# 屈折度数 ORT.com vs NumberDrawApp

The clearest difference is review sentiment: 屈折度数 ORT.com at 100% against NumberDrawApp's 50%. 屈折度数 ORT.com also leads on ads (none vs shown). NumberDrawApp's advantage is price (Free vs $0.99) and update cadence (every 3 weeks vs every 39 months). On in-app purchases and device support there is nothing between them.

NumberDrawApp 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, NumberDrawApp every 3 weeks. The most recent releases landed on October 1, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 屈折度数 ORT.com | NumberDrawApp |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 39 months | **Every 3 weeks** |
| Monetization | Paid | **Ad-supported** |
| Size | 0 MB | 5 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [kohei yamane](https://appshunter.io/developer/1239055575) | [Kimihiro Harabuchi](https://appshunter.io/developer/667943948) |

## 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


### NumberDrawApp

[App page](https://appshunter.io/ios/app/numberdrawapp/id1672758276)

This utility app generates random numbers within a set range, ensuring no duplicates. It offers optional sound effects, image or text display on the results screen, and the ability to pause and resume draws. Users can also view past results and share them externally.

**Highlights:** Draws random numbers from a specified range, No duplicate numbers drawn, Optional sound effects, Image or text display on results, Pause and resume draw functionality, Draw results history, Share draw results

**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 NumberDrawApp free?

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

### Do 屈折度数 ORT.com or NumberDrawApp have ads?

NumberDrawApp shows ads; 屈折度数 ORT.com does not.

### Which is updated more often, 屈折度数 ORT.com or NumberDrawApp?

屈折度数 ORT.com ships an update every 39 months, and NumberDrawApp every 3 weeks. Most recently, 屈折度数 ORT.com was updated on October 1, 2026 and NumberDrawApp on October 2, 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.*