Test your startup idea
with 8 AI investors
in 3 minutes
FounderJury.ai checks your startup idea. Write it in a few sentences, and 8 AI assistants — from Anthropic, OpenAI, Google DeepMind, xAI, DeepSeek, Meta, Moonshot, and Alibaba — each read it and tell you what they think. They ask the same kinds of questions a real investor would. In under 3 minutes you get a clear written answer: what's strong, what's risky, and three things to do next. The free version needs no sign-up and no credit card.
Plain answers, no startup-jargon. No sign-up, no credit card. Ready before your coffee gets cold.
Why not just ask a single AI?
A single AI tells you what you want to hear. 8 models with different training argue — and that’s the point.
This is what a real debate looks like
A founder submitted “AgentWitness.ai” — an AI compliance audit tool. The Jury scored it 62/100 — Pivot.
Repositioning play with real regulatory blind spots.
Good margins, weak distribution, fragile willingness-to-pay.
Category-invention fantasy built on shaky assumptions.
Market positioning is flawed: €497 to VCs screams low quality.
LangSmith (by LangChain) already does partial agent tracing — one feature update kills this.
Approach 20 micro-VCs with a free sample. If fewer than 5 say it changed their decision, the value prop fails.
Free · 2 debates included · No signup required
Three steps to an honest answer
Tell us your idea
Write your idea in 2-3 sentences. Or paste a YouTube link — Gemini watches the video for you.
8 AI models look at it
Claude, GPT-5.5, Grok, Gemini, DeepSeek, Llama, Kimi and Qwen all read your idea at the same time.
Get your answer
A clear written answer with a score, what's risky, what's promising, who else is doing something similar, and your first 3 concrete steps.
From idea to domain purchase in one afternoon
How a founder used FounderJury to transform an AGI oversight idea into a validated business model — and knew exactly when NOT to build.
FounderJury.ai is a “Pre-Seed VC in a Box.” It provides the kind of brutal, data-driven feedback you usually only get after a failed pitch to a top-tier venture capital firm.
Kills Happy Talk
Scores of 48/100 and 5/10 prove the tool is designed to find reasons NOT to build.
The Judge Catches Hallucinations
When models cited “Timelex partnerships,” the Judge said: “You have produced zero first-hand evidence.”
Finds the Boring Path to Money
Took a sexy idea (“Sentinel for AGI”) and forced it into a boring revenue model (Technical Evidence Prep for EU Law Firms).
Timing-Budget Mismatch Alert
Enterprise sales take 18 months, solo bootstrappers have 6 months of runway. Solution: white-label through law firms.
I Built This Tool.
Then My Own Tool Failed Me.
I used FounderJury to validate a sleep app idea. 8 AI models debated brilliantly — pricing strategy, technical risk, go-to-market, liability concerns. The analysis was genuinely impressive.
I bought 6 domains (€120). Secured 8 social handles. Built a landing page. Designed the product. Wrote a 773-line build guide. 14 hours of work.
Then I asked one Claude conversation a different question: “Who is already doing this?”
One model. One question. 30 seconds. Found what 8 models debating for 8 minutes missed.
The 8 models didn’t fail me. The question I asked them failed me.
I asked: “Is this a good idea?”
I should have asked: “Who is already doing this and why would I lose?”
“FounderJury was a courtroom without a detective. The jury argued brilliantly, but nobody investigated the evidence first.”
Market Researcher, Prosecutor, Customer Simulator, Graveyard Digger — each model investigates a different angle instead of all answering the same question.
The Prosecutor’s job is to KILL your idea with facts. A BUILD that survives prosecution is trustworthy. A BUILD from a polite prompt is not.
Before any debate, list the competitors you know. The 8 models then focus on finding what you missed.
When the panel says 'Pivot' or 'Skip', one click gives you 3 reworked versions that address the specific weaknesses they pointed out.
Same idea. Same platform. Same 8 models.
The new specialized roles found all 5 competitors, the iOS technical blocker, and the kill shot — things the old generic prompts never surfaced.
That sleep app wasn’t an isolated mistake. I asked AI to help me build startups. It said YES to everything. I bought 20 domains, built 14 projects, launched 2. Revenue: zero.
That’s why we built FounderJury — so your accelerator’s selection committee doesn’t waste 200 hours screening applications that an 8-model AI jury can evaluate in 1 hour.
Or try it yourself — free
Used by accelerators, micro-VCs, and university programs
Simple. Honest. No surprises.
- ✓20 evaluations / month
- ✓All 8 AI models
- ✓YouTube video analysis
- ✓Team Battle template
- ✓Trend Scout template
- ✓Iterative progress tracker
- ✓Priority queue
- ✓Data-enriched scoring
- ✓Everything in Pro
- ✓5 team members
- ✓Shared workspace
- ✓CSV/API export
- ✓White-label reports
Frequently asked questions
How do I validate my startup idea?
Write your idea in a paragraph — who is it for, what problem does it solve, what does it cost — and check it against the same kinds of questions a real investor would ask. FounderJury.ai uses 8 AI models that each give an independent answer on five points, and puts together a written summary: the biggest risks, the strongest argument against your idea, and three concrete things to do next.
What is the best AI tool to validate startup ideas?
Any single-AI tool has blind spots from what it was trained on. FounderJury.ai runs your idea through 8 AI models at the same time — from Anthropic, OpenAI, Google DeepMind, xAI, DeepSeek, Meta, Moonshot, and Alibaba — so when they disagree, that disagreement itself becomes a useful signal instead of being hidden by one model's preferences. The final answer is a careful summary of all 8, not a majority vote.
Is there a free AI startup idea validator?
Yes. FounderJury.ai has a free version — no credit card and no sign-up — that gives you a full 8-model check on your first idea. The paid version (€29 a month, or €249 a year for three months free) removes the monthly limit and adds saved history, a 90-day personal dashboard, and Website Improver.
What is an AI investor feedback tool?
An AI investor feedback tool gives you the same kind of judgment a real investor would: scores on different points, big problems pointed out, suggestions to change direction, and specific things to do next. FounderJury.ai goes further — 8 AI models each play the investor role with different backgrounds, then they discuss their answers with each other, so blind spots in any one of them get caught when the others push back.
How do I test a business idea before building?
Before you write any code, check your idea against the three reasons most startups fail: no one really wants it, you have no real edge over competitors, no clear way to make money. The 3-minute check from FounderJury.ai looks at all three at once and gives you a clear answer — go ahead, change direction, or don't build it — together with the strongest argument against your idea and three things to do first.
What is an AI co-founder simulator?
An idea where AI models act like tough co-founders — pushing back on your idea, asking hard questions, and pointing out problems before you start building. FounderJury.ai does this with an 8-model panel: each one looks at your idea on its own, then defends or challenges its answer in a structured back-and-forth with the other seven.
Ready for the truth?
Stop guessing. Let 8 AI investors take a look.