# Principle Mirror — Interaction & UI Design

> Companion app for Principle for Mac, enabling interactive UI design and mirroring. (iPhone/iPad app by Daniel Hooper.)

- Source: https://appshunter.io/ios/app/principle-mirror/id991911319 (this page in markdown: same URL + `.md`)
- Developer: [Daniel Hooper](https://appshunter.io/developer/419502228)
- Category: Productivity, Utilities
- Price: Free
- Rating: 4.20/5 from 14 App Store ratings · 42 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 1 MB
- Languages: American English
- Released: 2015-08-31
- Data updated: 2026-08-15
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/principle-mirror/id991911319/reviews.md

## What is Principle Mirror?

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

## Key features

- Open Principle files
- Mirror Principle for Mac
- Interactive UI design
- Companion app functionality

## Recent user reviews (10 of 42)

All indexed reviews: https://appshunter.io/ios/app/principle-mirror/id991911319/reviews.md

### 1/5 — iOS 18 doesn't working...

*2024-09-18, version 5.5*

The app doesn't work on iOS 18. The mirror just doesn't see the opened file even though the iPhone is connected to Mac.

### 1/5 — HOW TO PLUG IN A DEVICE?!

*2021-04-06*

didn't get how to plug in a device, found no info about this neither in the app, nor on the official website, great ux/ui, bravo 👏🥲

### 3/5 — Works great but doesn’t work over WiFi

*2020-07-04*

Pretty frustrating since most apple laptops don’t have a USB port anymore. It would be great to support over WiFi

### 2/5 — Please fix “open in principle” integration with Safari

*2020-04-15*

If I want to share a .prd file with someone to test a prototype they are unable to open the file in their Principle app. I want to share a link to the .prd via Dropbox. But when they download the file on mobile safari and tap “Open with Principle” under share, the file does not open. Impossible to share prototypes with team or testers.

### 1/5 — Doesn’t work

*2020-02-25*

Probably worked in the past. Only freezes and crashes now. Fix your app

### 1/5 — iOS13

*2019-09-27*

Since iOS 13 update, I'm unable to reset my prototype with a 3 fingers tap

### 5/5 — Wonderfull

*2019-09-20, version 5.3*

Wonderful app

### 2/5 — No Wireless connection

*2019-09-18*

This app doesn’t allow you to connect your designs via Bluetooth. Now that Mac’s are using less cables and more wireless connections it makes it very difficult to view designs on mobile. 
I’ve had this app for some time and have expected to see this improvement, but still waiting...

### 3/5 — Keeps crashing

*2019-08-19*

When I first downloaded this app it worked great with small projects. Now that I’m working on a larger prototype the app crashes within seconds of mirroring the file. This is quite frustrating - please fix this!

### 1/5 — Wifi

*2019-06-19*

Doesn’t work via wifi

## Frequently asked questions about Principle Mirror

### What does Principle Mirror do?

Principle Mirror is a companion application designed to work with Principle for Mac. It allows you to open Principle design files directly on your device or mirror the design process from your Mac in real-time.

### How can I use Principle Mirror with Principle for Mac?

You can use Principle Mirror to open Principle files that you've saved or shared. Additionally, when your Mac is plugged in, the app can mirror the interactive interface designs you are creating in Principle for Mac directly onto your device.

### Is Principle Mirror a free app?

Yes, Principle Mirror is available for free. There are no in-app purchases or advertisements mentioned, indicating it is a complimentary tool for users of Principle for Mac.

### What are the main benefits of using Principle Mirror?

The primary benefit is the ability to view and interact with your Principle designs on a mobile device, either by opening files or by mirroring your Mac's screen. This is invaluable for testing and showcasing interactive UI designs.

## Version history (last 5 releases)

### 5.6 — 2025-06-04

Bug fixes

### 5.5 — 2023-02-18

Bug fixes

### 5.4 — 2021-11-17

Bug fixes

### 5.3 — 2019-09-18

Support for iOS 13

### 5.2 — 2018-12-18

Bug Fixes and Performance Improvements

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| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [ProtoPie Player](https://appshunter.io/ios/app/protopie-player/id1015837511) | 4.0 (27) | Free | Productivity |

## More apps by Daniel Hooper

- [Percepto](https://appshunter.io/ios/app/percepto/id419502225)

All apps by Daniel Hooper: https://appshunter.io/developer/419502228

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*