4.9 · 5,000+ Shopify stores · Built for Shopify
One app, one install. AI turns any size-chart image into a beautiful size guide
and a fit quiz that gives every shopper one confident answer — in under 30 seconds.
The shopper’s view
This is what shoppers see: a clear chart and one confident recommendation.
See what store owners say about SmartSize
Charts every shopper can read. A quiz that tells them their size. One install, one settings hub.
Drop in a size-chart image, screenshot, or spreadsheet — AI reads it and builds the chart for you. No retyping, no spreadsheets.
Shoppers tap “Find my size”, answer a few questions, and get one confident answer — “Your size is S” — in under 30 seconds.
An image, a screenshot, or a spreadsheet — whatever you have.
It reads every row and column, builds the chart, and localizes it into your storefront languages.
No code, no theme edits. Shoppers see the size guide — and the “Find my size” button — on every product page.
Fewer returns. More confident checkouts. Real humans on support.
I love using this app! My customers love it. I've used a few different apps like this and this is the one I decided to stick with. The app developers are super lovely and helped me out when I needed help with a setting that I missed while setting up.
Smart Size Chart & Size Guide has been a real game changer for our business. The process to setup charts + guides was not only extremely easy but looked absolutely amazing.
It's made a huge difference for our customers by providing them with a clear and accurate size guide. This has helped reduce sizing mistakes and made our customers much happier overall.
The size charts are really easy to add to the store and they look super nice. I had an issue with the theme font option not showing for me, and Helen was amazing. I think this is one of the fastest and friendliest support experiences I've had.
Pre-made size charts for the platforms you already sell with
Printful
Printify
Gelato
Spocket
SheIn
Zendrop
DSEvery store has a size chart. SmartSize turns it into something better.
A size chart app adds a clear Size Chart button next to the size selector on your product pages, opening a mobile-friendly size guide in a popup. SmartSize goes further: it also includes an optional AI fit finder quiz that tells each shopper their exact size — so you're not just showing measurements, you're answering "what size should I buy?"
Yes. Sizing is the single biggest driver of apparel returns — roughly 38% of online returns are due to fit or size issues. Giving shoppers a clear size chart, unit conversion, and an AI size recommendation before they buy is one of the most direct ways to cut return rates and protect margin.
A size chart is a reference table the shopper reads themselves. An AI size recommender (or fit finder) asks a few quick questions, estimates the shopper's measurements, and returns one confident answer — "Your size is S" — in under 30 seconds. SmartSize includes beautiful size charts on every plan and adds the AI fit quiz on Pro plans.
Yes. SmartSize works with all modern Shopify 2.0 themes (Dawn, Sense, Refresh, Studio, Trade, and well-built custom themes) via theme app extensions — no code changes required. Setup takes a few minutes.
Yes. SmartSize has a free plan that includes size charts, so you can launch professional size guides at no cost and upgrade to the AI fit quiz and advanced features as your store grows.
Free plan available. Set up in minutes — and if you get stuck, a real human answers, in your language.
Install on Shopify