Most founders already know they should test an idea before building it. What usually stops them is not laziness but structure: it is hard to judge your own idea honestly when you are excited about it. A short, structured check gives you a list of the weak spots to go and test, instead of a vague feeling that it will probably work.
The short version: Wizeb's Startup Idea Validator is a free tool that scores a startup idea out of 100 in about three minutes. You paste your website or describe the idea, answer up to 8 questions, and get a scorecard with your score, where the idea sits on a landscape from "Mediocre" through "Not sure" to "Fertile soil", and a suggested next move.
Disclosure: Wizeb is run by the same founder as Remindavo. We are writing about it because a lot of our readers are founders and small teams, and it is free to use.
How It Works
It reads what you share. Give it your website address or a written description. There is an optional box for anything your site does not say. It also looks at the companies already working nearby.
It asks what is unclear. Up to 8 questions, one at a time, and only where the evidence is thin, so a well-explained idea gets fewer questions.
You get a scorecard. A score out of 100, your place on the landscape, and your next move.
Where the 100 Points Come From
The score is built from ten patterns drawn from NFX's study of the ideas that became the biggest companies. Each pattern carries a different weight:
| Pattern | Points | The question behind it |
|---|---|---|
| Network effects | 15 | Does it get better for everyone as more people join? |
| New energy | 12 | Is it close to something that already works, with 2–3 obvious changes? |
| Market math | 12 | Reachable customers times revenue per customer. |
| Risk profile | 10 | Execution risk you can handle, not a stack of unknowns. |
| Timing | 10 | A real platform shift, not a slow cultural trend. |
| Founder mindset | 10 | Founders who play to win and pivot on data. |
| Scalable | 8 | Software margins and distribution that scales. |
| Simple, skateboard first | 8 | One sentence, and a small first version that ships. |
| Talent & ecosystem | 8 | The best people, in a place that compounds. |
| Core transaction | 7 | Who pays whom, for what, and why now. |
Even if you never run the tool, the list is a useful checklist. If you cannot answer "who pays whom, for what, and why now" in one sentence, that is worth knowing before you write any code.
Using It From Your Own AI Agent
If you already work in an AI tool, you do not have to use the web form. The page gives a ready-made prompt and an MCP server address, https://wizeb.com/mcp, with set-up options for Claude Code, Codex, Cursor, Windsurf, Claude, ChatGPT and others. Your agent connects to the server, interviews you one question at a time, and saves the scorecard on Wizeb with its own link.
What to Do With Your Score
A score is a structured opinion, not proof that people will pay. The most useful part of the scorecard is usually the low-scoring patterns, because they tell you what to go and find out. A practical way to use it:
Pick the two weakest patterns. Turn each one into a question you can only answer by talking to customers, for example "Would a 10-person agency pay $50 a month for this?"
Book short discovery calls. Ten conversations with the people you want to sell to will teach you more than another week of building.
Re-run it with what you learned. Add the new evidence in the description box and see whether the weak spots have moved.
Do Not Miss the Calls That Matter
Validation runs on conversations, and early-stage founders tend to book a lot of them around everything else they are doing. A no-show on your side with a potential customer or investor is an expensive mistake. Remindavo can phone you before each event on your Google or Outlook calendar and read out the event title, so a silent notification is not the only thing standing between you and that call. If you work with a small team, Remindavo Teams gives everyone the same reminder calls, and freelancers may find our guide to never missing a client call useful.