You don't need more startup advice. You need a next move.
Day Zero helps early-stage founders figure out what matters most, gather evidence, and decide what deserves Day One.
7-day free trial · $24.99/month after · Cancel anytime
You have an idea. Now what?
Every direction pulls at once, and none of them comes with a guarantee.
Day Zero helps identify what would reduce the most important uncertainty now — so your next hour of work is the one that teaches you the most.
How Day Zero works
Start with your idea
Start wherever you are — problem, solution, customer, technology, or something vague.
Get your Next Move
Day Zero helps identify what is most worth learning next.
Bring back what happened
Log conversations, experiments, evidence, and decisions. Day Zero helps you interpret what changed.
ChatGPT can give you ideas.
Day Zero remembers what you believed, what you tested, what you learned, and what changed.
That means your next move is based on your venture's evidence — not generic startup advice.
What you get
One clear Next Move
Every session ends with the single most valuable thing to learn next.
Conversation prep + capture
Know who to talk to and what to ask, then log what happened.
Assumptions worth testing
Your riskiest beliefs, ranked by what would hurt most if wrong.
Experiments
Design small tests with success criteria before you run them.
Solution evolution
Watch your solution change as the evidence changes it.
Evidence Library
Sources, interpretations, insights, decisions — a trail you can audit.
AI mentor coaching
Critique that challenges your claims and supports the work.
Founding-team collaboration
Co-founders work in the same venture with their own login.
Day Zero Founder
7-day free trial$24.99/month
- One active venture
- Founding team included
- Evidence Library
- AI mentor coaching
- Cancel anytime
Cancel anytime. Your ventures and evidence are preserved if you leave.
Day Zero works wherever you build — desktop or mobile.
Founder first. AI second. Evidence always.
Simple enough to use. Rigorous enough to trust.
Changing your mind because the evidence changed is progress.