Ali Demirbaş - Lab
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UI Elements

Adding a Live Chat Button to the Page: A/B Test Idea

A visible support route may help visitors resolve a question before leaving.

  • UI elements
  • Purchase conversion rate (CR)

Control vs Variant

Absent on one side, present on the other.

Changed
Presence
Page
UI elements
Difference
added

Hypothesis

It can also increase contact volume and take up screen space. The comparison requires a consistent response standard; a button promising live help is not useful when requests go unanswered.

How to run this test

Primary metric

Purchase conversion rate (CR)

Compare purchases per eligible assigned visitor, not only among those who start a chat.

Other metrics

  • User-started chat rateMeasure chats initiated by the user among eligible assigned visitors who see the button.
  • Support response timeAmong started chats, measure time to the first human response and account for support hours.
  • Page exit rateCompare exits among eligible assigned visitors in the same session window.
  • Primary CTA completion rateCompare completion of the action linked from the main CTA using the same denominator.

What to check before and during the test

  • ButtonAdd one live-support entry point without opening the chat automatically.
  • ServiceKeep team availability, working hours and response standards consistent.
  • PlacementUse one fixed position.
  • Page scopeDefine eligible pages before launch.
  • MobileCheck that the button does not overlap content or purchase controls.

Setup mistakes to avoid

  1. 1Do not show live support when the team cannot respond.
  2. 2Change button presence only, not its position.
  3. 3Do not cover the primary CTA.
  4. 4Do not require personal information before a chat starts.
  5. 5Do not declare success from chat starts alone; review purchases and response time.