Fitly: Size Chart & Size Guide

Fitly helps you create professional size charts and size guides for your Shopify store without touching any theme code. Build custom size charts using 15+ ready-made templates — choose between table or image-based formats to launch in minutes. Display charts as a floating button or inline block that matches your store's design perfectly. Use smart assignment rules to apply size guides by product, collection, vendor, or tag with flexible inheritance. Set it up once and charts appear everywhere they should automatically. Customize every detail including icons, colors, padding, radius, and position to fit your brand. Track performance with built-in Analytics that show chart views, shopper engagement, and return-rate trends. See exactly how your size charts help customers pick the perfect fit and impact your bottom line. Theme-native placement via Theme App Extension ensures seamless integration with your storefront.