Questions & answers

A shopper enters their height and weight — and optionally chest, waist, and a fit preference. SizeCast scores each size in your chart against those measurements using a weighted range model, picks the best match, and honestly flags when someone falls between two sizes, nudging up or down based on their snug/regular/oversized choice. It's deterministic: the same inputs always give the same, explainable result.

No. Your charts are stored in your store's own data (Shopify metaobjects) and rendered by your theme in pure Liquid, with no external scripts loaded on your storefront. The widget's small script stays well under Shopify's app-block budget. There's no loading flicker, and because nothing depends on a round-trip to our server, the widget even keeps working if our server is briefly unreachable.

The Free plan covers up to 5 connected products with every widget feature included — the recommender, the size chart tab, all 11 languages, and variant auto-select. The Pro plan is a flat $4.99/month (14-day free trial) for unlimited products, whole-collection assignment, and a store-default chart. There are never per-order, per-visitor, or per-recommendation fees.

None. Shoppers' measurements are computed entirely in their browser and are never transmitted to us or stored on any server — only, optionally, in that shopper's own browser for their convenience on return visits. SizeCast holds no customer personal data. See the privacy policy for the full detail.

Yes — this is the part most size apps don't do. When a shopper taps "Use this size", SizeCast selects the matching variant on your product form and updates the page, so they're one tap from adding the right size to cart.

The storefront widget ships in English, Arabic, French, German, Spanish, Italian, Dutch, Portuguese (Brazil), Swedish, Danish, and Polish — free on every plan. Arabic renders with full right-to-left layout. Because charts are stored as native Shopify data, their content can also be translated with your store's own translation tools.

You add it to your product template from the theme editor in one click. By default it copies your theme's own button styling automatically so it matches Add-to-cart, but you can switch to solid, outline, or text-link styles and control the color, alignment, width, padding, or add custom CSS. It only shows on products that have a size chart assigned.

Your charts live in your own store's data, so they're yours. You can export them to CSV before uninstalling. When you remove the app, our server deletes its session record for your store; your store data is cleaned up by Shopify. Nothing about SizeCast locks your data in.

SizeCast is a theme app extension and works with all Online Store 2.0 themes — the current generation of Shopify themes. It installs and uninstalls cleanly, adds no leftover code, and inherits your theme's typography and colors automatically.