Growth Loops

A growth loop breaks that pattern. In a loop, the output of using the product feeds back in as new input - each user you win helps produce the next one, so growth builds on itself instead of depending on how much you can spend today. The products that seem to grow effortlessly - the ones "everyone's suddenly using" - almost always have a loop doing the work quietly underneath.

For a designer, loops are the highest-leverage thing in this whole domain. A funnel you optimize one screen at a time; a loop you design - and the single step you design well can turn linear growth into compounding growth.

Growth Loops vs Funnels

The funnel and the loop are two mental models for how growth happens, and which one you carry in your head changes every decision you make about it. Neither is wrong - they answer different questions - but confusing them is why teams pour money into a leaky funnel when they should be building a loop.

The Funnel: Linear

A funnel is a one-way path: awareness → acquisition → activation → revenue. Users enter at the top, some fall out at each stage, a fraction come out the bottom as customers. It's a genuinely useful model - it shows you exactly where people drop off in a single pass, which is why every experiment in the last module targeted a funnel stage.

Its limit is baked into the shape: it has no memory. Nothing about the customers who came out the bottom helps bring the next batch. To grow, you refill the top - more ads, more spend - and the day the budget stops, so does the growth. Funnels are linear, and linear growth is a treadmill.

The Loop: Compounding

A growth loop bends the end of the funnel back to the start. The output of one cycle becomes the input to the next:

A user joins → they do something → that something brings a new user → who joins and does the same.

Because each turn feeds the next, growth compounds instead of just adding up. Ten users bring more users, who bring more still. And a working loop is defensible - a competitor can copy your ad, but they can't easily copy an engine that's been spinning and accumulating for two years.

The Main Types

Loops come in a few recognizable flavors:

• Viral loop - using the product exposes new people to it. You send someone a Calendly link; now they've seen Calendly.
• Content loop - users (or the product) create content that pulls in strangers. Every public question on a Q&A site is a page that ranks in search and brings the next visitor.
• Paid loop - revenue from customers funds acquisition of more customers. It only loops if each customer is worth more than they cost to get.

Use Both

This isn't loop versus funnel - it's both, at different zoom levels. Use the funnel to analyze a single pass and find where users leak; use the loop to design how the whole thing feeds itself. Fix the funnel's worst leak and strengthen the step that closes the loop, and you get compounding growth on a path that doesn't drain out the bottom.

Pro tip: Ask of your product: "If I turned off all paid marketing tomorrow, what would still bring new users?" The honest answer is your loop. If the answer is "nothing," you don't have one yet - and that's the most important thing to build.

Where AI Helps

Prompt: "Here's how my product works and how people currently find it: [describe]. Identify whether it has a real growth loop, name the type if so, and map the cycle step by step - or tell me the loop is missing and where one could be built."

AI maps the candidate loop; you judge whether it actually spins.It's good at naming the loop type and sketching the cycle, but whether each step really drives the next - or just looks good on a diagram - is something only your data and your knowledge of user behavior can confirm.