PD Meter vs Backfold Go

Ordering glasses online and need your PD? PD Meter helps you measure your pupillary distance (PD) in millimeters using a front-camera selfie and any standard-size card, like a credit card, for scale — no ruler, no second person, no trip to the optician. Your pupillary distance is the gap between the centers of your pupils. Online eyewear stores ask for it so your lenses are centered correctly in the frame. PD Meter gives you a quick, repeatable estimate from the comfort of your home. HOW IT WORKS • Hold a standard card (a credit card, ID or any ISO-size card) under your eyes — its known width gives the app a real-world scale. • Take a front-camera selfie, looking straight at the lens. • Mark the center of each pupil and the edges of the card. • PD Meter converts pixels to millimeters and shows your PD instantly. WHAT YOU GET • PD in millimeters, ready to enter at checkout. • Single (binocular) PD, the value most retailers request. • A clear, guided flow with on-screen tips for good lighting and head position. • Re-measure as many times as you like and average your results for confidence. WHO IT'S FOR Anyone buying prescription or blue-light glasses online, parents checking a child's fit, or anyone who simply wants their PD on hand without booking an appointment. A NOTE ON ACCURACY PD Meter provides an estimate based on your photo and the card scale. Results depend on lighting, camera angle and how precisely you place the markers. For high prescriptions or progressive lenses, confirm your PD with an optician. This app is not a medical device.

Your photos, safe on a drive you own. No cloud, no subscription. Connect an external drive, SSD, USB‑C stick or SD card to your iPhone or iPad, tap "Back up now" and Backfold Go copies your original photos and videos and your contacts. Everything goes into plain folders sorted by year and month that open on any computer. COPIES ONLY WHAT'S NEW Backfold Go remembers what's already on the drive, so after the first backup it copies only new photos and videos. You can rotate between several drives too. ORIGINALS, NOT REDUCED COPIES - Photos and videos at original quality (HEIC, JPEG, ProRAW, RAW, HEVC, ProRes) - Live Photos with their video - Optionally, edited versions next to the original - Contacts as vCard, ready to import again SIMPLE AND PRIVATE - No account, no servers: your data only goes to the drive you choose - Works with network drives and folders in the Files app too - Shows free space, what's left to copy and when you last backed up FREE TO START The free version copies up to 500 photos and videos, contacts always included. A single purchase (no subscription) unlocks unlimited photos and videos, for the whole family with Family Sharing. Want WhatsApp, Messages and a full iPhone backup too? Get Backfold for Mac and Windows: backfold.app