One winning test usually pays for a year of Proba. Start free.
For sellers running their first test.
For sellers optimizing every listing.
For brands & agencies testing at scale.
Through Amazon's official Selling Partner API (SP-API). Proba runs experiments via Amazon's Manage Your Experiments — it only changes a listing as part of a test you launch, and reverts to the winner when you complete it.
Main image, title, price, bullet points, and A+ content. Pro and Scale unlock all element types and unlimited concurrent experiments.
Every test is scored with a two-proportion z-test that turns the conversion difference into a confidence level. We only call a winner at 95% confidence or higher — below that it's flagged inconclusive.
Yes. Plans are month-to-month and you can cancel from billing in one click. Your results export is always available.