Customer Satisfaction

1 article

Startup founder observing a rising graph indicating successful product-market fit, with a team collaborating in the background.

What is the 40% Rule for Product-Market Fit?

Superhuman, a popular email client, famously moved from 22% to 58% of users saying they would be 'Very Disappointed' if they could not use the product.

Maya Rios·August 18, 2026