Usually a request for reassurance. The useful version is narrower: is there evidence anyone will pay, and can you reach them?
Asking whether your SaaS idea is good enough is usually a request for reassurance. The useful version of the question is narrower: is there evidence anyone will pay, and can you reach them? Five tests answer that, and none of them requires building anything.
Three of five is a go. Fewer than two means you are choosing difficulty with no compensating advantage.
Notice what is missing: whether the idea is original, whether the market is large, and whether it excites you. Those feel like the important questions and none of them predicts whether a solo founder can build a business from it.
"Is it original?" Originality is close to irrelevant and often a warning sign. If nobody is doing it, the most common explanation is that people have tried and found no money in it. Competition is the cheapest demand evidence available.
"Is the market big enough?" Market size does not discriminate between ideas a one-person business can execute. A niche of four thousand people you can reach beats a market of four million you cannot.
"Am I excited about it?" Enthusiasm helps you persist and tells you nothing about demand. Plenty of founders have sustained two years of effort on ideas nobody wanted.
| Test | How to check | Fail signal |
|---|---|---|
| Existing spend | Ask ten prospects what they pay for anything related | Nobody pays anything, anywhere |
| Recurrence | Ask how often the problem occurs for one person | Annually or once |
| Reachability | Name the forum, list or event where they gather | You can only name a demographic |
| Unprompted description | In ten conversations, count who raises it first | Fewer than three |
| Domain advantage | Have you done this work yourself? | You are guessing at the workflow |
The first three are the ones that matter most, and they are the ones founders skip because they require talking to people rather than thinking. The nine-test validation checklist is the fuller version once you have cleared these.
Worth naming honestly: most people asking this question have already decided, and are looking for someone to confirm it. That is a normal thing to want and it is also why the question resists a useful answer — a yes and a no would both be taken as opinion.
The way out is to replace the judgement with evidence. Instead of asking whether the idea is good, go and find out whether three people will commit something real — a pre-order, a pilot date, an introduction to whoever holds the budget. Three commitments from ten conversations settles it in a way no opinion can.
A quicker test than all five: can you name one specific person, by name, who has this problem right now? If you cannot, the idea is still an abstraction, and abstractions always sound plausible.
| Score | Verdict | Next step |
|---|---|---|
| 4–5 of 5 | Strong. Stop evaluating. | Price it, then set a launch date |
| 3 of 5 | Go, with a narrower segment | Pick the group that scored on reachability |
| 2 of 5 | Weak but salvageable | Re-run against a different buyer |
| 0–1 of 5 | Stop | Take the learning to the next idea |
If you have two ideas scoring similarly, the tie-breaker is reachability every time — choosing between two SaaS ideas covers the full ordering.
Do not start building. The first job is pricing, because a price set after launch is far harder to correct than one set before — pricing with no customers covers the method.
Then decide what evidence would make you stop. Writing kill criteria while you are still neutral is the only reliable defence against deciding later, when you are not — when to kill a SaaS idea covers the four signals.
And if the honest answer is that you have not spoken to enough people to score any of this, that is the actual next step. Validating with no audience covers finding ten strangers who have the problem.
The useful version of that question is whether anyone already pays to solve the problem and whether you can reach those people. Five tests answer it: existing spend, monthly recurrence, reachability, unprompted description, and domain advantage. Three of five is a go.
No, and originality is often a warning sign. If nobody is doing it, the most common explanation is that people tried and found no money in it. Existing competitors are the cheapest demand evidence available to you.
Market size rarely discriminates between ideas a one-person business can execute. A niche of four thousand people you can reach beats a market of four million you cannot, because distribution is the binding constraint for a solo founder.
Name one specific person who has the problem right now. If you cannot, the idea is still an abstraction and abstractions always sound plausible. After that, ask ten prospects what they currently pay for anything related.
That is a normal thing to want, and it is why the question resists a useful answer — both a yes and a no would be taken as opinion. Replace the judgement with evidence by seeking three real commitments from ten conversations.
Describe the idea and who has the problem. Marcus scores it and names the test you are closest to failing.
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