Validate ideas with real users
before you build.
80% of founders waste months building what no one wants. We turn your idea into real-world market experiments in hours. Get actual demand signals before writing code.
See validation in action
Enter any startup idea and watch how FirstUsers.ai designs experiments, simulates traffic, and generates real demand signals.
Building before validating is a $100k mistake
Most founders follow the traditional path because they don't know there's an alternative. There is.
Traditional Path
Assume you know what users want
Build features in isolation
Hope users magically appear
Wonder where everyone went
FirstUsers Path
Describe your idea in plain English
Automated validation campaigns
Behavioral signals, not surveys
Build only what's validated
Validation-as-a-Service
Outsource the messy work of market testing
Infrastructure for Clarity
The tools to know before you build
Behavior over Opinion
What users do, not what they say
Stop Building, Start Validating
The fastest path to product-market fit
Built by founders who hate wasting time
We've built products that failed because we didn't validate. We're building the tool we wish we had.
TUM & LMU
Munich's top technical & business schools
BCG Alumni
Strategy consulting background
2x Serial Founders
Built products that scaled
350k+ Users
Scaled multiple products
"We spent 6 months building a product nobody wanted. That failure cost us $150k and almost killed the company. FirstUsers is the validation engine we built to make sure that never happens again—to us, or to you."
Questions founders ask
Everything you need to know about validation-as-a-service.
Stop building. Start validating.
Join 600+ founders in our exclusive beta. New validation batches launch every 48 hours. Get early access and founder pricing.