# 屈折度数 ORT.com vs Plus

The clearest difference is review sentiment: 屈折度数 ORT.com at 100% against Plus's 0%. 屈折度数 ORT.com also leads on ads (none vs shown). Plus's advantage is price (Free vs $0.99) and update cadence (every 2 weeks vs every 39 months). On in-app purchases and device support there is nothing between them.

Plus 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, Plus every 2 weeks. The most recent releases landed on October 17, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 屈折度数 ORT.com | Plus |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[3.3 (3 ratings)](https://appshunter.io/ios/app/plus-sizing-tire-pressure-calc/id6741032949/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 39 months | **Every 2 weeks** |
| Monetization | Paid | **Ad-supported** |
| Size | 0 MB | 17 MB |
| Requires iOS | 26.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [kohei yamane](https://appshunter.io/developer/1239055575) | [Hidenori Nakashima](https://appshunter.io/developer/1566865415) |

## 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


### Plus

[App page](https://appshunter.io/ios/app/plus-sizing-tire-pressure-calc/id6741032949)

Calculate optimal tire pressure for your vehicle based on selectable tire standards and pressure units. Proper inflation enhances performance, prevents flats, saves fuel, and supports sustainability goals.

**Highlights:** Selectable tire standards (XL, RFD, ETRTO, TRA, JATMA), Switchable pressure units (kPa, bar, kg/cm2, psi), Optimize tire performance, Prevent flat tires, Save fuel, Support SDGs 12 and 13

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

**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 Plus free?

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

### Do 屈折度数 ORT.com or Plus have ads?

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

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

屈折度数 ORT.com ships an update every 39 months, and Plus every 2 weeks. Most recently, 屈折度数 ORT.com was updated on October 17, 2026 and Plus on October 10, 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.*