Yes — three things, and they're the reason this doesn't feel like other A/B testing apps.
It tests your real theme templates.
Most A/B testing apps work by letting the original page load, then rewriting it in the browser. That's why you sometimes see a page flash and change on sites running tests — it's called flicker, and it's both ugly and bad for results, because some visitors see the old version for a moment and some never see the new one at all.
Mouse Whisperer duplicates your actual theme template into a real variant. Each visitor is assigned a variant on the server before the page renders, and then just gets that page. Nothing rewrites, nothing flashes. Both versions are real pages in your real theme.
Only real humans are counted.
The same filtering that runs everywhere else runs here. Bots and zombie sessions never enter the test results — which means your sample is smaller but honest, and you're not declaring winners based on scraper traffic.
It won't let you call a winner too early.
This is the most common way A/B tests go wrong. You're three days in, variant B is up 15%, you call it, you ship it, and it does nothing — because 15% on 60 visitors is noise.
The app holds back. Until there are enough real visitors in the test overall and enough in each individual variant, it will tell you "too early" instead of showing you a winner. Once there's enough data, it tells you which is leading and by how much — or tells you honestly that there's no clear difference, which is a real and useful result.
Test setup, briefly: pick a page type (product, collection, homepage, blog, page, or cart), pick what you're optimizing for (add to cart, conversion, revenue, click-through, or engagement), and launch. Visitors stay on the same variant for their whole session, so nobody sees the page change mid-visit.