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LAB / 05 · Concept

FOUC Simulator

See how content flicker contaminates perception, behavior and experiment validity.

Read the field note
Sequence showing original content flickering into an experiment variant
05 / EXPERIMENTS

01 / CONTEXT

The problem

When a visitor sees the control before the variant appears, exposure is no longer clean. The simulator concept makes that invisible validity problem tangible.

02 / CAPABILITIES

What it does

  1. 01

    Compare clean and flickering variant delivery.

  2. 02

    Adjust the delay before the treatment appears.

  3. 03

    Connect visible flicker to measurement and behavior risks.

03 / SYSTEM

Privacy & architecture

An interactive concept derived from the research and implementation notes in the accompanying article.

Built with

  • A/B testing
  • Performance
  • Behavioral UX

04 / HONEST NOTES

Known limits

  • This is currently an explanatory concept, not a production diagnostic.
  • Actual flicker must be measured on the target site and network conditions.