Comparison

PD+ vs Opthy

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PD+

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
Read full description

PUPILLARY DISTANCE PD+ instantly measures pupillary distance (PD) by capturing & processing a single, hi-res facial photo. Measurement accuracy is guaranteed to be the highest achievable by the capability of your device's camera system. Far and near PD's -- binocular & monocular -- are always available at no cost. FITTING HEIGHT PD+ instantly measures Fitting Heights for the frames you currently have on. Accurate fitting height and PD measurements are needed to ensure that lenses being made for your frames are properly centered on your eyes to achieve optimal viewing clarity. In addition, Fitting Heights are used to position segments for fitting multifocal lenses. Please note: Fitting Height is currently only supported on devices equipped with the TrueDepth or LIDAR camera systems (e.g., iPhone X and later non-SE models). CALCULATORS - Rx Transposition - Vertex Adjustment - Crossed Cylinders (over-refraction) - Keratometry Conversion - Visual Acuity Scale - Estimated visual acuity - Minimum Blank Size (MBS) - Simple Magnifier and Spectacle Magnifications

About

Opthy

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
Read full description

Pupillary Distance: The key to your perfect glasses. Discover Opthy, powered by global eyewear expert EssilorLuxottica. Get your Pupillary Distance just right with Opthy, the solution backed by EssilorLuxottica’s eyewear experts. Swiftly measure your Pupillary Distance (PD) with a few clicks, so you can find a comfortable and personalized fit for your perfect glasses. Moreover, experience the cutting-edge capability of turning your iPhone into a 3D body scanner and measurement device for purchasing prescription Rx glasses online with Opthy. Key Features: • Advanced contactless tool for PD measurements: Opthy's cutting-edge technology specializes in swiftly capturing Pupillary Distance (PD) measurement, revolutionizing the conventional process. • Quick IPD measurements for far focal lengths: Opthy offers quick Interpupillary Distance (IPD) measurements for far vision, allowing you to find a comfortable viewing experience for distant distances. • Order online prescription glasses with confidence: Opthy empowers you to confidently order prescription glasses online, knowing that you obtained personalized measurements for achieving a comfortable fit. About Pupillary Distance: Pupillary Distance is the distance between the center of your pupils, measured in millimeters. An average PD measurement is about 63mm. This crucial metric is essential when buying glasses, as it indicates the specific lens area you look through, helping you to achieve optimal comfort and clarity in your visual experience. Swift and User-friendly: Opthy has streamlined the process for you. All you need is your iPhone; the Opthy app will walk you through the quick and seamless scan. Once done, you'll receive the all-important Pupillary Distance measurement. Suitable for Everyone: Whether you wear glasses or not, Opthy caters to all adult users. It provides personalized Pupillary Distance measurements for compatible prescriptions. Prescription Compatibility: Opthy is compatible with single-vision prescription lenses between -5D and +5D. Please note that it is unsuitable for higher-powered prescriptions, bifocals, progressives, or multifocals. Professional in-person PD measurements are recommended for achieving the best fit and visual experience for individuals requiring more complex prescriptions. Age Restriction: For user safety, Opthy is not intended for use by persons under the age of 18. EssilorLuxottica prioritizes the well-being of our users and adheres to age-appropriate guidelines. Experience Cutting-edge Technology: Opthy harnesses cutting-edge technology to enhance your eyewear selection process. Its innovative approach to measuring Pupillary Distance (PD) empowers you with your personal PD so you can make confident decisions when purchasing glasses or adjusting your virtual reality (VR) headset.

Screenshots

PD+4 screens
Opthy4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

PD+ ships an update every 2 months, Opthy monthly. Both last shipped on October 27, 2026.

Scorecard6 real differences · 4 level
PD+ versus Opthy: the parameters behind the verdict, then further details
ParameterPD+Opthy
PriceFreeFree
Rating4.7 (555 ratings) — better4.5 (3K ratings)
Positive reviews54.2% of reviews — better13.2% of reviews
Number of ratings5553K — better
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.614.0 — better
Further details — not scored
Size76 MB217 MB
Age rating4+12+
DeveloperZernike LLCLuxottica Group SPA

Customer experience

PD+

All ratings509 ratings
Positive92.5%
Neutral2.8%
Negative4.7%
Written reviews24 reviews
Positive54.2%
Neutral8.3%
Negative37.5%

Opthy

All ratings2,938 ratings
Positive85.9%
Neutral3.1%
Negative11.0%
Written reviews182 reviews
Positive13.2%
Neutral6.0%
Negative80.8%

User reviews

PD+

From 555 App Store ratings

What we love

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

Room to improve

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

Opthy

From 3K App Store ratings

What we love

  • 🚀 Quick and easy
  • 📐 Accurate measurements
  • 🤖 Clear instructions

Room to improve

  • 🤔 Inconsistent results
  • 🤯 Difficult to use
  • 🕰️ Time-consuming process
  • 🔍 Lighting issues
  • 🤖 Unreliable app

Bugs and requests

PD+

Reported bugs

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

Requested features

1 request
  • Can this app measure the PD for progressive lenses for right and left eyes?

Opthy

Reported bugs

3 issues
  • App crashes or freezes
  • Face not detected despite proper lighting
  • Incompatible with certain devices

Requested features

3 requests
  • Voice guidance for instructions
  • Progress indicator during measurement
  • Ability to save and view past measurements

In-app purchases

1 purchases

PD+

One-time1
  • Lifetime Subscription$7.99
None

Opthy

No in-app purchases

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 27, 2026.

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