# 屈折度数 ORT.com vs HELLO! MUSEUM

The clearest difference is price: HELLO! MUSEUM at Free against 屈折度数 ORT.com's $0.99. HELLO! MUSEUM also leads on update cadence (every 5 weeks vs every 39 months) and iOS requirement (17.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

HELLO! MUSEUM is free to download; 屈折度数 ORT.com costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

屈折度数 ORT.com ships an update every 39 months, HELLO! MUSEUM every 5 weeks. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 屈折度数 ORT.com | HELLO! MUSEUM |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 5 weeks** |
| Monetization | Paid | — |
| Size | 0 MB | 2 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [kohei yamane](https://appshunter.io/developer/1239055575) | [Evixar Inc.](https://appshunter.io/developer/882691720) |

## What reviewers say

### 屈折度数 ORT.com

[App page](https://appshunter.io/ios/app/ortcom/id1400812675)

This app visualizes refractive errors, from power cross to image formation diagrams. It instantly calculates and displays the main and weak axes of astigmatism, simulates image formation on the retina, and helps distinguish between different types of astigmatism. Ideal for students and professionals in vision training.

**Highlights:** Instant calculation of main and weak astigmatism axes, Visual power cross display, Image formation diagram simulation, Distinguishes astigmatism types, Simple and speedy operation, Ideal for vision training students and professionals

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### HELLO! MUSEUM

[App page](https://appshunter.io/ios/app/hello-museum/id6761349645)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 屈折度数 ORT.com free?

屈折度数 ORT.com costs $0.99, with no in-app purchases.

### Is HELLO! MUSEUM free?

HELLO! MUSEUM is free to download, with no in-app purchases.

### Do 屈折度数 ORT.com or HELLO! MUSEUM have ads?

Neither 屈折度数 ORT.com nor HELLO! MUSEUM shows ads.

### Which is updated more often, 屈折度数 ORT.com or HELLO! MUSEUM?

屈折度数 ORT.com ships an update every 39 months, and HELLO! MUSEUM every 5 weeks. Most recently, 屈折度数 ORT.com was updated on October 1, 2026 and HELLO! MUSEUM on October 5, 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.*