# Yellow to green buttons sitewide: +4.6% conversion, not significant

- Outcome: Flat / inconclusive
- Page type: Site-wide (Ecommerce)
- Elements: Add-to-cart & CTA buttons
- Test run by: [Clean Commit](https://liftarchive.com/practitioners/clean-commit/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://cleancommit.io/ab-tests/sitewide-button-color-update-from-yellow-to-green/
- Page: https://liftarchive.com/test/cleancommit-sitewide-button-color-update-from-yellow-to-green/

Switching every primary button from yellow to green lifted conversion rate 4.6% and add-to-cart rate 5.0%, but the conversion gain was not significant. Clean Commit ran this test for an anonymized Shopify store and published it in its A/B test library. Green clearly won on clicks, yet revenue per visitor rose only 1.7%, so we count it as inconclusive.

## Result

**+4.6% conversion, not significant**

- Click-through rate: green had a 98.2% probability of beating yellow, the clearest result.
- Conversion rate: +4.6%, and add-to-cart rate: +5.0%. Neither was significant.
- Revenue per visitor: +1.7% only, because average order value fell 2.2%.
- Mobile conversion rose 7.3%, but desktop fell 6.8%, a negative signal.

## Control

Yellow primary buttons across the site, including add to cart, view all and checkout.

## Variant

Green primary buttons with white or black text chosen for contrast and matching hover states. Secondary buttons stayed the same.

## Why it likely came out this way (our reading)

- Better contrast makes buttons easier to spot, which explains the click gain.
- More clicks do not always mean more orders, so the effect faded further down the funnel.
- Mobile and desktop moved in opposite directions, which suggests the color matters less than how it sits in each layout.

## Caveats

The conversion gain was not significant, desktop conversion fell, and sample size and duration were not shared.

## How to run this test

- Hypothesis: If we change primary buttons to a higher-contrast color, then click-through will rise because buttons are easier to see.
- Primary metric: Conversion rate
- Guardrail: Revenue per visitor
- Guardrail: Desktop conversion rate
- Guardrail: Average order value
- Who should test it: Stores whose main buttons blend into the page or fail contrast checks. If your buttons already stand out, a color change is unlikely to move orders.

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Credit: Clean Commit ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/cleancommit-sitewide-button-color-update-from-yellow-to-green/).
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.