Turn your top opportunity into a live experiment
Your audit ranks each opportunity by what it's costing you. Test takes the one at the top, writes the variation code to fix it, runs it as a live A/B test, and measures the result until you know whether the change actually worked.
Surface reviews next to the buy button
Show shipping cost on the product page
Add a guest checkout path
Move express pay above the fold
Reorder path for returning buyers
Spar writes the change, you approve it before it ships
For the opportunity at the top of your list, Spar writes the variation as a self-contained snippet that changes the live page, with every headline, color, and label left editable. Nothing goes live until you approve it, so you always control what shoppers see.
.checkout__gate {require-account: true;cta-label: "Create account to pay";}
.checkout__gate {guest-checkout: enabled;cta-label: "Continue to payment";express-pay: "above-fold";}
Approval gate before launch
Edit the copy, swap an image, or send it back. The test sits in Draft until you move it to Running.
Yes, we know guest-checkout: enabled isn't real CSS. We weren't sure if you knew, so: it's for illustration. The variations Spar actually ships are real code.
Watch the evidence add up, stop when it crosses your threshold
Spar measures the test itself rather than handing the numbers to GA4 or Clarity. It tracks each variation's chance to win as sessions accumulate, using sequential statistics so you can check progress whenever you want without the repeated peeking that normally inflates false positives. When the leader crosses your confidence threshold, Spar declares the winner.
Chance to win
Express pay above the fold
The threshold is yours to set
Pick how confident a variation has to be before Spar declares it the winner. The dashed line is that bar.
No fixed end date required
Sequential statistics stay valid no matter when you stop, so a clear result can end the test early instead of burning two more weeks of traffic.
Inconclusive is a valid outcome
If the curve never crosses, Spar says so rather than forcing a winner out of noise.
Ship it through Spar, or the platform you already run
The same approved variation goes live either way: Spar serves it directly, or pushes it into the experimentation platform your team already uses.
Spar ships it
Theme extension or embed script
On Shopify, the variation runs through Spar's theme app extension, with no theme edits and no code to paste. On any other stack, paste one Spar script into the page head. Either way, Spar serves the variation and runs the test for you.
<script src="serve.spar.../e.js" async>
Your platform ships it
Push to the tool you already run
Already running an experimentation platform? Spar pushes the approved variation into it and keeps the two in sync, so the test runs in the tool your team already uses.
See whether your ideas actually convert
Test takes your top opportunity live, measures it with sequential statistics, and makes sense of the results, so you ship the change knowing it works.
The storefront diagnosis every other feature is built from.
Findings mapped into scored funnel stages.
The evidence behind every finding, from analytics to reviews.
Search how top stores in your space solve the same problem.
Page-level fixes behind each stage.
Write up findings and share the plan.
Ask the funnel questions in plain language.
Put your biggest opportunity to the test
Connect your store and Spar audits it, drafts a variation for your highest-impact opportunity, and runs the test for you. You approve what ships and read the result.