Free tools / What could kill your idea
Find the assumption most likely to kill your idea
The single riskiest thing you are assuming, and the fastest test that would prove you wrong.
Kasspian's totals across every read so far, not this tool's. Counted 1 Sept 2026.
Test this first
People will pay for this
Highest risk: impact 5 × uncertainty 4 = 20. Find the fastest test that could prove it wrong before you build anything else.
The full read
These numbers are only as good as the idea underneath them. Pressure-test the whole thing: market sizing from real sources, the risks that could kill it, and a 2-week test plan.
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The one thing most likely to sink it, and the fastest way to check it, in two minutes.
Every idea rests on assumptions. One of them is the one that, if wrong, kills the whole thing. List yours, rate each on impact and how sure you really are, and this worksheet ranks which to test first.
Risk score = impact × uncertainty. A high-impact assumption you're very unsure about is the one to test before you build anything else.
The fastest test that could prove an assumption wrong is worth more than months of building on top of it. For most assumptions that test is a handful of conversations with real potential customers.
This is the core of how Kasspian reads an idea: it names the killer assumption and the fastest way to test it. Run your idea through the full version for a second opinion backed by real sources.
Want proof it’s not made up? See real ideas run through this tool: the buyer, the spots, and the opener actually sent.
Questions
3 answeredWhat is a riskiest assumption?
It's the belief your idea depends on most that you're least sure about, the one that, if wrong, kills the whole thing. Risk score is impact times uncertainty, and the highest one is what to test first.
How do I find my riskiest assumption?
List the things your idea assumes are true, rate each on impact and how sure you really are, and the highest impact × uncertainty is the one to test before building. The worksheet above ranks them for you.
How do I test a risky assumption cheaply?
For most assumptions the fastest test is a handful of conversations with real potential customers, far cheaper than building on top of a guess and finding out you were wrong later.
The guide behind this tool
How to find your riskiest assumption
Find your startup's riskiest assumption: list everything that must be true, rank each by impact and uncertainty, then test the top one cheaply before you build.
Read the guideMore free tools
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- Startup Cost CalculatorOne-time setup, product, and months of operating: your real launch budget.
- Profit Margin CalculatorRevenue and costs in, your margin and markup out.