── ── Startups
Referral Loop Design — Turn Customers into a Channel
A referral loop is a repeatable cycle where using the product produces new users: a happy customer is prompted, at the right moment, with the right incentive and an easy share, and the new user enters the same loop. Loops compound; one-off "refer a friend" banners don't. Referrals only work on a product people already value — they amplify love…
Run Referral Loop Design — Turn Customers into a Channel on a real problem
Bring something you're actually deciding — free, in the browser.
How it works
1. Verify the precondition — strong retention/NPS. Gate: referring a product people don't love just spreads churn — fix retention first. 2. Pick the trigger moment — right after a value peak (a win, a result, an "aha"), not at signup. (Pairs with peak-end thinking.) 3. Choose the incentive type — double-sided (giver + receiver), status, or pure delight — matched to the audience's motivation. 4. Remove friction — one-tap share, pre-written message, obvious reward. Gate: any extra step halves participation. 5. Close the loop — the referred user lands in an experience that gets them to their own value fast, then hits the same trigger. 6. Instrument K-factor — invites sent × conversion; iterate the weakest step. Gate: K without measuring each step = you can't tell what to fix.
When to use it
- a founder wants customers to bring customers
- 'how do we get referrals / word of mouth', designing a referral program, improving virality
- loops, incentives, timing
When not to use it
the product has weak retention/love (fix that first — referrals amplify a leaky bucket).
Worked example
Referral Loop Design — Turn Customers into a Channel
A referral loop is a repeatable cycle where using the product produces new users: a happy customer is prompted, at the right moment, with the right incentive and an easy share, and the new user enters the same loop. Loops compound; one-off "refer a friend" banners don't. Referrals only work on a product people already value — they amplify love…
Install this skill (free, MIT)
npx skills add deciqAI/knowledge-skillsUseful? Star the repo — stars help other builders find it.
Related mental models
Innovations spread on a sigmoid (S-shaped) curve: slow → accelerating → leveling off at saturation.
Every business follows an S-curve: slow start, steep growth, peak, then decline.
Treats personal growth as three orthogonal dimensions — Height (mission vantage), Width (perspective breadth), Depth (self-awareness accuracy) — each with a distinct mechanism and failure mode.
Switching costs are everything a customer must pay, learn, redo, or risk to move from one product to another — financial, learning, data migration, integration, process…