FitChart — Size Chart & Guide for Shopify

Show shoppers the right size on every product page. Templates, unit conversion, and multi-tab charts that load without layout shift.

• Theme App Extension. No script injection, no iframe — your storefront stays fast and Built for Shopify-ready.
• Templates & multi-tab charts. Start from a tested layout, add per-category tabs, switch units inline.
• Assign per product or rule. Bind charts to products, vendors, or collections — survives theme changes.