# Sticky mobile filter button on collection pages: -16.0% conversion

- Outcome: Lost
- Page type: Collection page (Ecommerce)
- Elements: Filters, sorting & site search
- 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/sticky-filter-button-on-mobile-collection-pages/
- Page: https://liftarchive.com/test/cleancommit-sticky-filter-button-on-mobile-collection-pages/

Fixing the filter button to the bottom of the screen on mobile collection pages cut conversion rate 16.0%. Clean Commit ran this test for an anonymized Shopify store and published it in its A/B test library. The original had a 95.7% probability of performing better, though the test lasted only five days.

## Result

**-16.0% conversion**

- Conversion rate: -16.0%, with a 95.7% probability that the original performs better.
- Orders: -16.4%, a clear drop in buyers.
- Revenue per visitor: -5.0%. Average order value rose 11.6%, which softened the loss.
- Add-to-cart rate: -4.2%, so fewer shoppers got as far as the cart.

## Control

The mobile filter button sat in its normal place on the collection page and scrolled away with the content.

## Variant

The filter button stayed fixed to the bottom of the screen as shoppers scrolled. Tapping it opened the same filter panel as before.

## Why it likely lost (our reading)

- A button pinned to the bottom of a small screen covers part of the product grid and may feel in the way.
- Bottom-of-screen space on mobile is often used for chat widgets or cookie bars, so the button may have clashed with them.
- A constant prompt to filter may pull shoppers into narrowing options instead of picking a product.

## Caveats

The test ran just 5 days on 14,858 mobile visitors, which is short and may miss weekly patterns. Order value rose 11.6%, so the revenue cost was smaller than the conversion drop.

## How to run this test

- Hypothesis: If we keep the mobile filter button fixed on screen, then more shoppers will filter and find products because the button is always in reach.
- Primary metric: Mobile conversion rate
- Guardrail: Add-to-cart rate
- Guardrail: Revenue per visitor
- Guardrail: Filter usage rate
- Who should test it: Stores with large mobile catalogs where filter use is low. Run it for at least two full weeks; if your product grid is already short, a sticky button is unlikely to help.

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Credit: Clean Commit ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/cleancommit-sticky-filter-button-on-mobile-collection-pages/).
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.