World A / The story holdsWhat must be true?
The customer has the problem. The behavior changes. The economics survive.
Capsize makes the optimistic story explicit enough to attack instead of treating excitement as evidence.
CapsizeCAD $39 / monthCancel any time
Break the idea
before it breaks the budget.
You think the idea could work. Capsize helps you find the thing that has to be true, then gives you a cheaper way to find out before you build more.
Free: find the riskiest assumption first →Before you spend more
Find the assumption that could sink the whole thing.
- Tell Capsize what you are thinking of building.
- See the strongest reason it might work and the boring reason you might be fooling yourself.
- Find the assumption carrying the most risk.
- Leave with one real-world test and a clear reason to continue, change direction or stop.
One click opens secure Stripe checkout. No account or email gate before payment.
Already bought it? Sign in →How Capsize thinks
The paid workspace runs 4,000 deterministic simulations. That is synthetic pressure-testing, not proof that real customers want the idea.
Run the idea in
two worlds.
World B / The idea is wrongWhat else explains it?
The same early signal exists, but the load-bearing assumption fails.
The boring alternative matters because compliments, clicks and interest can exist without durable demand.
01 / Simulate
4,000 deterministic trials
02 / Find
The load-bearing stage
03 / Leave with
One real-world probe
The simulation is a structured reasoning aid. Actual validation starts when you run the recommended probe in the real world and bring the evidence back.
What you leave with
Not a score.
A better next move.
/01
What has to be true
Turn the idea into something specific enough to prove wrong.
/02
How you could be fooling yourself
Compare the exciting story with a plausible explanation that does not require the idea to be right.
/03
What to test first
Find the weakest link instead of trying to validate everything at once.
/04
What would change your mind
Run one concrete test, bring the evidence back and decide whether the idea earned more money.