Paying for every user when product should spread itself
Every time someone uses your product, someone who doesn't have it sees it working. That's the best ad you'll ever run.
When to use
Your product naturally involves interaction with people who don't use it—scheduling, payments, collaboration, sharing.
Hypothesis template
If our product naturally reaches people who don't have it, some of them will sign up because they saw it work.
Method
The problem: You're paying for every user. Your competitors seem to grow
on their own. What gives?
How Calendly grows: Every user sends scheduling links to people who don't use
Calendly. Those people see Calendly work, experience how easy it is, and some
sign up. The product IS the marketing.
The math:
- User sends ~10 scheduling links/month
- Half of recipients have never seen Calendly
- 5% of new recipients sign up
- That's 0.25 new users per user, compounding forever
- Calendly became a $3B company mostly through this
Does your product do this?
- Scheduling tools → invites go to non-users
- Payment tools → invoices go to non-users
- Collaboration tools → shared docs reach non-users
How to make it work:
- Find where your product naturally reaches outsiders
- Make sure that touchpoint shows your value (not just your logo)
- Add a simple, non-annoying "get this for yourself" option
- Let them experience value before requiring signup
Success metrics
- •Viral coefficient (K-factor)
- •Exposures per user
- •Exposure → signup rate
- •Cost vs paid acquisition
Prerequisites
- Product that reaches non-users naturally
- Value that's visible to the recipient
- Low-friction signup
- Tracking in place
Common pitfalls
- •Trying to force virality that isn't natural
- •Aggressive CTAs that annoy recipients
- •Requiring signup before showing value
Source: Calendly. Built to $3B mostly through product-led growth.
Suggested ICE scores
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