# Growth Loops **Category:** general **Short Description:** Self-reinforcing systems where the output of one user's actions becomes the input that drives new users. **Last Updated:** 2026-06-09T00:00:00Z ## Definition Growth Loops are self-reinforcing systems in which the output produced by users is reinvested as input that generates more users or engagement — creating compounding, self-sustaining growth. Popularized by Reforge (Brian Balfour and team), the loop model reframes growth away from the linear, top-down funnel toward closed systems where product, channel, and monetization work together. Each loop has a clear trigger, an action, and an output that feeds back into the start — for example, a user creates content that ranks in search, attracting new users who create more content. ## Examples - Content/SEO loop: users create content that ranks in search and attracts new users who create more - Viral/referral loop: users invite others to unlock value, and invitees invite still more - Paid loop: revenue funds acquisition that produces more paying users to reinvest ## How AdSights Helps **Tracking Growth Loops:** Paid acquisition is itself a growth loop — revenue funds spend that acquires users who generate more revenue — and its strength depends on creative efficiency. AdSights tightens that loop by identifying the creatives and audiences with the best return, so each turn of the paid loop reinvests more efficiently. It also helps seed other loops, by attracting the kinds of users (creators, collaborators, advocates) whose actions feed content, referral, and engagement loops. ## FAQs ### What are growth loops? Growth loops are self-reinforcing systems where the output of users' actions is reinvested as input that drives more users or engagement, creating compounding growth. Reforge defines them as closed systems where inputs, through some process, generate more output that can be reinvested in the input. Unlike a funnel that ends at conversion, a loop feeds its result back to the beginning, so growth compounds rather than requiring constant new top-of-funnel injection. ### How do growth loops differ from funnels? A funnel is linear — you pour traffic in the top and a fraction converts at the bottom, then you need fresh traffic to do it again. A growth loop is circular — the output of one cycle (content, referrals, revenue, data) becomes the input for the next, so the system compounds on itself. Loops combine product, channel, and monetization into one system, making them more durable and harder for competitors to copy than a generic funnel. ### What are the main types of growth loops? Common types include viral/referral loops (users invite users), content loops (user- or company-generated content attracts new users via search or sharing), paid loops (revenue funds acquisition that generates more revenue), and sales loops. Many products run several loops simultaneously. The strongest loops are specific to the product — for example, a marketplace where more supply attracts more demand, which in turn attracts more supply. ### How do you build an effective growth loop? Identify the trigger that starts the loop, the action users take, and the output that can be reinvested — then close the loop by channeling that output back into acquiring or engaging more users. Measure loop efficiency (how much output each input produces) and cycle time (how fast the loop turns), and work to improve both. Crucially, tie the loop to genuine value delivery, so growth compounds on satisfied users rather than gaming a metric. ## Related Terms ### Child Terms - **[Viral Coefficient (K-Factor)](/resources/glossary/metrics/viral-coefficient-k-factor)**: The K-factor quantifies the strength of a referral/viral growth loop ### Similar Terms - **[Product-Led Growth (PLG)](/resources/glossary/general/product-led-growth-plg)**: PLG relies on product-driven growth loops rather than linear funnels - **[Viral Marketing](/resources/glossary/general/viral-marketing)**: Viral marketing is one expression of a referral growth loop ### Opposite Terms - **[Marketing Funnel](/resources/glossary/general/marketing-funnel)**: Loops are the compounding alternative to the linear funnel model