Review
Cohort leakage reading
We follow one signup month through renewals, discounts, and silent expiry so the pretty retention curve is no longer the only story in the room.
A leakage reading takes a single signup month (or a tightly defined acquisition source) and follows every person through the first three paid cycles. We mark who left because a card failed, who left because a discount ended, and who still holds access without a charge.
The pack is a set of tables and a two-page letter. It is useful before a pricing change or before you tell a board that “retention is stable”. We will not average the months together to hide a bad week.