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Documentation Index

Fetch the complete documentation index at: https://arkticstudio.mintlify.app/llms.txt

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The app embed loads the Split Tester JavaScript on every storefront page. This script handles visitor identification, variant assignment, event tracking, and applying test changes (redirects, theme swaps, content injection). Without it, no experiments will run.

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Steps

  1. In your Shopify Admin, go to Online Store → Themes
  2. On your live theme, click Customize
  3. In the Theme Editor, click the App embeds icon in the left sidebar (puzzle piece)
  4. Find Split Tester and toggle it on
  5. Click Save
App embeds panel in Shopify Theme Editor

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Verify it’s working

After enabling, visit any page on your store. Then go to Get started in the Split Tester dashboard — Step 1 will show as complete once the first storefront event is received. You can also open your browser console and check for window.__SPT_VID__ — if it’s set, the embed is active.

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Performance

The embed script is served from Shopify’s CDN via the theme app extension. It:
  • Runs before page render to prevent content flash
  • Has a 2-second safety timer to always reveal the page even if something goes wrong
  • Uses navigator.sendBeacon for event tracking (non-blocking)
  • Reads experiment config from a metafield (zero API calls on the critical path)

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Multiple themes

The embed only needs to be enabled on your live theme. If you use a development theme for testing, you’ll need to enable it there separately. If you switch your live theme, re-enable the embed on the new theme.