Is My Startup Idea Good? How to Check Before You Build

Your startup idea is probably good if five things hold: someone has the problem often and already pays or works around it, something recently changed that makes it solvable now, people will pay enough to build a business, the market isn't locked up, and you can build a first version quickly. Check each against evidence, not opinion. Friends saying "great idea" is not evidence. Proofline scores ideas on exactly these five points, and you can score yours free.

What "good" actually means

An idea is not good or bad in the abstract. It is good for a specific buyer, at a specific moment, at a price they will accept. That is why a vague pitch ("AI for small businesses") is hard to judge and a narrow one ("quote builder for pressure washing crews") is easy to judge.

The most common way ideas fail is that nobody needs them. In CB Insights' review of 101 startup post-mortems, 42% of the failures were attributed to no market need, according to a summary of that report. So the first job is to test demand, not polish the pitch.

The five questions, in order of weight

Proofline weights the five factors differently, because they do not matter equally. Pain counts most. Ease counts least, since a hard-to-build idea with a desperate buyer still beats an easy one nobody wants.

The weighted sum is then multiplied by an evidence factor between 0.70 and 1.00. An idea backed by real comparables and verifiable signals keeps its score. One that rests on assumptions gets marked down. The full method is on the methodology page.

How to check your idea, step by step

1. Write it as one sentence with a named buyer

Use this shape: "[Specific person] struggles with [specific problem] and currently handles it by [workaround]." If you can't fill in the workaround, you may not have a problem yet. A workaround such as a spreadsheet, a paid assistant or a stack of paper forms is the best sign there is.

2. Look for people who already spend money or time on it

Find the existing alternatives: software, agencies, freelancers, manual routines. Their existence is mostly good news, because it shows people pay. Note what each one does badly, and be honest about what they do well. Our comparison pages set Proofline next to other idea tools.

3. Talk to ten people, and ask about the past

Rob Fitzpatrick's The Mom Test gives the useful rule: ask about the customer's real life and past behavior, not about your idea or hypotheticals, and listen more than you talk. A summary of the method suggests the customer should do most of the talking. Good questions: "When did this last happen?" "What did you do?" "What did that cost you?" Bad question: "Would you use this?"

Also, one reader's notes on the book point out that if ten customers all say different things, your segment is probably too broad. Narrow it.

4. Name the "why now"

Ideas that are only a bit better than what exists rarely win. Ideas that ride a change do. A new regulation, a platform opening an API, a cost curve dropping, or a habit that shifted after a big event can each be a reason. If you can't point to one, ask whether the idea would have worked five years ago. If yes, ask why nobody built it.

5. Check the money

Do a rough pass: price per customer, how many customers you can reach, how long a sale takes. A tool for a small group that pays $20 a month will not support a company. A tool for the same group at $200 a month, tied to a job that makes them money, might. Do not guess at market size from a big top-down number. Count real reachable buyers.

6. Score it, then argue with the score

Put numbers on all five factors, apply the weights, then apply the evidence factor. The result is only useful if you look at which factor is dragging it down. A low score on ease means "find a smaller first version." A low score on pain usually means "pick a different idea."

A worked example (illustrative numbers)

These numbers are made up to show the arithmetic. They are not a Proofline score for any real idea. Say you rate an idea on a 0 to 10 scale: pain 8, why-now 6, revenue 7, open market 5, ease 6.

• Pain: 8 × 0.30 = 2.40
• Why now: 6 × 0.25 = 1.50
• Revenue: 7 × 0.20 = 1.40
• Open market: 5 × 0.15 = 0.75
• Ease: 6 × 0.10 = 0.60

The weighted sum is 6.65. With solid evidence (×1.00) it stays 6.65. With thin evidence (×0.70) it drops to about 4.66. Same idea, same opinions, very different result. That gap is the cost of not having checked.

To see how this reads on real ideas with comparables attached, look at shift swaps for home care or a quote builder for pressure washing. Today's pick is on the daily idea page, and rankings are on the leaderboard.

Common mistakes

• Asking friends and family. They are kind, and kindness is not demand.
• Treating competitors as a bad sign. No competitors often means no buyers. Look for competitors that are weak, expensive or overbuilt.
• Starting with the technology. "We can build X" is not a problem statement.
• Picking a huge market with no entry point. A narrow niche you can reach this month beats a big one you can't.
• Ignoring the why-now. Without it, you are competing with every person who had the same thought.
• Scoring on hope. If you can't point to a comparable, a quote or a number, the evidence factor should punish you.

Score your idea

If you have a one-sentence version of your idea, score it free on Proofline. Then look for the weakest factor and decide whether to narrow the idea or drop it. Browse all scored ideas first if you want to see how others look, or check pricing for what else is available.