# Principle Mirror vs Nydhei

The clearest difference is review sentiment: Nydhei at 100% against Principle Mirror's 45%. Nydhei also leads on rating (5.0 vs 4.2) and update cadence (monthly vs every 2 months). Principle Mirror's advantage is in-app purchases (none vs 3) and ratings volume (14 vs 2). On price and ads there is nothing between them.

Both are free to download. Nydhei sells 3 in-app purchases, starting at $4.99 per month. Principle Mirror asks for nothing beyond the download.

Nydhei holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Principle Mirror has 14 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 45% of Principle Mirror's written reviews are positive against 100% of Nydhei's.

Principle Mirror ships an update every 2 months, Nydhei monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Principle Mirror | Nydhei |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (14 ratings)](https://appshunter.io/ios/app/principle-mirror/id991911319/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/nydhei-private-visual-planner/id6785560824/reviews)** |
| Number of ratings | **14** | 2 |
| Positive reviews | 45.2% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 1 MB | 77 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Hooper](https://appshunter.io/developer/419502228) | [NYDHEI LLC](https://appshunter.io/developer/6785560826) |

## 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


### Nydhei

[App page](https://appshunter.io/ios/app/nydhei-private-visual-planner/id6785560824)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Yearly | $39.99 | per year |
| Creator Pack | $1.99 | one-time |


## Frequently asked questions

### Is Principle Mirror free?

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

### Is Nydhei free?

Nydhei is free to download, with in-app purchases available.

### Which has better reviews, Principle Mirror or Nydhei?

Nydhei is rated higher. Principle Mirror averages 4.2 out of 5 from 14 ratings, while Nydhei averages 5.0 from 2 ratings.

### Do Principle Mirror or Nydhei have ads?

Neither Principle Mirror nor Nydhei shows ads.

### Which is updated more often, Principle Mirror or Nydhei?

Principle Mirror ships an update every 2 months, and Nydhei monthly. Most recently, Principle Mirror was updated on October 24, 2026 and Nydhei on October 24, 2026.

---

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