How to validate a startup idea before you build it

Most side projects don't fail because they're badly built. They fail because nobody wanted to pay for them, and the maker found out after months of work.

Validation means finding that out first. Not whether people like the idea, but whether they'd pay for it.

1. Write the one-line pitch

If you can't explain it in one line, strangers won't get it either. Write what it does and who it's for, in words a customer would use. "Screenshot a table, get a spreadsheet" beats "AI-powered data extraction platform".

2. Put up a simple page

A landing page with the one-liner, a screenshot or mockup, and a way to sign up is enough. You don't need the product yet. You need something people can react to.

3. Ask strangers, not friends

Friends say "looks great" because they like you. Upvotes and likes cost nothing. The question that matters is "would you pay for this?", asked to people who owe you nothing.

On Would you pay? you add your page and real people swipe right only if they'd pay. Once 10 people have voted you see the share who'd pay and whether they're developers, founders or marketers.

4. Compare, don't guess

A single number means little on its own. What helps is how your idea does next to others in front of the same crowd. If you're well above the average, keep going. If you're far below, change the pitch or the idea before you build more.

5. Follow up with the people who said yes

A yes is a reason to talk, not a sale. Invite the people who said they'd pay to a waitlist or a pre-order. The ones who actually join are your first real signal of demand.