The true indicator of Product-Market Fit isn't how fast you can sign up new users, but how effectively you can retain them. High growth with high churn is a false signal that leads to a plateau, not compounding growth.

The current AI hype cycle can create misleading top-of-funnel metrics. The only companies that will survive are those demonstrating strong, above-benchmark user and revenue retention. It has become the ultimate litmus test for whether a product provides real, lasting value beyond the initial curiosity.

Instead of optimizing for retention metrics, April's founders set an extremely high bar for their own use. By ensuring the product was reliable enough for their own critical tasks, like sending investor emails, they naturally built a product with strong user retention.

Successful onboarding isn't measured by feature adoption or usage metrics. It's about helping the customer accomplish the specific project they bought your product for. The goal is to get them to the point where they've solved their problem and would feel it's 'weird to churn,' solidifying retention.

Don't just sell a product; become an indispensable part of your customer's workflow. By offering integrated products and services, you create a value ecosystem that locks out competitors and makes leaving an impractical and undesirable option.