# Pupillary Distance Ruler — Measure eyes with TrueDepth

> iPhone app to measure interpupillary distance using TrueDepth camera sensors. (iPhone/iPad app by Krueger Systems, Inc..)

- Source: https://appshunter.io/ios/app/pupillary-distance-ruler/id6752308010 (this page in markdown: same URL + `.md`)
- Developer: [Krueger Systems, Inc.](https://appshunter.io/developer/299293363)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 4.00/5 from 3 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 2 MB
- Languages: American English
- Released: 2025-09-25
- Data updated: 2026-08-27
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/pupillary-distance-ruler/id6752308010/reviews.md

## What is Pupillary Distance Ruler?

Measure your interpupillary distance (IPD / PD) in seconds using the same advanced TrueDepth sensors that power Face ID.

No rulers, no mirrors, no accounts, no guesswork. Just accurate results you can trust: perfect for ordering glasses online, setting up VR headsets, or keeping track of your family’s vision.

Why Choose This App?
* Advanced Sensor Accuracy
* Uses the iPhone’s TrueDepth camera to calculate your eye centers in 3D space, far more precise than a ruler and mirror.
* Safe and Private: Your face never leaves your device. No cloud, no servers, no tracking. The app uses Apple’s secure ARKit APIs and stores only the results you choose to keep.
* Simple and Fast: Hold your iPhone in front of you, follow the on-screen guide, and get your PD in less than 10 seconds.

Free Features
* Quick PD measurement (distance PD)
* Live camera guidance with stability detection
* One-tap result in millimeters
* Educational tips on why PD matters for glasses and VR

Pro Features (In-App Purchase)
* Advanced Accuracy Mode: more samples, smarter outlier rejection, and a confidence interval with every result
* Monocular PD: measure left and right eyes separately — critical for VR headset alignment and premium glasses
* History & Profiles: save multiple results over time, track growth in kids, or measure friends and family
Export & Share: generate a professional PDF report or share your results instantly with your optician

Who It’s For
* Anyone ordering glasses online who doesn’t know their PD
* VR enthusiasts looking for the sharpest, most comfortable headset fit
* Parents who want to measure and track their children’s PD as they grow
* Optics hobbyists and tech lovers who want to see what the iPhone’s sensors can really do

Privacy First
* We believe your face belongs to you.
* 100% on-device processing
* No photos, meshes, or videos are stored
* No logins or accounts
* Only the numerical results you choose to save remain on your device

Why Pay?
* Opticians may charge $20–$40 for a PD measurement. This app gives you accurate, repeatable results for a fraction of the cost: anytime, anywhere.

Download today and see your eyes in a whole new way.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Yearly Subscription | $5.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Forever | $9.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/pupillary-distance-ruler/id6752308010/reviews.md

### 2/5 — Measures 3 mm lower than lens store

*2026-03-01*

I’m not sure I trust the accuracy. It varied quite a bit measuring anywhere from 1 mm less to 3 mm less than with a lens store measured

### 5/5 — Brilliant

*2025-09-29*

Works as advertised, appreciate privacy first approach.

## Frequently asked questions about Pupillary Distance Ruler

### What is Pupillary Distance Ruler?

Pupillary Distance Ruler is an iPhone application that uses the device's TrueDepth camera sensors to measure your interpupillary distance (PD). This measurement is crucial for ordering prescription glasses and optimizing VR headset fit.

### How accurate is Pupillary Distance Ruler?

The app leverages advanced TrueDepth sensors for precise 3D measurements, offering greater accuracy than traditional ruler and mirror methods. Pro features enhance accuracy further with more samples and outlier rejection.

### Is Pupillary Distance Ruler free to use?

Yes, the core functionality of measuring distance PD is available for free. Advanced features like monocular PD, history saving, and PDF export require a Pro upgrade through an in-app purchase.

### What are the Pro features of Pupillary Distance Ruler?

Pro features include Advanced Accuracy Mode for more precise readings, Monocular PD to measure each eye separately, History & Profiles to save multiple measurements, and Export & Share functionality for PDF reports.

### Is my data safe with Pupillary Distance Ruler?

Yes, the app prioritizes privacy with 100% on-device processing. Your face data never leaves your device, and no photos, meshes, or videos are stored. Only the numerical results you choose to save are kept locally.

### What devices support Pupillary Distance Ruler?

Pupillary Distance Ruler is supported on iPhones and iPads that are equipped with TrueDepth camera sensors, which are necessary for the app's core measurement functionality.

### How often is Pupillary Distance Ruler updated?

The app was last updated on September 25, 2025, with version 1.0. Future updates will likely focus on improving accuracy, adding new features, and ensuring compatibility with the latest iOS versions.

### What is the age rating for Pupillary Distance Ruler?

Pupillary Distance Ruler has an age rating of 4+. This indicates it is suitable for users aged 4 and above, with no specific content concerns.

## Version history (last 1 release)

### 1.0 — 2025-09-25

No release notes.

## Apps similar to Pupillary Distance Ruler

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Pupillary Distance measure PD](https://appshunter.io/ios/app/pupillary-distance-measure-pd/id6473115256) | 4.6 (21) | Free | Health & Fitness |
| [Pupil Distance Meter - Eye PD](https://appshunter.io/ios/app/pupil-distance-meter-eye-pd/id1638731689) | 4.6 (585) | Free | Health & Fitness |
| [PDCheck AR](https://appshunter.io/ios/app/pdcheck-ar/id1563806777) | 4.9 (3,803) | Free | Health & Fitness |
| [Opthy](https://appshunter.io/ios/app/opthy/id1624663408) | 4.5 (2,938) | Free | Health & Fitness |
| [PD+ : Easy Pupillary Distance](https://appshunter.io/ios/app/pd-plus-easy-pupillary-distance/id1560353383) | 4.7 (509) | Free | Health & Fitness |
| [Pupillary Distance Measure: PD](https://appshunter.io/ios/app/pupillary-distance-measure-pd/id6744676227) | 4.6 (86) | Free | Health & Fitness |

## More apps by Krueger Systems, Inc.

- [iCircuit](https://appshunter.io/ios/app/icircuit/id383359044)
- [Live Spectrogram](https://appshunter.io/ios/app/live-spectrogram/id630831185)
- [Math Agility](https://appshunter.io/ios/app/math-agility/id632744606)
- [Calca](https://appshunter.io/ios/app/calca/id635757879)
- [Mocast](https://appshunter.io/ios/app/mocast/id897185985)
- [Continuous .NET C# and F# IDE](https://appshunter.io/ios/app/continuous-net-c-and-f-ide/id1095213378)

All apps by Krueger Systems, Inc.: https://appshunter.io/developer/299293363

## Related topics

[pupillary distance ruler](https://appshunter.io/ios/topics/pupillary-distance-ruler) · [pd ruler](https://appshunter.io/ios/topics/pd-ruler) · [pupil distance pd measure](https://appshunter.io/ios/topics/pupil-distance-pd-measure) · [pupil distance meter](https://appshunter.io/ios/topics/pupil-distance-meter)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*