# PD+ vs Opthy

The clearest difference is review sentiment: PD+ at 54% against Opthy's 13%. PD+ also leads on rating (4.7 vs 4.5). Opthy's advantage is in-app purchases (none vs 1) and ratings volume (3K vs 555). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. PD+ sells 1 one-off in-app purchase. Opthy asks for nothing beyond the download.

PD+ holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Opthy has 3K ratings behind it against 555, so its average is the more settled of the two. Written reviews point the same way: 54% of PD+'s written reviews are positive against 13% of Opthy's.

PD+ ships an update every 2 months, Opthy monthly. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | PD+ | Opthy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (555 ratings)](https://appshunter.io/ios/app/pd-plus-easy-pupillary-distance/id1560353383/reviews)** | [4.5 (3K ratings)](https://appshunter.io/ios/app/opthy/id1624663408/reviews) |
| Number of ratings | 555 | **3K** |
| Positive reviews | **54.2% of reviews** | 13.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 76 MB | 217 MB |
| Requires iOS | 17.6 | **14.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Zernike LLC](https://appshunter.io/developer/1636196510) | [Luxottica Group SPA](https://appshunter.io/developer/426128459) |

## What reviewers say

### PD+

[App page](https://appshunter.io/ios/app/pd-plus-easy-pupillary-distance/id1560353383)

This app measures pupillary distance (PD) and fitting heights using your device's camera. It offers various optical calculators for lens adjustments and acuity estimations. Accurate measurements are crucial for optimal lens centering and multifocal lens positioning.

**Highlights:** Pupillary distance measurement, Fitting height measurement, Binocular and monocular PD, Rx transposition calculator, Vertex adjustment calculator, Crossed cylinders calculator, Minimum blank size calculator

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Subscription | $7.99 | one-time |

**What reviewers like**

- 👍 Easy and quick measurement
- 💡 Clever and innovative app
- ⭐ Highly accurate measurements
- 👍 Friendly and easy to use
- 🗣️ Voice instructions included

**What reviewers complain about**

- 📉 Unstable measurements
- ❓ Measurement inconsistency
- ❌ Inaccurate PD readings
- 🤔 Measurements not trustworthy
- 📏 PD off by several mm

**Reported bugs**

- Face size unstable
- Camera distance sensitive
- App keeps crashing
- PD feature doesn't work on iPad
- Page stays black on iPad

**Requested features**

- Can this app measure the PD for progressive lenses for right and left eyes?


### 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


## Frequently asked questions

### Is PD+ free?

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

### Is Opthy free?

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

### Which has better reviews, PD+ or Opthy?

PD+ is rated higher. PD+ averages 4.7 out of 5 from 555 ratings, while Opthy averages 4.5 from 3K ratings.

### Do PD+ or Opthy have ads?

Neither PD+ nor Opthy shows ads.

### Which is updated more often, PD+ or Opthy?

PD+ ships an update every 2 months, and Opthy monthly. Most recently, PD+ was updated on October 27, 2026 and Opthy on October 30, 2026.

---

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