A Free-Trial Usage Rule Written for Subscribers Can Cost You Customers

A software founder found that the usage cap for his salon app's 14-day free trial reused the monthly reset rule meant for paying subscribers. As a result, a trial spanning a month boundary received two allowances instead of one, costing him margin. He also realized the same flaw could wrongly block active trial users mid-trial, and could lock demo accounts permanently. He recommends writing the trial rule in a single clear sentence and testing edge-case dates such as month ends and February. Checking each customer type separately, he argues, can prevent these errors from going unnoticed for months.