Plain rules for a free product.

Fitlens is a browser extension and companion web app that measures your face width and highlights eyewear that matches it across participating online stores.

Fitlens is free for users. We may earn a commission from retailers when you buy frames we recommended. This never changes the price you pay or the order of the fit results.

Measurements are accurate to within about ±1mm when calibration instructions are followed. Retailer size data can be incomplete or inaccurate, so a recommendation is guidance, not a guarantee of comfort.

Always check the return policy of the store you buy from. Fitlens is not a party to your purchase.

Do not scrape, resell, or reverse engineer the service, and do not use it to measure another person without their consent.

We may suspend access where use is abusive, unlawful, or degrades the service for others.

Fitlens is provided as is, without warranty. To the extent permitted by law, we are not liable for purchases made based on fit recommendations.

We may update these terms as the product develops. Material changes will be announced by email to waitlist members before they take effect.