The app doesn't show on my theme

In more than 99% of cases Cartsaver works without theme changes. When it doesn’t, the cause is usually another app modifying the same area, or a theme that hasn’t been migrated to Online Store 2.0.

1. Check that App Embeds is enabled

From Shopify admin: Online Store → Themes → Customize.
In the top dropdown, pick App embeds.
Find Cartsaver in the list and confirm the toggle is on (green).
Click Save.

2. Confirm your theme version

Cartsaver supports Online Store 2.0 themes only (Dawn, Refresh, Sense, and any theme released after 2021).
Legacy Vintage themes won’t show the blocks.

Fix: upgrade to an Online Store 2.0 theme. Shopify’s free Dawn theme is always available as a preview.

3. Look for conflicting apps

These app categories often modify the thank-you page and can clash with Cartsaver:

Post-purchase upsell apps.
Loyalty / rewards apps that show a badge on the thank-you page.
Review-collection apps that prompt on the thank-you page.

Fix: open each of those apps’ settings and look for a “Show on thank-you page” option. Re-order if needed so Cartsaver shows first.

4. Check Checkout Extensibility

Cartsaver uses Shopify’s Checkout UI Extensions (the modern standard).
Stores still on Legacy Checkout (pre-2024 and never updated) won’t see the block on the thank-you page.

Fix: enable Checkout Extensibility from your Shopify settings. Shopify auto-upgrades the checkout — no code changes needed.

5. Browser cache

After enabling the app, your browser may cache an older version of the theme.

Fix:

Close and reopen the browser.
Try in an Incognito / Private window.

6. Custom CSS hiding the block

In rare cases, custom CSS on the theme hides the block.

Fix: open Online Store → Themes → Customize → Theme settings → Custom CSS and look for any rules referencing .cartsaver, #cartsaver, or display: none applied to general elements.

7. SuperShop or custom themes

If you use a heavily customised theme, the block may need a non-standard placement. Cartsaver still uses standard Theme App Extensions — the theme developer can confirm compatibility.

8. Still not working?

Head to Contact support with:

Your theme name and version.
A list of other apps installed.
A screenshot of Customize → App embeds.