Outcomes
Ideas don't fail quietly here
Thousands of founders have put an idea through LEANSpark and found out what was wrong with it before they built it. This is what they have done so far.
As of 20 September 2026
- 5,102 founders at work have used it, not just signed up
- 6,155 ideas in play distinct startups, variants not double-counted
- 6,888 stress tests completed run against the seven dimensions of the model
- 1,889 customer interviews logged real conversations, practice runs excluded
60% of stress tests fail.
Most AI tells you your idea is brilliant. LEANSpark tells most founders their idea does not hold up yet, and shows them exactly which part broke. That is the whole product. An assistant that agrees with you is worth nothing.
Where ideas break
Ideas are tested across seven dimensions. Clarity comes first, and it is the one most founders discover they never had.
We count these the hard way
- A founder counts when they have actually used LEANSpark, not when they sign up.
- Three variants of one idea is one startup, not three.
- A stress test counts once per run on an idea — some runs cover one dimension, some all seven.
- Practice interviews do not count. Real customers do.
Every number here comes from the live product. We would rather publish a smaller number we can stand behind than a bigger one that needs a footnote.
Find out what's wrong with your idea
Free to start. The first stress test takes about ten minutes. It might not go well, and that is the point.
Start free