Comparison
Looplift vs. Shoplift
Shoplift is the app most Shopify merchants find first: 4.9★ across 117 reviews on the Shopify App Store and live since September 2022. It is a mature theme and template testing tool, and it describes itself as the first testing app to be Shopify Plus Certified.
Its own site puts the scope plainly: with theme tests and template tests, no part of your store is off limits. It tests blocks, sections, templates and app blocks, it can inject Liquid or JavaScript, and you build the test inside Shopify’s own theme customizer with a one-click apply-winner step at the end. That is a real capability and Looplift does not have it.
So this page is not an argument that Shoplift is bad. It is an argument about one design decision that runs in opposite directions, and about which side of it you want to be on. Every fact about Shoplift below is from Shoplift’s own site or its App Store listing, read on 2 August 2026, with the source noted in the page source. Check the current listing before you decide — vendors move.
| Shoplift | Looplift | |
|---|---|---|
| What it can test | Whole themes, templates, blocks, sections and app blocks. Product pages, collections, homepage, search. Prices and subscriptions on the Advanced plan. | Elements inside the page you already have: copy, CTAs, badges, social proof, ordering and layout within a page. No whole-theme swap. No price, shipping or checkout testing. |
| How it reaches your store | Integrates with your theme and builds tests in Shopify’s theme customizer — which is exactly what makes theme-level testing possible. | A first-party snippet you paste once. There is no code path in Looplift that writes to a Shopify theme, and the write_themes permission is never requested. Removing the snippet removes everything. |
| Where the test idea comes from | You, mostly. Lift Assist™ auto-creates branded split tests and recommends conversion features such as countdown timers, sticky carts and inventory indicators; it is on the Advanced plan. | An audit of your storefront produces three specific proposals — hypothesis, expected impact, and a variant already built against your page — before you have decided anything. |
| Calling results | Bayesian predictive analysis, listed on the Core plan, with device segmentation. Audience and country segmentation on Advanced. | Frequentist: Wilson confidence intervals and a two-proportion z-test, with the verdict withheld until a pre-committed sample target and a full seven-day cycle are both met. |
| Price | $99 / $399 / $999 per month, or $74 / $299 / $699 billed annually — their pricing page and the App Store listing agree once you compare the same billing mode. Every tier is banded by monthly store visitors and these are the lowest-band figures, so the number grows with your traffic. 14-day free trial. | $99 / $299 / $999 per month, by number of sites rather than by your traffic — a busy month does not reprice you, and adding a teammate does not either. The audit is free. |
| Track record | 4.9★ over 117 reviews and nearly four years live — the strongest reputation in the category, and Shopify Plus Certified. | New, in private beta, and not yet listed on the Shopify App Store. You would be an early customer, with everything that implies. |
The one decision this whole comparison turns on
Shoplift integrates with your theme. That is the source of its strength and it is not a euphemism: because it works inside the theme, it can swap a whole theme, test a template against another template, and apply a winner in one click. If what you want to test is a redesign, there is no way to do that from outside the theme, and Looplift will not be able to help you.
Looplift made the opposite choice, and it costs us that entire capability. There is no theme write path in the product. We do not ask Shopify for the write_themes permission, so the answer to “what happens to my theme if this goes wrong” is structural rather than procedural: nothing, because nothing there can be reached.
Which of those you prefer is not a question about features. It is a question about what you are afraid of. Merchants who have been burned by an app leaving code behind, or by a theme that broke during a test, tend to want the structural answer. Merchants with a redesign to validate need the capability, and should take it.
Where the variant is applied — and the honest cost of our answer
Because Shoplift works through the theme, the variant is part of what the theme renders. Its site states that there is no page flicker or page speed issue.
Looplift applies the change in the visitor’s browser, from an allow-listed set of declarative operations — not arbitrary generated JavaScript. That has a cost, and this is the place to say it rather than bury it: between the original page painting and the variant being applied there is a seam. The snippet hides the affected document while it resolves and reveals it when ready, with a hard 1.5-second ceiling so that a failure reveals the original page rather than leaving a blank one.
We do not make a comparable no-flicker claim, and we are not going to. The delivery mechanism that would let us make one honestly is designed but not shipped, and the part it depends on has not been proven on a real store. Until it is, the claim would be marketing rather than fact. If that seam is disqualifying for you, that is a legitimate reason to choose Shoplift, and we would rather you learn it here than after installing.
What “AI” means in each product
Both products use the word. They mean different things by it, and the difference is worth understanding because it determines what you still have to do yourself.
Shoplift’s Lift Assist™ generates the test: it analyses shopper sessions and auto-creates branded split tests, including conversion features like countdown timers, sticky carts and inventory indicators. The strategy question — which page, which problem, which hypothesis — largely remains with you or your agency.
Looplift starts one step earlier. It audits the storefront, ranks what is worth testing, states a hypothesis with the evidence behind it, and then builds the variant. The output is a queue of proposals ordered by expected impact, not a blank editor. If your bottleneck is “we have a testing tool and nobody knows what to test first”, that is the specific problem this addresses — and no amount of testing infrastructure solves it, because infrastructure is not the thing that is missing.
One thing does not vary: nothing launches on its own. A person approves every experiment, and the approval is pinned to the exact version of the variant it approved — editing the variant invalidates it and it must be approved again.
How each one decides a test is over
Shoplift lists Bayesian predictive analysis on its Core plan. Looplift is frequentist: Wilson score confidence intervals for each arm, a Wilson interval on the uplift, and a two-proportion z-test. Neither school is better in the abstract, and anyone who tells you otherwise is selling something.
What matters far more in practice is what the tool does while you are watching a test run. Looplift withholds a verdict until two gates are both satisfied: both arms have reached a sample target committed to before launch, and the experiment has been live for 168 hours — one full weekly cycle, so that every day of the week contributes and a Tuesday-only result cannot masquerade as a finding.
The verdict is then taken once, at that moment, and frozen. That last part sounds pedantic and is not. We measured what happens without it: recomputing the verdict on every page load gave a 15.9% false-positive rate in a simulated null world, against the 5% the test is designed for. Someone who leaves a finished test open and keeps refreshing was getting a fresh roll of the dice each time. Later reads still update the intervals, because an interval is information; the decision is not re-taken.
When shoplift is the better choice
- You want to test a whole theme or template against another — a redesign, a seasonal theme, a page builder’s alternate layout. Looplift cannot do this, and it is Shoplift’s core strength.
- You need price, shipping or subscription testing from the same tool. Those are server-side concerns and out of scope for us, permanently, not just for now.
- You want the safest vendor choice available today. Four years of reviews, 117 of them, and Shopify Plus Certification are evidence we do not have yet and cannot manufacture.
- The seam between first paint and the variant being applied is unacceptable for your storefront. That is a real trade-off of our approach, not a bug we are about to fix.
When Looplift is the better choice
- The reason you have not been testing is that nobody on the team knows what to test first. That is the part Looplift automates, and it is not what testing infrastructure is for.
- You have read the reviews about A/B apps leaving code behind or breaking a theme, and you want a tool that cannot do either — because it never writes there, rather than because it promises not to.
- You want the statistical call to be conservative by default rather than something you have to configure correctly.
- You would rather pay by how many sites you run than by how much traffic they get, so that a good month does not raise your bill.
Shoplift is the better tool for testing themes and templates, it has the track record, and for a redesign it is the right answer. Looplift is the better fit if your bottleneck is deciding what to test, and if “it can never touch my theme” is worth more to you than “it can test my whole theme”. If you are not sure which describes you, the free audit costs nothing and answers it: if the three proposals are things you had already thought of, your bottleneck is execution and you should buy Shoplift.
FAQ
Shoplift vs Looplift — common questions
Including the answers that are limits rather than features.
The cheapest way to decide
Run the free audit. In minutes you get three specific, evidence-backed experiment proposals for your own site — then judge the quality of the thinking for yourself. No card required, and nothing launches without your approval.