Skip to content

Diagnostic question · Hooked

Time to bring in the next user

Measures the time from a user's sign-up to the sign-up of someone they invited, and which actions involve others.

Spread

Plain label: viral cycle question

The question we ask

How long from a user's sign-up to the sign-up of someone they invited, and which everyday actions naturally involve other people?

Limits

What we don’t claim

Sources

  • Hooked · Nir Eyal

    Ch.1

Source IDs: HK-Q119HK-MON04

Book content is paraphrased, never quoted at length. Last verified October 24, 2026.

Your product

Find the stage your product is stuck in

Gamify It reads your product, picks the one move that matters at its stage, and sizes the test to your traffic. Connecting is free; a Pro subscription starts it.