# Principle Mirror vs ProtoPie Player

The clearest difference is rating: Principle Mirror at 4.2 against ProtoPie Player's 4.0. Principle Mirror also leads on monetization model (free vs ad-supported) and iOS requirement (11.0 vs 16.2). ProtoPie Player's advantage is review sentiment (58% vs 45%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Principle Mirror holds the better App Store score, 4.2 against 4.0. Both are backed by a comparable volume of ratings — 14 and 27 respectively. Written reviews complicate that: 45% of Principle Mirror's written reviews are positive against 58% of ProtoPie Player's, so the app with the better star average is not the one people write more warmly about.

Principle Mirror ships an update every 2 months, ProtoPie Player every 5 weeks. The most recent releases landed on September 19, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Principle Mirror | ProtoPie Player |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (14 ratings)](https://appshunter.io/ios/app/principle-mirror/id991911319/reviews)** | [4.0 (27 ratings)](https://appshunter.io/ios/app/protopie-player/id1015837511/reviews) |
| Number of ratings | 14 | **27** |
| Positive reviews | 45.2% of reviews | **58.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 66 MB |
| Requires iOS | **11.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Hooper](https://appshunter.io/developer/419502228) | [Studio XID](https://appshunter.io/developer/1015837510) |

## What reviewers say

### Principle Mirror

[App page](https://appshunter.io/ios/app/principle-mirror/id991911319)

Design interactive user interfaces with this companion app for a popular Mac design tool. Seamlessly open Principle files or mirror your Mac's design work directly to your device.

**Highlights:** Open Principle files, Mirror Principle for Mac, Interactive UI design, Companion app functionality

**Features:** Vision Pro support

**In-app purchases:** none


### ProtoPie Player

[App page](https://appshunter.io/ios/app/protopie-player/id1015837511)

This app allows you to view, test, and experience interactive prototypes created with a companion desktop tool. Access prototypes from the cloud or save them locally for offline use on your mobile devices. It enables easy sharing and testing of designs with colleagues, clients, or users.

**Highlights:** View and test prototypes, Access cloud prototypes, Save prototypes locally, Use native device capabilities, Control playback speed, Share prototypes easily

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Principle Mirror free?

Principle Mirror is free to download, with no in-app purchases.

### Is ProtoPie Player free?

ProtoPie Player is free to download, with no in-app purchases.

### Which has better reviews, Principle Mirror or ProtoPie Player?

Principle Mirror is rated higher. Principle Mirror averages 4.2 out of 5 from 14 ratings, while ProtoPie Player averages 4.0 from 27 ratings.

### Do Principle Mirror or ProtoPie Player have ads?

Neither Principle Mirror nor ProtoPie Player shows ads.

### Which is updated more often, Principle Mirror or ProtoPie Player?

Principle Mirror ships an update every 2 months, and ProtoPie Player every 5 weeks. Most recently, Principle Mirror was updated on September 19, 2026 and ProtoPie Player on September 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*