ValidationBy Day Zero
How to validate a SaaS idea before you build it
The strongest validation is a payment. Talk to people with the problem, show them something, then ask a small group to pay for lifetime access before you build the whole thing.
In short
- Likes, upvotes and signups are weak signals. Payments are strong ones.
- Validate in steps: talk to people, show a prototype or mockup, then ask for a pre-sale.
- Keep the pre-sale small and all or nothing, so a no costs you a week, not a year.
Validating a SaaS idea means getting evidence that people will pay for it before you spend months building it. The most reliable evidence is people paying. Compliments, upvotes, signups and survey answers tell you about interest, which is much cheaper to give than money.
Step 1: Talk to people who have the problem
Find people who have the problem today. Ask how they deal with it now, what it costs them, and what they've already tried. Don't pitch. You're looking for a problem people already spend time or money on.
Step 2: Show them something
Make the smallest thing that shows the idea: a clickable Figma mockup, a landing page, a screen recording of a prototype. If people can't picture it, they can't tell you whether they'd pay for it.
Step 3: Ask for money
This is the step most founders skip. Offer a limited number of founding seats as a lifetime deal: one payment, lifetime access. If the people who said they love it won't pay a small amount for lifetime access, that's the answer you needed.
Make it all or nothing with a clear goal. If enough people commit, you have revenue, your first customers and a reason to build. If not, nobody is charged, and you learned it before writing the code.
Step 4: Build with the people who paid
Founding customers who paid will tell you what to build next. Post updates, ask them questions, and let them shape the first version.
Validation signals, weakest to strongest
- Likes, upvotes and compliments
- Waitlist signups
- Calls and replies where people describe the problem in detail
- Pledges with a card
- Payments
Running the pre-sale on Day Zero
Day Zero runs step 3 for software founders. List your product with a prototype or mockup and a short video, choose 10 to 100 founding seats at $10–$150, and share your link. The campaign is open for a week and is funded if half the seats are pledged. Backers are charged when you open access, which is due within 90 days after the campaign ends. Listing is free. Compare it with a waitlist in waitlist vs. pre-sale.
Questions
How many paying customers validate an idea?
There's no universal number. What matters is that people paid without being pushed, ideally some you didn't already know. On Day Zero you set the bar yourself: the goal is half the seats you choose, so 20 seats means 10 pledges.
Can I validate an idea without a prototype?
You need something to show. A Figma mockup or a landing page that explains what you're building, plus a short video, is enough to list on Day Zero.