Interpupillary Distance Meter vs Penlight.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interpupillary Distance Meter
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.
- Accurate IPD measurement to 0.1mm
- Near and far pupil distance
- Glasses-free measurement for accuracy
- Large, readable text
- Dark mode support
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Measure your inter pupillary distance with your iPhone or iPad in 1 second. • Most accurate measure to 0,1mm • Near and Far pupil distance measurements • Take your glasses off for better accuracy • Large text so you can still read your measurement • Dark mode supported ;)
Penlight.
This app provides a digital penlight with adjustable brightness and a built-in ruler for quick measurements. It also features color inversion for different examination needs and easy calibration using a credit card.
- Adjustable digital penlight brightness
- Credit card calibration for accuracy
- Color inversion for light/dark modes
- Metric and imperial ruler
- Educational examination tool
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Key Features: - Digital Penlight: Adjustable brightness slider for precise illumination - Easy Calibration: Quickly calibrate with a credit card to for accurate measurements - Color Inversion: Easily switch between light and dark modes for different examination needs - Ruler: Metric and imperial ruler for quick measurements Disclaimer: This app is intended for educational purposes only. It is not to be used for the diagnosis or treatment of any medical condition.
Screenshots
Verdict
The clearest difference is update cadence: Penlight. at daily against Interpupillary Distance Meter's every 43 months. Penlight. also leads on rating (5.0 vs 4.6). Interpupillary Distance Meter's advantage is ratings volume (515 vs 1) and price ($0.99 vs $1.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Interpupillary Distance Meter costs $0.99 and Penlight. $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Penlight. holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Interpupillary Distance Meter has 515 ratings behind it against 1, so its average is the more settled of the two.
Interpupillary Distance Meter ships an update every 43 months, Penlight. daily. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.
| Parameter | Interpupillary Distance Meter | Penlight. |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 4.6 (515 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 515 — better | 1 |
| Update frequency | Every 43 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 12+ | 4+ |
| Developer | Ubicolor Ltd | My Call Bag LLC |
Customer experience
Interpupillary Distance Meter
Penlight.
Bugs and requests
Interpupillary Distance Meter
Reported bugs
7 issues- 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
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- False compatibility information on App Store
- Cannot figure out how to measure near PD
Requested features
4 requests- Allow measurement of near PD
- Improve compatibility information on App Store
- Fix compatibility for iPads and older iPhones
- Allow reading results with glasses on
Penlight.
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Interpupillary Distance Meter
No in-app purchases
Penlight.
No in-app purchases
Questions
Is Interpupillary Distance Meter free?
Is Penlight. free?
Which has better reviews, Interpupillary Distance Meter or Penlight.?
Do Interpupillary Distance Meter or Penlight. have ads?
Which is updated more often, Interpupillary Distance Meter or Penlight.?
Other comparisons
