An AI idea validation tool that interviews you before real users do
You have an idea. The people around you say it’s great.
That is exactly the problem: people who like you will not tell you what is wrong with it.
PreMortem runs a mock user interview before you spend a real person’s time. Describe your idea, select a persona, and answer the questions a real user would ask. The follow-up questions are where weak ideas fail — better here than in a real interview.
What you get
Personas that push back
Select a skeptical CFO or a busy parent. Each persona has its own goals, budget, and objections. Flattery is off by default.
Follow-up questions, not a score
Other validators return a score out of 100 and present it as insight. A score tells you where you stand; an interview shows you why. This tool runs the interview.
A transcript you can act on
You receive the full Q&A with weak answers flagged, plus the question a real user would have asked next. Address those, then schedule real interviews.
No login, no card
Paste your idea and start. Early access is free.
How it works
- Describe your idea — two or three sentences are enough.
- Select a persona — your target user, or the most skeptical stakeholder. The interview adapts to your answers.
- Read the transcript — weak answers are flagged with the reason. This is your preparation list for the real interview.
A note on honesty
An AI persona is not a real user. It cannot tell you whether anyone wants your product — only people can do that.
What it can do: surface the answers you do not have yet, the claims you cannot support, and the questions you are not prepared for. Use it to walk into real interviews prepared. That is the entire purpose of this tool.
Frequently asked questions
What are the best idea validation platforms?
It depends on your stage. Score-and-report validators (IdeaProof, ValidatorAI, DimeADozen) provide a quick viability read. PreMortem covers the step after that — rehearsing how you present and defend the idea. Many founders use both: a score to sanity-check, a rehearsal to prepare.
Does this replace talking to real users?
No. AI personas cannot replace customer interviews — real signal comes from real people. This tool is preparation for those conversations: it takes minutes instead of days, and it helps you avoid spending limited interview time on questions you could already answer yourself.
How is this different from an AI validator that gives a score?
A score tells you where you stand; an interview shows you why. In a mock interview you must state your pricing directly, defend your assumptions, and answer questions such as "why wouldn't I just use a spreadsheet?" — questions that score-based tools never ask.
How do I validate a startup idea before building?
The standard playbook: write down your riskiest assumption, talk to people who have the problem (see The Mom Test), and observe what they do rather than what they say. Running a mock interview first surfaces the gaps in your story, so each real conversation yields more.
Do I need an account?
No. No account, no credit card. Paste your idea and start.