Prüf by OddHours
Prüf dashboard
The AI cofounder for first-time founders

Prove your idea

Most startups don't fail from bad code. They fail from bad assumptions.

Start freeHow it works

The problem

Most founders build first.
Then find out nobody cares.

42%

of startups fail because nobody wanted what they built

CB Insights, 2023

90%

of startups fail. Most within the first two years.

Startup Genome Report

$0

of revenue validated before most founders write their first line of code

The uncomfortable truth

How it works

From idea to evidence
in one session.

01

Describe your idea

In plain English. No decks, no frameworks. Prüf researches the market and asks what it couldn't find online.

02

Get your gap map

Eight dimensions. Each scored. Each explained. You'll know exactly where you're strong and where you're blind.

03

Work your evidence tasks

Concrete actions — customer interviews, pricing tests, competitor teardowns — each with clear done-when criteria.

Meet Rigor — inside Prüf

Your AI cofounder.
Not a yes-machine.

Prüf gives you a gap map, evidence tasks, and an AI cofounder named Rigor — a trained analyst that probes your idea the way a sharp investor would, without the ego, the gatekeeping, or the calendar invite.

Asks what you haven't thought of

Surfaces blind spots from 8 validated dimensions of startup risk.

Researches before it asks

Pulls market data, competitor signals, and demand proxies before your first message.

Reviews your evidence honestly

Scores what you submit against the actual criteria. No participation trophies.

Rigor — AI cofounder inside Prüf
R
Rigor

Who is the specific person that loses sleep over this problem right now?

Small business owners who struggle with bookkeeping.

QuickBooks has 7M paying customers in that exact segment. What do you offer that makes them switch — and absorb the switching cost?

We're simpler and more affordable.

"Simpler" is a feature claim, not a moat. Have you spoken to 10 QBO users who actively want to leave? What did they say?

Reply to Rigor…

Everything you need

Built for the work
that happens before the build.

◈

Gap Map

8 dimensions of startup risk scored and ranked. Know your blind spots before investors do.

◎

AI Interview

Rigor, your AI cofounder, asks the hard questions. Surfaces assumptions you didn't know you were making.

▦

Evidence Tasks

Not generic advice — specific tasks with done-when criteria tied to your exact idea.

◇

Evidence Vault

Submit what you found. Prüf reviews it against the criteria and updates your score.

⬡

Competitor Radar

Automated research on who already owns your space and how differentiated you actually are.

◉

Founder-Market Fit

Honest assessment of whether you're the right person to solve this problem, right now.

“The riskiest thing a founder can do is skip validation. Every week of building on a bad assumption costs you a month of recovery.”

Y

YC Partner

Y Combinator

“Cursor writes code. Prüf tells you if you should.”

Pricing

Start free.
Go deeper when you're ready.

Beta

$0while in beta
  • 1 idea analysis
  • Full gap map
  • Up to 5 evidence tasks
  • AI interview (3 sessions)
  • Community support
Start free
COMING SOON

Premium

TBD
  • Unlimited ideas
  • Full gap map + scoring
  • Unlimited evidence tasks
  • Unlimited AI interviews
  • Evidence vault with file uploads
  • Competitor analysis
  • Priority support
Coming soon

Free to start · No credit card

Your idea has blind spots.
Find them in 5 minutes.

Prüf gives you an honest read on your idea before you spend a dollar building it.

Validate your idea — free