Looks like your theme built it.
A size chart that looks like a bolted-on widget gets ignored. Charts render as a native app block, inherit your typography and colors, and fall back to a one-line snippet on older themes.
Theme compatibility
App blockAny Online Store 2.0 theme works through the app block. Vintage themes use a one-line snippet, and headless storefronts use the API.
Whatever your storefront is built on
Online Store 2.0 themes
Add the app block in the theme editor, drag it where you want it, done. No code, no duplicated theme, no developer.
Vintage themes
One line in your product template. We give you the snippet and the exact place it goes for your specific theme.
Headless and custom
REST and JavaScript APIs return chart data and recommendations for storefronts we can’t reach through Liquid.
What you get.
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Inherits your design tokens
Fonts, colors, border radius, and button styling come from the theme rather than from us. It should look like you built it.
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Works on any Online Store 2.0 theme
App blocks are a platform feature, not a per-theme integration, so compatibility does not depend on us having seen your theme before.
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No theme file edits on 2.0
Nothing to undo when you change themes. Uninstalling leaves your theme exactly as it was.
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Mobile layout, not a squeeze
Wide charts get a horizontal scroll with a pinned size column rather than shrinking to unreadable text.
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Under 20kb on the page
Loaded after your content, so it doesn’t compete with the product image for bandwidth.
Specifics
- OS 2.0 install
- App block
- Vintage install
- One-line snippet
- Headless
- REST + JS API
- OS 2.0 themes
- All, via app block
- Page weight
- Under 20kb
- Available on
- Every plan
Questions we get.
The app block usually still works because it uses standard theme sections. If your product template is unusual, send us access and we will place it for you. That is included, not a paid service.
The rest of it.
All features1-Click size charts
Select your products, choose AI generation or a preset, and the charts build in the background.
Read moreFit Notes
“Customers say this runs small. Consider sizing up.” Generated from your reviews, not written by you.
Read moreUnit toggle (in / cm)
Defaults by region, switches in one tap, and remembers the choice across your store.
Read moreIt’ll work on your theme.
Install free and check it in a preview theme first. If it doesn’t look right, we’ll place it for you.