along with regular long form articles published on social media
Principles: Life & Work has been recommended by numerous leaders from all walks of life such as Bill Gates, Arianna Huffington, Marc Benioff, Mark Cuban, P. Diddy, Mike Bloomberg, Gwyneth Paltrow, Kevin Systrom, Jamie Dimon, and many others.

What’s New

Version 3.0.5

Welcome back! Principles in Action is continuously being updated with new content, features, and improvements to provide you with the best experience possible. Make sure you leave your updates on so you don’t miss a thing.
In this release you will see:

* All new landing page design to quickly access the latest information
* Updated cases interface
* New reading tab
* Access Coach from more places
* New Principles tab for quickly reviewing Ray’s principles and managing your own
* Improved stability and performance

Ratings and Reviews

4.9 out of 5
5.9K Ratings

5.9K Ratings

jphampst ,

Perfect mix of business and philosophy

In _Principles_, Dalio synthesizes business management, psychology (even neuroscience), and ethics in a rigorous way, based on decades running a large, successful organization.

It was startling to recognize the gap between the obvious wisdom of some of his principles (be upfront about your and others’ weaknesses) and how businesses actually tend to operate. The sections on identifying, testing, and sorting people were great, too.

Ultimately there are two ways most people and companies can benefit from the ideas in the book, I think. The first is by adopting idea-meritocratic and transparent values—it’s hard psychologically to make that leap but there aren’t that many other barriers. The second way is by transforming the organization so that every decision is highly data-driven (baseball cards, dot collector, etc)—I think operationally that way is harder to achieve and requires more resources to implement but the long-term benefits seem obvious, too.

SBear ,

Like app and ideas, but...

Great content. The multimedia aspect really enhances it. can’t export anything. All the principles I added and all the notes I made are stuck inside the app. For content you are supposed to use to grow and expand your life, this is a really big negative. So far, I haven’t found a way to work around it effectively.

The content and ideas are outstanding. Ray Dalio really has done a great job framing, clarifying and communicating his principles and other groundbreaking ideas. Having those ideas, and anything I add, stuck in the app is a huge limitation. I doubt Ray would like it if he was on this side....

Developer Response ,

Thank you for the feedback. Creating an export function for user generated content is currently on our product roadmap, so be on the lookout for it in future updates to the Principles in Action app. In the meantime, if you edit any of your notes or principles you can cut/paste from within the edit function.

Please note that you can submit feedback directly to our Product team, from within Principles In Action, by tapping the Question Mark icon, and then the Notepad icon in the top right.

joej4098 ,

Love the content - App is very buggy

This is great stuff but it is marred by the fact that many of the diagrams don’t show and the other multimedia features (videos etc) of the app just don’t work. Also I can’t save ”My Principles “. Lots to fix here. Also the app should lend itself much better to group reading where sone have the book and others have the app. The book’s principles are numbered and in the app they aren’t. Lots of fumbling around to get on the same page when some have the app and others have the book.

Developer Response ,

Thank you for the feedback. We are sorry that you are experiencing problems with the app. If you have not been able to resolve, please email our customer support team at and we will get fixed for you. Your request for changes to improve the group reading experience has been submitted to our Product team for future consideration. Please note that you can submit feedback directly to our Product team, from within Principles In Action, by tapping the Question Mark icon, and then the Notepad icon in the top right.


199.6 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Infrequent/Mild Profanity or Crude Humor
Infrequent/Mild Cartoon or Fantasy Violence


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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