01step.01
Measure
Hold any card-sized object (library card, loyalty card, business card) up to your face. Our AI uses the card as a reference to calculate your exact frame width in millimeters.
↳ Powered by Google MediaPipe. ±1mm accuracy.
Waitlist open · Q1 2026
Measure once.
Fit everywhere.
The browser extension that remembers your exact face width and shows you every pair of glasses that fits - across Woolet, Warby Parker, Ray-Ban, Mister Spex, and 40+ eyewear stores.
Built by the team behind Woolet - eyewear engineered for wide faces.
Aviator 142fits
Round 138fits
Wayfarer 150too wide
[ The problem ]
73% of online eyewear returns come down to one thing.
Frame width.
14pairs
Average frames someone tries before finding the right fit
$47
Average cost of an online eyewear return
3.2years
How long most people keep glasses that don't actually fit
Data from industry reports. Your face deserves better math.
[ How it works ]
Three steps. Eight seconds. Forever.
02step.02
Save
Your measurement lives in your browser. Nothing uploads to our servers. Nothing syncs to our database. Nothing gets shared with anyone, ever.
↳ 100% on-device processing. Zero cloud.
03step.03
Shop anywhere
Open any eyewear site. Fitlens highlights frames that fit your face and filters out the ones that don't. Works across dozens of stores automatically.
↳ Chrome, Edge, Firefox, Safari.
[ Coverage ]
One measurement. Every store.
The extension works on every major eyewear retailer. Measure your width once and shop anywhere.
40+ stores at launch. Adding new retailers weekly.
Woolet
Warby Parker
Ray-Ban
Mister Spex
Lenskart
GlassesUSA
Eyebuydirect
Oakley
Persol
Kodano
Vision Express
Eyerim
Andy Wolf
Lindberg
Muscat
[ Privacy ]
Your face never leaves your device.
We built Fitlens so we can't see your data even if we wanted to.
"No photos uploaded.
No face data stored on our servers.
No biometric tracking.
Ever."
- Processing happens locally in your browser
- Only millimeter values are saved, never your image
- MediaPipe runs on-device - zero cloud inference
- GDPR compliant by design, not by policy
founder.marek
[ Origin ]
Why I built this.
"I founded Woolet because I have a wide face and standard frames never fit. After four years selling glasses online, I realized this isn't a niche problem - 40% of shoppers return their first online eyewear order because of sizing. The industry knows this. No one solves it. Fitlens is the fix."
- Marek, Founder
[ FAQ ]
Questions before you sign up.
Early 2026. Waitlist gets access two weeks before public release.
Chrome, Edge, and Firefox at launch. Safari within 90 days. No mobile app needed - the browser extension does everything.
Within ±1mm when you follow the card calibration. That's more precise than the rounding most retailers use for their size categories.
Yes. Free for users. We earn commission from retailers when you buy frames we recommended. You pay nothing, ever.
The 15 largest online eyewear retailers in the US and EU. Full list posted to the waitlist before launch.
No. All measurements happen locally in your browser. We receive only anonymous usage stats - never your photo, never your face geometry.
[ Join the waitlist ]
Stop guessing your frame size.
Join 2,000+ people on the waitlist.