Get startedSimulate before you build
Understand how your
idea resonates before
it reaches the market.
Delfy creates simulations with synthetic personas
to reveal objections, adoption triggers, and signals
of traction with visual clarity.
StripeSupabaseFly.ioOpenAI
From startup thesis to market signal.
Pré-launch
delfy
Avoid building
the wrong thing
before launch.
100 AI personas
evaluating your
startup idea.
Simulate customers, investors,
competitors and more
then see what they evaluate:
One-liner
Landing
Pitch
PRD
Pricing
Personas
86
signal score
clarity
trust
wtp
+30 advanced metrics
to analyze your idea.
Scores for clarity, relevance, differentiation, trust, and willingness to pay, plus objections, triggers, clusters, and recommendations.
We reran the
Airbnb 2008 pitch
Investors passed for 4 recurring reasons: trust, cancellation clarity, regulation, and competition.
Dashboard
Your command center. Every project, simulation, and insight — all in one place.

Five perspectives.
One simulation.
Each society brings together 100 personas with distinct profiles, motivations, and evaluation criteria. Choose who matters for this round.
CustomersCompleted
Simulation Results
Read our notes before your next big moment.
Focused notes for founders who want sharper feedback before investor meetings, launches, and critical decisions.

Get Pitch Deck Feedback Before Your Next Investor Meeting
The 5 narrative failure modes that kill pitch decks, a 30-minute cold-read audit, and a framework for getting structured feedback before your investor meeting.
8 min read
Read More

Test Your Landing Page Messaging Before Launch
The 5 above-the-fold messaging mistakes that kill conversion, a 20-minute cold-traffic audit, and a framework for testing your landing page with simulated visitors before launch day.
8 min read
Read More

Validate Your PRD Before Committing Engineering Time
The 5 failure modes that turn PRDs into wasted sprints, a 25-minute pre-sprint clarity audit, and a framework for testing requirements with simulated builders before committing resources.
8 min read
Read More