SmartSize gives you three building blocks. Once you see how they fit together, the rest of the app falls into place: a fit quiz tells a shopper what size to buy, a size chart shows them the table, and product display rules decide which products — and now which markets — each one appears on.
The three building blocks
The fit quiz — a few quick questions about height, fit, or preferences. SmartSize uses the answers to recommend the right size.
The size chart — the table shoppers see when they tap Size guide on a product page: measurements, fit notes, and images that help them choose with confidence.
Product display rules — the settings that answer one question: "Where should this quiz or chart appear?" You define them once per quiz or chart, and SmartSize shows it everywhere those rules match.
Product display rules: which products
You choose the products a quiz or chart appears on using any combination of five filters:
Filter | Shows on… |
Products | Specific products you pick. |
Collections | Every product in the chosen collections. |
Types | Products of a given product type. |
Vendors | Products from a given vendor. |
Tags | Products carrying a given tag. |
When you use more than one filter, a match condition decides how they combine. It lives behind the Customize link under Advanced rules:
Any (the default) — a product matches if it satisfies at least one filter. This is a union: tag "summer" or vendor "Acme" covers all summer products plus everything from Acme.
All — a product must match every filter. Tag "summer" and vendor "Acme" covers only Acme's summer products.
If you use only one filter type, the match condition makes no difference.
Markets: which Shopify markets
If you use Shopify Markets to sell into different regions, you can now limit a quiz or size chart to specific markets — so shoppers in each region see the chart built for them. This is set in the Markets (optional) block inside the product display rules, using the Add a market dropdown.
Two things to know:
Leave it empty and it shows in every market. That's the default — most stores never need to touch this.
Add one or more markets and the quiz or chart shows only in those markets.
Markets work as an extra layer on top of your product filters, not a replacement. A shopper sees your quiz or chart only when both are true: the product matches your display rules, and the shopper is browsing in one of the selected markets. So a chart set to Collection "Dresses" and Market "United States" appears on your dresses — but only for shoppers in the US market.
Connecting a quiz and a size chart
Each quiz and each chart can stand on its own. But most of the time you'll want to connect a quiz to the chart that covers the same products — for example, a "Women's dresses" quiz paired with the "Women's dresses" chart.
When a quiz and a chart are connected:
They share one set of product display rules — the same product filters, match condition, and markets.
Editing the rules on either side updates both, automatically, when you save. That's what the banner "Changes to product display rules will sync to the connected quiz/size chart on save" means.
They stay independent in every other way — different content, statuses, and translations.
A few rules to remember:
A quiz can be connected to one chart at most, and a chart to one quiz at most.
Disconnecting never deletes anything. Both keep their rules and keep working on their own.
A quiz or chart can't go Active without at least one product display rule — without one, it has nowhere to appear.
When several match the same product: priority
Two active quizzes can legitimately match the same product — say a general "Women's tops" quiz and a more specific "Linen shirts" quiz. Only one can show on the page, and priority is the tiebreaker.
Priority is a number on each quiz — the lower the number, the higher it ranks. A quiz at priority 1 beats one at priority 5.
If two matching quizzes have the same priority, the most recently updated one wins.
Give your specialised quizzes lower numbers so they beat your general-purpose ones.
The matching-products preview table shows an Existing quiz column so you can spot overlaps before you save and adjust priorities to get the result you want.
💡 Tip: Start simple — one quiz, one chart, connected, targeting a collection. Reach for match conditions, priority, and markets only when you actually have an overlap or a region to handle.