What Is a Growth Loop?
A growth loop is a closed cycle where the output of a growth action (a new buyer, a share, a piece of content, a review) feeds back as the input for the next turn, so growth compounds instead of running out. Unlike a funnel, which is linear and must be refilled from the top, a loop reinforces itself.
The difference between a funnel and a loop is where the next customer comes from. A funnel is linear: you pour attention in at the top and a fraction converts at the bottom, and when the top runs dry you have to buy or make more attention. A loop reuses its own output. Each turn produces something that starts the next turn. What loops look like across different products: - Store referral or unboxing loop: a buyer receives the product, shows it off or shares a referral link, and that brings the next buyer, who then shows it to someone else. - Course word-of-mouth loop: a student gets a real result, that result becomes a testimonial or a visible outcome, and the testimonial sells the next seat. - App sharing loop: a user invites a friend or shares output from the app, the friend installs it, and they invite the next person. - Newsletter forward loop: a reader forwards an issue, the new reader subscribes, and they forward a future issue in turn. An honest caveat: most products do not have a real loop, and that is fine. Calling a one-off referral discount a loop does not make it one. A true loop closes on itself so a customer you already have produces the next one you do not. And a loop with weak retention leaks faster than it compounds: if people churn or never come back, the output that should feed the next turn disappears before it can. Fix retention first, then a loop is worth building on top of it.
Why it matters
A loop changes the shape of your growth. A store, a course creator, an app maker, or a newsletter writer who only runs ads has a funnel: growth stops the moment spend stops. Even a paid channel behaves more like a loop when the revenue from this month's buyers funds next month's acquisition, so knowing whether you have a loop or a funnel tells you whether growth will compound or plateau.
Related terms
Frequently asked questions
What is the difference between a funnel and a loop?+
A funnel is linear and needs refilling from the top: attention in, a fraction out, then you buy more attention. A loop reuses its own output, so a buyer, share, or review from this turn becomes the input for the next. A funnel plateaus when you stop feeding it. A loop keeps turning on its own.
Does every product need a growth loop?+
No. Most products do not have a real loop and run on a funnel instead, which is a legitimate way to grow. A referral discount is not automatically a loop. Before building a loop, check retention: if buyers do not return or students do not finish, the loop leaks faster than it compounds, and a plain funnel serves you better.