Know what size to buy. Without measuring yourself.

SizeSync recommends your size on ASOS, H&M, Zara, and Uniqlo by comparing the dimensions of items you already own. No height, no weight, no inseam. Just clothes that fit.

Chrome extension coming soon

How it works

Save what fits

On a product page, one click adds an item to your wardrobe with the dimensions already on the page. No measuring tape.

Shop anywhere supported

Visit any ASOS, H&M, Zara, or Uniqlo product page. SizeSync compares the page's size chart against your wardrobe.

Get a size, not a guess

See the recommended size with an explanation: chest matches your H&M slim L exactly, length 2cm shorter.

What we don't do

We never ask for your body measurements. We never sell your data. We never run ads in the sidebar. The extension only activates on the four supported retailer sites and nowhere else.

Full detail in the Privacy Policy and Terms of Service.