We found the pain. We validated the market. You pick what to build.
Deep opportunity briefs for founders who've built before. 15 sections of real validation — Reddit quotes, willingness-to-pay signals, competitive gaps, build estimates, and an honest GO / NO GO verdict. Without spending 40 hours on Reddit and Crunchbase.
50 briefs at launch. New ones added every week.
Join 33 founders on the waitlist. No payment required.
See a real opportunity brief — in 60 seconds
“I spent 3 weeks validating an idea last year. This brief had more signal in 15 sections than everything I gathered on my own.”
— David Phillips, Founder
What you get
What's inside each brief
We scan Reddit, funding rounds, Hacker News, and niche communities every day — so you don't have to
New validated opportunities added every week. Each one: real user pain, real quotes, real WTP signals, and our honest GO/NO GO.
Every quote sourced. Every data point cited. Every URL verified.
Every brief ends with a verdict: BUILD or SKIP. We don't hedge.
The ChatGPT Test — if AI can solve it, it's not a business.
Pricing
One price. Lifetime access.
Prices will move to subscription after launch. No payment required now — you pay only when we go live.
Lifetime access — before we switch to monthly
Access to the full brief library. New briefs every week. Search and filter by category, difficulty, TAM, and more.
Waitlist members get lifetime access at $99. After launch, BuildSignal moves to a monthly subscription. No payment required now — you pay only when we go live.
Why this exists
Built by Mohan. Six products. Five dead. One hit.
ProxiesAPI wasn't the best idea I had — it was the best researched one. Before I wrote a line of code, I spent weeks buried in Reddit threads, analyzing what developers were actually complaining about, cross-referencing who was paying for garbage alternatives, and mapping out where the incumbents had stopped caring.
By the time I started building, I already knew it would work. It's been profitable since month three. No VC. No cofounder. Still running.
The other five? I skipped the research. Built on vibes. You know how that ends.
BuildSignal is the exact process that found ProxiesAPI — the scouting, the validation, the GO/NO GO call — just done for you, every week.
Who this is for
Founders who've shipped before
and want their next scouted opportunity.
This is for you if
Not for
Join the waitlist. Lock in lifetime access.
Limited early access spots. No payment required. We'll email you when we launch — your $99 lifetime rate is locked in the moment you sign up.