SizeCast
SizeCast
SizeCast adds a size calculator and a full size chart to your product pages. Shoppers enter their height and weight, get a confident recommendation tuned to their fit, and the matching variant is selected for them — one tap from popup to cart.
A recommendation engine, a size chart, and automatic variant selection, all rendered by your own theme.
Shoppers enter height and weight — plus optional chest, waist, and a snug/regular/oversized fit preference. A weighted engine matches them to your chart and handles the between-sizes case honestly.
When a shopper accepts the recommendation, SizeCast selects the matching variant on the product form and updates the URL — closing the loop to add-to-cart. No other size app does this.
The same popup carries a complete size chart with instant cm/in and kg/lb switching. The recommended row is highlighted, so measurements and the recommendation live side by side.
The storefront widget ships translated in eleven languages including Arabic with full right-to-left layout — free on every plan. Charts stored as native Shopify data translate with your store's own tools.
Your charts are stored in your store's own data and rendered by your theme in pure Liquid — no external scripts, no loading flicker, and the widget keeps working even if our servers are unreachable.
Shoppers' measurements are calculated entirely in their browser and never sent to, or stored on, any server. SizeCast keeps no customer personal data at all.
Start from an apparel preset and adjust the numbers to your garments, import a CSV, or build one by hand. Charts save into your store's own data.
Attach a chart to individual products or a whole collection, or set one store-wide default. Each product shows exactly one chart — no priority rules to manage.
One click drops the "Find my size" button onto your product template. It matches your theme's own button styling automatically, and only appears where a chart is assigned.
No per-order fees, no per-visitor fees, no per-recommendation fees — the charges that make other size apps unpredictable. Just one flat plan.
Add SizeCast to your store and give every shopper the confidence to buy the right size the first time.
Get SizeCast →