Attract
Live estimate
Effort: Medium
What to notice
Moving a slider rewrites the price or savings on the spot.
How to build it
- Pick the one to three inputs that matter most and turn them into sliders or options.
- Update the result immediately and state the assumptions below it.
- Place the CTA beside the result and carry the inputs into sign-up.
Measure
- Main metric
- Sign-up rate among people who adjusted it
- Guardrail
- Support requests about estimate versus invoice
When it backfires
Defaulting to the cheapest-looking inputs breeds distrust when the real price arrives.
Theory behind it
Response-time limits
Under 0.1 seconds feels instant, under 1 second keeps the flow of thought, and over 10 seconds loses attention.
Well supported
Self-Determination Theory
People keep going on their own when they feel autonomy, competence, and relatedness.
Well supported
IKEA effect
Things people build themselves feel more valuable than the same things made by others.
Limited evidence
Playable demos
Try the same mechanism in a playable demo.