My Experience with Pupil Distance PD Meter Pro
My old glasses app got weirdly bloated with permissions, so I went hunting for a replacement. I found Pupil Distance PD Meter Pro. The promise was simple: use my Galaxy S23’s camera to get my PD without handing my face data to some server. I downloaded it on a Tuesday evening, ready to order new frames. Right away, I checked the privacy details—it claimed everything stayed on the phone, which was a huge relief. The first few tries were a mess. I was sitting at my kitchen table under the overhead light, and the app just couldn’t lock on. It kept telling me to hold still, but the target circles jittered all over the place. I must have looked ridiculous holding my phone at arm’s length, squinting at the screen. When it finally gave me a number, it was 64mm. Then I tried again two minutes later and got 66.5mm. That’s a big difference for something that needs to be precise. I spent the better part of an hour trying to get a consistent reading, and it left me more unsure than when I started.
Features Worth Noting
The app does have a few things going for it. I liked that I could measure each eye separately. My right eye always seems a bit off, so getting individual numbers felt more thorough. The history log is smart. It saved every attempt, so I could see all my wild results lined up, from 63mm to 67mm. Seeing the spread actually convinced me to just average them out myself. The interface is clean and there are no ads, which is what you’d expect for a paid app. The guided mode with the face outline is helpful in theory. It shows you where to position your face in the frame, which stops you from holding the phone at a totally wrong angle. When everything aligns—perfect, bright, diffused light from my living room window on a sunny morning—the process feels smooth and almost professional. For a brief moment, you think it’s going to work perfectly.
What Needs Work
The accuracy is just not reliable enough for me to fully trust it. A 2-3mm swing might not sound like much, but for glasses lenses, it can cause headaches—literally. The app is way too sensitive to lighting conditions. The tutorial mentions good light, but it doesn’t stress that mediocre light makes it practically useless. My biggest issue was with support. After my inconsistent results, I used the contact form in the app asking if there was a calibration trick or if my phone model had known issues. I got a reply two days later that basically just copied the app’s FAQ: “Ensure good lighting and hold the phone steady.” It felt like a bot response. I wrote back clarifying my question and never heard another word. For a paid tool, that level of support is pretty disappointing. It makes the whole experience feel abandoned.
Pricing
It costs $3.99. There’s no free version to test, which is a risk. I paid because my last app went free-to-premium and started asking for location data, so I was willing to spend a few bucks for something cleaner. Is it worth four dollars? If you get a lucky, consistent measurement on your first try, maybe. But if you’re like me and have to fight with it, it starts to feel like money wasted. You’re basically gambling $4 that your phone’s camera and your home lighting will play nice with this specific app. There are no subscriptions, which I absolutely appreciate, but the one-time fee doesn’t guarantee a one-time success.
Developer Notes
The developer is vistech.projects. Looking at the update history on the Play Store tells a story. The last update was over eight months ago. When you’re dealing with an app that relies heavily on camera and face detection, not getting regular updates is a red flag. Phone cameras and operating systems change. An app that isn’t maintained might slowly become less compatible or accurate. The slow, copy-paste support response I got fits this pattern. It feels like a project that was launched and then mostly left alone. That doesn’t inspire confidence for future fixes or improvements.
Security & Privacy
This was the main reason I chose it, and here it mostly delivers. The privacy policy clearly states that all the image processing happens locally on your device. No face data is sent to their servers. I monitored my phone’s network activity while using it, and there wasn’t any suspicious data transmission. It’s a standalone tool. There’s no account to create, no social login, and no trackers that I could detect. This is exactly what I wanted—a functional tool that respects the fact that my face is my own business. It’s a shame the core functionality isn’t more dependable, because the privacy approach is spot-on.
Does Pupil Distance PD Meter Pro measure each eye separately?
Yes, the app allows you to measure each eye individually, which is helpful if one eye's PD is slightly different from the other. This gives you more detailed results than a single combined measurement.
Does the app have a history log to track past measurements?
Yes, it automatically saves every measurement attempt in a history log, so you can see all your results side by side. This makes it easy to spot inconsistencies and even average them yourself for a more reliable number.
Why are my PD measurements inconsistent, and how can I fix it?
Inconsistent readings often come from poor lighting or slight head movement. For best results, use the app in bright, diffused natural light, like near a window on a sunny morning, and hold your phone steady in the guided face outline.
The app keeps telling me to hold still, but the circles jitter. What should I do?
This usually happens in low or harsh lighting, like under a direct overhead light. Try moving to a well-lit area with soft, even lighting, and make sure your face is fully inside the on-screen outline before tapping the measure button.
How does Pupil Distance PD Meter Pro compare to other PD measurement apps like GlassesOn?
Unlike some apps that send your facial data to external servers, PD Meter Pro processes everything on your device, which is better for privacy. However, its accuracy can be inconsistent in poor lighting, whereas some competitors may handle low-light conditions more reliably.
