No ads · No subscription · On-device

Measure your PD
for glasses shopping.

Calibrate with any credit-card-sized card, place a marker on each pupil in a mirror or photo, and read your pupillary distance in millimeters — binocular and per eye.

Download on theApp StoreFree to download · $4.99 one-time unlock

Shopping aid only — not a medical device. PDExact does not diagnose conditions, replace an eye exam, or provide a prescription. For clinical PD or medical advice, see an eye care professional.

Card-calibrated Binocular + per-eye PD No ads, no subscription Pay once

Everything you need, nothing you don't

One job, done well — and done privately.

Card calibration

Any credit-card-sized card sets the scale.

Mono and binocular

Your binocular PD plus left and right values, in millimeters.

Result PDF

Save a PDF of your result to use when ordering glasses online.

How it works

No tutorial, no account, no setup.

Calibrate

Match the guide to a credit-card-sized card.

Place the markers

One on each pupil, in a mirror or photo.

Read your PD

Save the result as a PDF.

One-time purchase

$4.99 once

Free to download and try — then pay once for unlimited use. No ads, no subscription.

Unlimited use after unlock
Everything on-device & private
No ads and no subscription
Card-calibrated, mono and binocular

Download on theApp Store

Questions, answered

Is this a medical measurement?

No. PDExact is a shopping aid for ordering glasses online. It is not a medical device and does not provide a diagnosis, a prescription or a clinical PD measurement. For medical or prescription needs, see an eye care professional.

Is my photo uploaded?

No. Everything stays on your iPhone — no servers, no accounts.

Is it a subscription?

No. It's free to download; one payment unlocks unlimited measurements. No ads.

Your PD, ready for your order

A shopping aid for glasses — on-device, pay once.

Download on theApp Store