What makes a startup idea worth building?

Building software has never been faster. Deciding what deserves to be built is still surprisingly difficult.

When you evaluate a new startup or SaaS idea, which signal carries the most weight for you?

• People are already searching for a solution
• Customers are willing to pay
• The product creates recurring value
• There is a realistic way to reach customers
• The idea matches your own experience or audience
• Something else entirely

While building Skoora, we created a framework that evaluates ideas across 10 commercial signals and ends with a Build, Explore, or Skip recommendation.

But I’m curious how other founders make this decision.

What is the one piece of evidence that moves an idea from “interesting” to “I’m building this”?