Principle Mirror is the companion app to Principle for Mac, a tool for designing interactive interfaces. Principle Mirror can open Principle files from other apps or mirror Principle for Mac when plugged in.

“I just wanted to write to you quickly just to say — this. is. amazing. while I was watching the first tutorial I got tears in my eyes! seriously.”
Hugo Ahlberg
Designer, IDEO

"This tool is amazing, very well done."
Patrick Wong
Designer, Lyft

What's New

Version 4.1

Fixed scroll deceleration
Added Settings App preference to toggle Highlight Interactive Areas

Ratings and Reviews

3.5 out of 5

10 Ratings

10 Ratings

Scroll views in the latest update are broken on iPhone X


I would not recommend upgrading to version 4.1. Scroll views are not working correctly on iPhone X. It is unusable now as scroll views are the most common elements. And yes, yellow boxes should be part of a debugging mode not when you are presenting your prototype.
Please fix.

Good but not quite there


Good but not quite there. Include ability to test on Apple Watch, you’ll then have a fairly solid app.

Developer Response

Apple Watch does not allow display of custom layers like the kind that you create Principle; this makes it impossible to display Principle designs on an Apple Watch.

Update Issue- Yellow Boxes around Active Layers


Is anyone else getting yellow boxes around active layers?? It is driving me absolutely nuts! Hope you guys can fix asap.

It’s happening on both new and old projects, and seems to only happen in this latest updated version of Principle Mirror App.

I advise others not to update just yet.

Please fix!!

Developer Response

Update to version 4.1, which has the Highlight Interactive Areas feature turned off by default, and has a option in the settings app to toggle it.


Daniel Hooper
1.5 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Hooper Software LLC


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