Validate. Build.
Name. Ship.
CoFounderX is your AI co-founder. It assembles the right domain experts for your specific idea, stress-tests every assumption, generates your PRD, calculates build costs, and helps you find the right name — before you waste time building the wrong thing.
PRD ready for Cursor · Lovable · Replit · Ralphy · Bolt · v0
Five tools. One project.
Use one, use all five — in any order, any time. No locked steps, no forced sequences.
Chat
Talk to your AI co-founder. 2-3 sharp questions to sharpen your idea before any analysis runs.
Validate
AI assembles the right expert panel for your idea. Each expert challenges your assumptions in a live discussion. Ends with a devil's advocate before verdict is locked.
Costs
AI tools vs hiring a team — exact comparison, 6-month marketing budget, monthly burn, build timeline.
PRD
Production-ready spec formatted for your chosen build tool. Enriched with validation findings. Download as .md.
Namegen
Generate names by strategy and feeling. Check domains (.com .app .ai .io .co) and social handles instantly.
The verdict.
Three outcomes. No ambiguity. Every validation ends with a clear signal you can act on.
Proceed
Strong market signals, viable unit economics, no fatal assumptions. You have a clear path to v1. Your PRD and cost estimate are ready.
Pivot
The core has merit but current form won't work. Three specific pivot directions provided with reasoning from the expert panel.
Kill
A fatal assumption survived every expert challenge. We killed it before it killed 12 months of your life and your runway.
How validation works
Describe your idea
Chat with your AI co-founder. 2-3 focused questions to sharpen it before any analysis runs. Direct, honest, no fluff.
AI proposes your expert panel
Based on your specific idea — not a fixed checklist. A fintech gets a regulatory specialist. A marketplace gets a network effects strategist. You approve and modify before running.
Experts analyse and challenge
Each expert runs their domain analysis, presents findings with real data, and opens a live discussion. You defend your assumptions. Scores update based on discussion quality.
Devil's advocate
One mandatory final challenge targeting the weakest surviving assumption — the thing you argued your way around but didn't actually resolve. Your answer locks the verdict.
Verdict + outputs
Proceed / Pivot / Kill with confidence level and specific reasoning. Three documents generated: founder letter, investor memo, pitch brief. Ready to share or act on immediately.
Built for Venture Studios
Validate every incoming idea before committing resources. Share validation reports with investment committees. Run an entire cohort through structured analysis in parallel. CoFounderX also runs as an embedded Idea Lab inside Venture Core OS.
- check_circleMulti-seat team management
- check_circleAdvisor review mode
- check_circleShareable validation reports
- check_circleVenture Core OS integration
"Reduced our pre-seed validation time from 3 weeks to 35 minutes."
— MD, Nexus Venture Studio
Precision pricing.
7-day free trial on all plans. No credit card required.
Starter
- done3 validations/month
- doneAI co-founder chat
- doneFounder & investor views
- done1 PRD per validation
- doneUnlimited name checks
Builder
- done15 validations/month
- doneEverything in Starter
- donePitch brief generation
- doneUnlimited PRDs
- doneShareable report links
Studio
- doneUnlimited validations
- doneEverything in Builder
- done5 team seats
- doneAdvisor review mode
- doneVenture Core OS integration
35 minutes. A verdict you can actually act on.
Start your first validation →7-day free trial · No credit card required