alunadev Growth Loops
Core Philosophy
Paid acquisition is a leaky bucket. Growth loops are a flywheel. The difference: in a paid model, growth stops when spending stops. In a loop model, each user or action generates the next one — the system compounds.
The goal is not to have the most impressive loop — it's to identify the one loop that is most natural to your product and build it first. One well-executed loop beats three half-built ones.
When to Use
- When designing the product growth model for a new product
- When paid acquisition costs are too high relative to LTV
- When defining how a new feature drives retention or acquisition
- When analyzing why a competitor is growing faster than their ad spend explains
The 5 Loop Types
1. Viral Loop
Users create content or output in-product, share it externally, and new users arrive.
- Mechanism: User creates → shares on external platform → new users discover and sign up
- Examples: Figma design links, Loom video shares, Canva published posts
- Strength: Exponential if content is naturally shareable
- Required: Shareable output that makes sense to share (not just a dashboard screenshot)
2. Usage Loop
Using the product more generates more value, which increases engagement and referrals.
- Mechanism: More usage → more personalized/valuable output → more engagement → more sharing
- Examples: Spotify's Wrapped, Duolingo streaks, GitHub contribution graphs
- Strength: Directly tied to product value — growth is proof of engagement
- Required: Product creates visible or shareable proof of value over time
3. Collaboration Loop
Users invite colleagues to work together, expanding the user base within organizations.
- Mechanism: User creates → invites colleagues to collaborate → colleagues experience product value
- Examples: Google Docs, Figma, Notion team spaces, Slack channels
- Strength: Deep organizational penetration + strong retention (hard to leave if your team is there)
- Required: Core value increases with more collaborators
4. User-Generated Content Loop
Users discover content from other users, create their own, and share it — driving discovery and creation.
- Mechanism: User discovers others' content → creates own content → shares → others discover
- Examples: TikTok, Pinterest, YouTube, Notion templates gallery
- Strength: Content flywheel — existing content attracts creators, creators attract viewers
- Required: Critical mass of quality content to sustain the loop
5. Referral Loop
Users refer others in exchange for rewards, recognition, or social currency.
- Mechanism: User refers → referred user joins → referrer earns reward → cycle continues
- Examples: Dropbox storage bonuses, Airbnb credits, PayPal signup bonuses
- Strength: Directly incentivized, measurable ROI
- Required: Strong enough incentive to motivate action without destroying unit economics
Workflow
1. Define Your Product's Core Action
What is the one action users take that creates value? (Share a design, complete a task, invite a contact, post content.)
2. Evaluate Loop Fit
For each of the 5 loop types:
- Is the core action shareable? → Viral / Usage / UGC Loop
- Does value increase with more users? → Collaboration Loop
- Is the incentive strong enough to motivate referral? → Referral Loop
Score each loop 1-5 for fit. Pick the top 1-2 to build first.
3. Design Loop Mechanics for Your Top Loop
- Trigger: What prompts the sharing or invitation action?
- Incentive: What motivates the user to complete the action? (Intrinsic: pride, convenience. Extrinsic: reward, recognition.)
- Friction: What could prevent the action? Remove it.
- Conversion: What % of invites/shares convert to new active users?
- Cycle time: How long does one loop iteration take?
4. Estimate the Loop Coefficient
Coefficient K = (Invites per user) × (Conversion rate)
- K > 1: Exponential growth
- K = 0.5-1: Strong growth boost, not standalone
- K < 0.5: Loop is present but minor
5. Define the Build Plan
- What's the smallest change to the product that activates this loop?
- What does "loop is working" look like in metrics?
- What's the 90-day measurement plan?
Output Format
## Growth Loop Design — [Product Name]
### Core Product Action
[The one thing users do that creates value]
### Loop Evaluation
| Loop Type | Fit (1-5) | Key Condition | Verdict |
|---|---|---|---|
| Viral | | | Build / Maybe / Skip |
| Usage | | | |
| Collaboration | | | |
| User-Generated | | | |
| Referral | | | |
### Primary Loop: [Loop Type]
- Trigger: [What prompts sharing/inviting]
- Incentive: [Why users take the action]
- Friction removed: [What we'll make easier]
- Estimated K coefficient: [X]
### Build Plan
- MVP change to activate loop: [Description]
- Success metric: [What we measure]
- 30-day goal: [Specific number]
Antipatterns
- Building all 5 loops: Spreading effort across every loop type before any one is working. One loop at K=0.8 is more valuable than five loops at K=0.1 each.
- Extrinsic incentives for intrinsic actions: Paying users to share something they'd share anyway dilutes authenticity and increases cost without increasing conversion.
- Ignoring cycle time: A viral loop that takes 6 weeks per cycle is effectively not a loop. Minimize the time between trigger and new user activation.
- Copying Dropbox blindly: Referral loops only work if the reward is meaningful relative to the product's value. A low-value product with a low-value reward won't convert.
- No measurement: Building a loop without defining the K coefficient metric means you can't tell if it's working.