From side project to $4k MRR, month by month
Eighteen months of a bootstrapped tool's revenue, including the four months it went backwards.
Growth stories are almost always written after the fact by people who already know it worked, which makes them useless as a guide for anyone still in the middle of it.
The interesting part of this curve is not the top. It is months nine through twelve, when revenue fell for four consecutive months and the obvious diagnosis — churn — turned out to be wrong.
What had actually happened was that a single acquisition channel stopped working. New signups fell by roughly two-thirds while retention held steady, so total revenue declined slowly enough that it took two months to notice and another two to correctly attribute.
The lesson that generalises is about instrumentation, not marketing. A revenue chart alone cannot distinguish a retention problem from an acquisition problem, and those have opposite fixes. Cohort data can, and it costs nothing to keep from day one.
By month eighteen the curve had recovered, but through a different channel than the one that broke. Nobody plans that. It is worth saying plainly because the version of this story that omits the flat four months is the version that makes other founders feel like failures.
Sources
- Definition of MRR and ARR — Investopedia · retrieved 2026-07-28
Part of the guide: Validating a product before you price it.