# Opthy vs Pupillary Distance Ruler

The clearest difference is review sentiment: Pupillary Distance Ruler at 50% against Opthy's 13%. Opthy's advantage is in-app purchases (none vs 2) and rating (4.5 vs 4.0). On price, ads and device support there is nothing between them.

Both are free to download. Pupillary Distance Ruler sells 2 in-app purchases, starting at $5.99 per year. Opthy asks for nothing beyond the download.

Opthy holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Opthy has 3K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 13% of Opthy's written reviews are positive against 50% of Pupillary Distance Ruler's, so the app with the better star average is not the one people write more warmly about.

## The numbers

| Metric | Opthy | Pupillary Distance Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (3K ratings)](https://appshunter.io/ios/app/opthy/id1624663408/reviews)** | [4.0 (3 ratings)](https://appshunter.io/ios/app/pupillary-distance-ruler/id6752308010/reviews) |
| Number of ratings | **3K** | 3 |
| Positive reviews | 13.2% of reviews | **50.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | — |
| Monetization | **Free** | Free with in-app purchases |
| Size | 217 MB | 2 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Luxottica Group SPA](https://appshunter.io/developer/426128459) | [Krueger Systems, Inc.](https://appshunter.io/developer/299293363) |

## What reviewers say

### Opthy

[App page](https://appshunter.io/ios/app/opthy/id1624663408)

Measure your Pupillary Distance (PD) accurately with this app, leveraging advanced technology for personalized glasses fitting. It transforms your iPhone into a measurement device, enabling confident online prescription glasses purchases.

**Highlights:** Contactless PD measurement, Quick IPD for far vision, Order prescription glasses online, iPhone 3D body scanner, Personalized fit for glasses

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Quick and easy
- 📐 Accurate measurements
- 🤖 Clear instructions

**What reviewers complain about**

- 🤔 Inconsistent results
- 🤯 Difficult to use
- 🕰️ Time-consuming process
- 🔍 Lighting issues
- 🤖 Unreliable app

**Reported bugs**

- App crashes or freezes
- Face not detected despite proper lighting
- Incompatible with certain devices

**Requested features**

- Voice guidance for instructions
- Progress indicator during measurement
- Ability to save and view past measurements


### Pupillary Distance Ruler

[App page](https://appshunter.io/ios/app/pupillary-distance-ruler/id6752308010)

Accurately measure your interpupillary distance (PD) using advanced iPhone sensors. Get precise results in seconds for ordering glasses, setting up VR, or tracking vision. Offers both free basic measurements and advanced pro features via in-app purchase.

**Highlights:** TrueDepth sensor accuracy, Fast, no-guesswork measurements, Free basic PD measurement, Pro features via in-app purchase, History and profile saving, PDF report export

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Yearly Subscription | $5.99 | per year |
| Pro Forever | $9.99 | one-time |


## Frequently asked questions

### Is Opthy free?

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

### Is Pupillary Distance Ruler free?

Pupillary Distance Ruler is free to download, with in-app purchases available.

### Which has better reviews, Opthy or Pupillary Distance Ruler?

Opthy is rated higher. Opthy averages 4.5 out of 5 from 3K ratings, while Pupillary Distance Ruler averages 4.0 from 3 ratings.

### Do Opthy or Pupillary Distance Ruler have ads?

Neither Opthy nor Pupillary Distance Ruler shows ads.

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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.*