Does a fixed order summary bar lift mobile checkout conversion?

Our mobile checkout did not keep the order in view as visitors scrolled. We tested a fixed bar showing the vehicle, service and total. Over 16 days, conversion rose 1.6%, short of our confidence bar.

Not significant Mobile 16 days Not called

SURFACE

Checkout

DEVICE

Mobile

VERTICAL

Ecommerce (B2C)

PRIMARY METRIC

Conversion rate

VARIATIONS

1

The hypothesis

By keeping a fixed bar with the visitor's order in view, we will remind them what they are buying, resulting in more completed purchases.

On a phone, the order details scroll out of view as visitors fill in the form. A steady reminder of the vehicle, service and total could keep the purchase front of mind through each field.

What we changed

A fixed bar showing the year, make, service and total

Var A added a bar fixed across the width of the mobile screen. It repeated the year, make, service and total the visitor had picked. Tapping the bar took visitors to the order summary.

VAR A: REGISTRATION BAR

Fixed bar across the mobile screen
Shows year, make, service and total
Tapping it opens the order summary

The result

Conversion rose 1.6% with the summary bar, short of our confidence bar

CONVERSION RATE

+1.6%

Over 16 days, the summary bar converted 1.6% better than the original. It showed positive movement through the test but never reached our confidence bar, so we paused it.

What we would do next

Build on the bar to grow the lift

The bar did no harm and showed a small lift. A next test would keep the bar and add changes that could make the lift large enough to call, such as fewer ways to leave the checkout.