[ry0ohki]

When I was bootstrapping my startup while working a day job, I used to wonder how to answer that question. My product was bringing in more money then the company's costs, so it felt "profitable", yet not enough to employ me full-time. Seems like there is a difference between that and something that is just plain unprofitable (where the burn rate will eventually cause the bank account to go to zero).

[superqd]

The software doesn't write and maintain itself. So if the revenue can't cover the expense to write/maintain the codebase (i.e., dev salaries), then the app isn't profitable because one of the major costs can't be met out of revenue at 100%.