To gauge product-market fit, measure how many users return to your product after a week or 30 days, and aim to exceed industry benchmarks for retention.

Retention is the most reliable way to measure product-market fit; it indicates whether users continue to find value in your product.

To measure product-market fit, identify a metric that reflects the value your customers derive from your product and track its repeat usage.

Using surveys to gauge product-market fit can be biased; instead, focus on measuring actual user retention.

Measuring retention is critical; if you don't have a product that retains users, you shouldn't focus on growth yet.

The key to achieving product-market fit is to continue iterating until you find something that resonates with users, rather than relying solely on metrics like signups.

To address retention issues, you can improve your product and directly ask users why they aren't using it, then solve those problems for another chance at success. Additionally, sometimes you need to revisit the product-market hypothesis and consider changing the target audience or the problem you're solving.

Products lacking product-market fit typically see user engagement decline to zero, while those with fit will stabilize at a certain retention rate, ideally between 20-30%.

Signs of product market fit include high retention on a broken product, major brands using your SaaS product, and strong customer feedback even from a small group.