“There's a very fun CAC to first payment period — we make sure the CAC is lower than the first payment period and then the renewals are gravy.”

CAC Must Be Lower Than First Payment — Renewals Are Pure Gravy

Cliff's unit-economics discipline is simple: if CAC is covered by the first payment, every subsequent renewal is profit. This framing forces creative and channel decisions to optimize for first payment conversion, not just installs or trial starts. It also means the team can scale spend confidently because they know the math works on day one — they don't have to bet on long-tail retention to justify acquisition costs.