Stop buildingbad ideas.
Rational AI tells you when your startup idea is flawed — backed by data, not hype. Get a viability score, blunt feedback, and a step-by-step validation plan in under a minute.
Try it right now
Sign up free, then a one-time $14 unlocks unlimited verdicts for good.
Here's what you'll get back
Promising wedge, but the monetization math doesn't hold up yet.
Strengths
- Underlying pain point is validated by real, recurring complaints.
- Distribution channel (existing community) lowers CAC risk.
Critical flaws
- No clear wedge against incumbents already serving this audience.
- Monetization model assumes a conversion rate 3x industry average.
- Target audience is too broad to build focused positioning.
Why founders use it
An honest second opinion,
not another yes-man
Market reality
Live competition research, not guesswork — see who else is already solving this before you write a line of code.
→ searching "AI idea validator"...
found: Validator.ai — $29/mo
found: IdeaBuddy — $19/mo
found: 3 more competitors
Brutal honesty
No sugarcoating. We surface the flaws you're missing.
Actionable next steps
A validation plan, not just a score you can't act on.
How it works
From idea to verdict in three steps
Tell us what you're building
A paragraph on the idea, who it's for, and how it makes money. That's it — no forms, no decks required.
Pricing
One payment. No subscription.
Rational AI — Lifetime access
Judge unlimited startup ideas, forever
- Unlimited idea evaluations, forever
- Live competitor research on every submission
- Full scoring breakdown: demand, differentiation, monetization, execution risk
- Every verdict saved to your account
- No recurring charges, no subscription to cancel
Access forever (no subscription)
What founders say
What founders are saying
“Told me my monetization math was wrong before I'd spent a dollar on it. Saved me a quarter, easily.”
Jordan M.
Solo founder
“Finally an AI that pushes back. Every other tool I tried just cheered along with whatever I typed.”
Priya K.
Product manager
“The competitor research alone is worth it — found three products doing exactly what I planned to build.”
Diego R.
Indie hacker
FAQ
Questions, answered
Sign up for free, then a one-time $14 payment unlocks unlimited verdicts for good — no subscription, no recurring charges.
Get a verdict on your idea in 60 seconds
Sign up free, describe your idea, pay $14 once to get judged.
Evaluate your idea