# Interpupillary Distance Meter vs Split Flap

The clearest difference is monetization model: Interpupillary Distance Meter at free against Split Flap's paid. Interpupillary Distance Meter also leads on update cadence (every 6 weeks vs every 17 months) and ratings volume (512 vs 6). On price, rating, ads and in-app purchases there is nothing between them.

Interpupillary Distance Meter costs $0.99 and Split Flap $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.6 for Interpupillary Distance Meter against 4.7 for Split Flap. That said, the two scores are not equally well evidenced: Interpupillary Distance Meter has 512 ratings behind it against 6, so its average is the more settled of the two.

Interpupillary Distance Meter ships an update every 6 weeks, Split Flap every 17 months. The most recent releases landed on October 15, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Interpupillary Distance Meter | Split Flap |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | [4.6 (512 ratings)](https://appshunter.io/ios/app/interpupillary-distance-meter/id1481753106/reviews) | **[4.7 (6 ratings)](https://appshunter.io/ios/app/split-flap/id1498259010/reviews)** |
| Number of ratings | **512** | 6 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 17 months |
| Monetization | **Free** | Paid |
| Size | 8 MB | 1 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Ubicolor Ltd](https://appshunter.io/developer/828691698) | [Zac Gorak](https://appshunter.io/developer/916419489) |

## 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

**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


### Split Flap

[App page](https://appshunter.io/ios/app/split-flap/id1498259010)

This utility app displays the time with an elegant split-flap design. It offers customizable themes, supports various time formats, and includes optional sound and seconds display.

**Highlights:** Split-flap time display, Customizable themes, 24-hour and 12-hour formats, Optional seconds display, Sound options, Open source

**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 Split Flap free?

Split Flap costs $0.99, with no in-app purchases.

### Which has better reviews, Interpupillary Distance Meter or Split Flap?

Split Flap is rated higher. Interpupillary Distance Meter averages 4.6 out of 5 from 512 ratings, while Split Flap averages 4.7 from 6 ratings.

### Do Interpupillary Distance Meter or Split Flap have ads?

Neither Interpupillary Distance Meter nor Split Flap shows ads.

### Which is updated more often, Interpupillary Distance Meter or Split Flap?

Interpupillary Distance Meter ships an update every 6 weeks, and Split Flap every 17 months. Most recently, Interpupillary Distance Meter was updated on October 15, 2026 and Split Flap on October 1, 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.*