For Shopify stores

Shopify A/B testing that never touches your theme

Looplift is an AI A/B testing and CRO tool for Shopify stores. It audits your storefront, decides what is worth testing, builds the variant, and runs it through a native app embed — the same mechanism the platform gives every app, activated with a switch in your theme editor. Your theme files are byte-identical before and after, and no experiment goes live until you approve it.

We read 385 reviews across the Shopify App Store’s CRO & A/B testing category on 31 July 2026. Of the 73 rated three stars or below, 7% describe code left behind after an uninstall and 5% describe an app breaking the store or the theme. That is the fear this product is built around — not page speed, which accounted for a single review out of the 73.

Compare the alternatives

What Looplift can and cannot test on a Shopify store

Stated here rather than discovered after you install. The left column is the whole product; the right column is not a roadmap.

How it works on a Shopify store

1. 1

   Connect your store and turn on the app embed

   Installing Looplift is a normal Shopify OAuth screen — you approve one permission, and the app installs. The only step after that is a switch in your theme editor, which Shopify leaves off by default for every app embed. Nothing is written into your theme files, then or ever — uninstalling removes the embed with the app.

2. 2

   Run the audit

   Looplift reads your live storefront — its pages, its performance data and, if you connect it, your GA4 — and produces three ranked proposals. Each one names a specific problem, the hypothesis behind it, and the change it wants to test.

3. 3

   Approve what you want to run

   The variant arrives already built against your real page content. You read it, edit it if you like, and approve it. Your approval is pinned to the exact version you read: edit it afterwards and it needs approving again.

4. 4

   Let the result be called honestly

   Looplift reports a confidence interval rather than a live scoreboard you can stop whenever it looks good, and its verdict accounts for the fact that you are watching. A test that has not earned a call is told so.

5. 5

   Keep the lesson

   A concluded experiment is interpreted and recorded: what moved, what did not, and what that suggests next. Those learnings rank the proposals in your next audit.

Where we are today: Looplift is a live, working Shopify app — not yet listed in the Shopify App Store’s own search results, since that submission is still pending a data-access review. Connecting a store above installs the real app today, the same way it works on every store already running it. We would rather you read that here than find it out during onboarding.

Why it cannot break your store

• No theme writes, by construction

  Looplift has no code that writes to a Shopify theme, and never asks for the permission that would allow it. This is why an uninstall cannot leave anything behind: there is nothing in your theme to leave.

• No AI-written JavaScript in your shoppers' browsers

  Every change is an allow-listed declarative operation — change this text, hide that element, insert this block — versioned, scoped and reviewable. A model proposes; it never gets to run code on your store.

• Everything fails open

  An operation whose target is not on the page is skipped rather than throwing. If our API is unreachable, the visitor gets your original store. The worst case is no experiment, never a broken page.

• Two kill switches and an automatic one

  You can stop every Looplift change on a site yourself, from your dashboard, without contacting us. We can stop the entire platform. And every running experiment is checked against its guardrail metrics every ten minutes and stopped automatically if it breaches them.

One honest cost, since the rest of this section is a list of guarantees: the app embed runs inline in your theme’s <head>, ahead of the page painting — measured on one real store at 265ms against a 336ms first paint, a real margin but not a promise that holds on every theme and connection.

And your storefront’s homepage is slower to update than the rest of your store: Shopify caches it separately, and a change we push there was still showing the previous version 37 minutes later in our own testing, with no sign of catching up. Product and collection pages update within seconds — that is where pause and the automatic guardrail stop are prompt — so a homepage experiment is the one place the kill switch above is not instant. We target experiments accordingly.

How Looplift compares to the apps you are probably also considering

Each of these pages says where the other app is the better buy, because most of the time one of them is. Facts are from the App Store listings as of 31 July 2026.

• Looplift vs. Shoplift

  The theme and template testing leader. Read this one if you want to test whole themes — we do not.

• Looplift vs. Intelligems

  The widest surface: prices, shipping, checkout, and a recommendation layer of its own.

• Looplift vs. Visually

  A no-code visual editor plus personalization, at a much lower entry price.

• Looplift vs. ABConvert

  Built around price, shipping and theme testing, metered by test orders.

Questions merchants ask first

Does Looplift edit my Shopify theme?

No. There is no code path in Looplift that writes to a Shopify theme, and we never request the permission that would let us. Variants are applied by a native app embed, and your theme files are byte-identical before and after.

Is Looplift on the Shopify App Store?

Not yet in the App Store's own search results — that submission is pending a data-access review. The app itself is live: install runs through the normal Shopify OAuth screen you approve, and the only setup step after that is turning on the app embed in your theme editor.

Can I A/B test prices with Looplift?

No, and we do not plan to. Prices, discount rules, shipping, stock and checkout are server-side commerce logic, and a testing tool that changes them can cost you real money when it gets something wrong. Looplift tests what your storefront says and shows: copy, calls to action, badges, social proof, layout and ordering. If price testing is what you need, apps like Intelligems and ABConvert are built for it.

Can I test a whole theme against another one?

No. Whole-theme and template testing needs an app that integrates with your theme, which is exactly what Looplift refuses to do. We test changes inside the pages your current theme already renders. Shoplift is the app to look at if theme-level testing is the requirement.

What stops a broken test from damaging my store?

Four things, all in code rather than in policy. Every change is an allow-listed declarative operation, never generated JavaScript. Any operation that does not match the page is skipped instead of throwing. If our API is unreachable the visitor gets your original page. And a running experiment is checked against its guardrail metrics every ten minutes and stopped automatically if it breaches them — plus you have a kill switch for the whole site.

Do I need a developer to run experiments?

For the storefront changes Looplift proposes, no — you connect the app once and approve variants from the dashboard. Some changes are genuinely developer work: anything touching server-side logic, pricing, stock or restricted checkout regions. Looplift labels those as needing a developer when it proposes them, rather than after you have approved one.

What it costs

Plans are priced by sites, active experiments and audits per day — not by your traffic and not by seats. Every plan starts with a free audit: three specific experiment proposals for your own store, no card required.