🔥 Tier 1 - Must KnowID: viralCoefficientKFactor
Viral Coefficient / K-Factor
The average number of new users generated by each existing active user
In Simple Words (Zero Jargon):
How many new friends one user invites to your app on average. If $K > 1.0$, your app grows virally on its own without paid ads.
Official Mathematical Equation
K-Factor = (Number of Invites Sent per User) × (Conversion Rate of Those Invites)
Why It Is Critical
Even if $K = 0.4$, every 100 paid users bring in 40 free users, dropping your blended CAC by almost 30%.