A/B Testing the Checkout Flow: Startup Learnings from SwapCart's Mobile Redesign

Tech · 4 min read

SwapCart’s mobile checkout had a multi-step flow with dense forms and optional upsells, leading to abandonments on payment entry. The product team hypothesized two fixes: a one-page checkout that prioritized essential fields and a progressive disclosure version that reduced initial cognitive load by hiding nonessential options.

They ran parallel experiments across cohorts: the one-page version streamlined fields and surfaced saved payment methods, while the progressive version deferred upsells and optional fields until after payment confirmation. Both versions were instrumented for conversion, error rates, and time-to-complete metrics.

The progressive-disclosure design increased completed purchases by 9% without increasing post-purchase support contacts, while the one-page flow improved speed but led to a slight uptick in payment errors. SwapCart learned to separate speed optimizations from error-prone inputs and to test progressive reveals for optional commerce choices.