# Reviews at top plus sticky add to cart: +72.90% conversion rate

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Reviews & star ratings, Sticky add-to-cart bars
- Test run by: [ConvertPolo](https://liftarchive.com/practitioners/convertpolo/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://wingify.com/success-stories/evolv/
- Page: https://liftarchive.com/test/evolv-pdp-reviews-top-sticky-atc/

An enhanced reviews section at the top of the product page, paired with a sticky add-to-cart button, raised ecommerce conversion rate by 72.90%. ConvertPolo ran this A/B test for hydrogen water bottle brand Evolv, and it was published as a VWO case study. The winner combined two changes, so the lift can't be credited to either one alone.

## Result

**+72.90% conversion rate**

- Add-to-cart clicks: +17.54% for variant 1.
- Ecommerce conversion rate: +72.90%.
- Thank-you page visits, a proxy for purchases: +43.43%.
- Results for variant 2 were not shared, so the gap between top and lower review placement is unknown.

## Control

The product page had a basic reviews section and a static add-to-cart button.

## Variant

Variant 1 put an enhanced reviews section at the top and added a sticky add-to-cart button. Variant 2 placed the reviews below the description with the same sticky button; variant 1 won.

## Why it likely won (our reading)

- Evolv sells a premium product, and reviews up top give proof of value before shoppers lose interest.
- A sticky button keeps the buy action in reach as shoppers scroll through details.
- Since variant 1 beat variant 2 and both had the sticky button, review placement likely mattered, though the numbers weren't published.

## Caveats

The winner bundled two changes, and variant 2's results were not given. No sample size or duration for this test was shared; results were judged with Bayesian statistics.

## How to run this test

- Hypothesis: If we move a stronger reviews section to the top of the product page and make the add-to-cart button sticky, then more shoppers will buy because they see proof early and can act at any point.
- Primary metric: Product page conversion rate
- Guardrail: Add-to-cart rate
- Guardrail: Revenue per visitor
- Guardrail: Return rate
- Who should test it: Brands with premium or unfamiliar products and plenty of good reviews. If your reviews are few or mixed, putting them at the top may hurt.

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Credit: ConvertPolo ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/evolv-pdp-reviews-top-sticky-atc/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.