# Interpupillary Distance Meter vs Pupil Detection

The clearest difference is price: Pupil Detection at Free against Interpupillary Distance Meter's $0.99. Pupil Detection also leads on update cadence (every 2 weeks vs every 43 months). Interpupillary Distance Meter's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Pupil Detection is free to download; Interpupillary Distance Meter costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Interpupillary Distance Meter ships an update every 43 months, Pupil Detection every 2 weeks. The most recent releases landed on November 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Interpupillary Distance Meter | Pupil Detection |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.6 (514 ratings)](https://appshunter.io/ios/app/interpupillary-distance-meter/id1481753106/reviews)** | — |
| Number of ratings | **514** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 43 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 36 MB |
| Requires iOS | **17.6** | 17.7.2 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Ubicolor Ltd](https://appshunter.io/developer/828691698) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Interpupillary Distance Meter

[App page](https://appshunter.io/ios/app/interpupillary-distance-meter/id1481753106)

Quickly measure your inter pupillary distance using your iPhone or iPad. Achieve highly accurate results to 0.1mm for both near and far pupil distances. The app features large text for readability and supports dark mode.

**Highlights:** Accurate IPD measurement to 0.1mm, Near and far pupil distance, Glasses-free measurement for accuracy, Large, readable text, Dark mode support

**Features:** iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Accurate measurements for some users
- 💡 Pure IPD measurement
- 👍 Works quickly
- 👍 Remarkable use of iPhone tech

**What reviewers complain about**

- 🐛 Inaccurate measurements reported
- 🐛 Compatibility issues with iPads
- 🐛 Does not work on older iPhones
- 🐛 Inability to read results without glasses
- 🐛 App crashes or fails to recognize eyes

**Reported bugs**

- Inaccurate IPD readings (up to 10% off)
- Does not work on iPad
- Incompatible with devices without true depth camera
- Cannot read results with glasses off
- App fails to recognize eyes

**Requested features**

- Allow measurement of near PD
- Improve compatibility information on App Store
- Fix compatibility for iPads and older iPhones
- Allow reading results with glasses on


### Pupil Detection

[App page](https://appshunter.io/ios/app/pupil-detection/id6739671823)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interpupillary Distance Meter free?

Interpupillary Distance Meter costs $0.99, with no in-app purchases.

### Is Pupil Detection free?

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

### Do Interpupillary Distance Meter or Pupil Detection have ads?

Pupil Detection shows ads; Interpupillary Distance Meter does not.

### Which is updated more often, Interpupillary Distance Meter or Pupil Detection?

Interpupillary Distance Meter ships an update every 43 months, and Pupil Detection every 2 weeks. Most recently, Interpupillary Distance Meter was updated on November 3, 2026 and Pupil Detection on October 9, 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.*