# Sister-brand switch banner in site nav: +46.84% conversion

- Outcome: Won
- Page type: Navigation & menu (Ecommerce)
- Elements: Navigation & mega menus, Announcement bars
- Test run by: [Blend Commerce](https://liftarchive.com/practitioners/blend-commerce/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://blendcommerce.com/blogs/ab-tests-shopify/46-84-increase-in-conversion-rate
- Page: https://liftarchive.com/test/pertronix-aeromotive-sister-site-nav-banner/

Adding a navigation banner that lets shoppers switch between two sister-brand sites raised conversion rate by 46.84% on PerTronix and 28% on Aeromotive. Blend Commerce ran the A/B test on both automotive parts sites. The banner was kept on both.

## Result

**+46.84% conversion**

- PerTronix conversion rate: +46.84%, with add-to-cart rate up 21.83% and average purchase revenue per user up 43%.
- Aeromotive conversion rate: +28%, with average purchase revenue per user up 49%.
- Aeromotive collection page visits: +0.88%, a very small change.

## Control

PerTronix and Aeromotive ran as separate sites with no links between them.

## Variant

Each site got a global navigation banner that let visitors jump to the sister brand's site.

## Why it likely won (our reading)

- Some visitors land on the wrong brand for the part they need. A switch link sends them to the right place instead of losing them.
- Linking the sites tells shoppers the brands are related, which may add trust.
- Both brands serve the same kind of car enthusiast, so the overlap in audience is high.

## Caveats

Results are reported separately for each site. Blend Commerce does not share sample size, test length or confidence.

## How to run this test

- Hypothesis: If we add a banner linking to our sister brand's site, then more visitors will find the right product and buy because the switch is easy.
- Primary metric: Conversion rate on each site
- Guardrail: Revenue per visitor per site
- Guardrail: Share of visitors who leave to the sister site
- Guardrail: Add-to-cart rate
- Who should test it: Companies running several related brands on separate stores with overlapping buyers. It will help less if the brands serve different customers or if the link drains traffic from the higher-margin site.

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Credit: Blend Commerce ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/pertronix-aeromotive-sister-site-nav-banner/).
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.