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 11 October 2026
- 5,784 founders at work
- 6,921 ideas in play
- 8,148 stress tests completed
- 2,102 customer interviews logged
- 135+ countries founders work from
- 32+ languages founders work in
58% 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.
- Countries and languages are floors. Country has only been recorded since January 2026, and a founder whose language we cannot tell is left out, so the true number is higher.
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