A month ago I got obsessed with one question.
Why do smart people make terrible decisions sometimes?
So I spent a month reading peer reviewed research instead of doing normal 14 year old things.
Kahneman proved stress collapses careful analytical thinking entirely. Baumeister proved every decision you make depletes a finite cognitive resource. Walker proved sleep deprivation destroys judgment before you consciously feel it. Monk proved your brain has specific peak performance windows based on when you woke up. Lieberman proved one cup of coffee helps but two hurts. Ratey proved exercise directly boosts the exact brain region responsible for complex decisions.
Six factors. All peer reviewed. All measurable.
So I built something.

I used Bolt and Claude to build a web app called BlackBox. It asks you six questions. Calculates a weighted cognitive score based on the actual research. Tells you whether right now is a good time to make an important decision.
I have zero coding background. I used AI tools to build what would have taken a developer weeks.
I launched it publicly with zero budget.
Day one: 44 users across the United States and India. Zero marketing. Just three Quora answers pointing to it.
The app is live at getblackbox.netlify.app

Here's what surprised me:
People don't just use it once. They come back.
Because the score changes every day. Sometimes dramatically.
Your cognitive state on Monday morning after 8 hours sleep is completely different from Sunday night after a stressful week.
That difference is the entire product.

What I'm building next:
The web app is version one. It asks questions.
Version two connects to Apple Health and reads your HRV and sleep data passively. No manual input. The app knows your cognitive state before you open it.
That version requires a native iOS app with HealthKit integration.
Which is why I'm looking for a technical cofounder.

What I learned building this at 14:
You don't need to know how to code to build something real.
You need to know what problem you're solving and be stubborn enough to figure out the rest.
AI tools have made it possible for anyone to build a working product.
The barrier isn't technical anymore.
The barrier is seeing the problem clearly enough.

If you're a developer who has worked with biometric data or HealthKit and this idea obsesses you the way it obsesses me — find me.
And if you want to check your cognitive state before your next important decision:
getblackbox.netlify.app
What's your score?