Stop Building Things Nobody Wants.
Daily startup ideas. Each one a full 15-section brief — who's in pain, what they're paying for, who's failing them, and exactly what you'd build to win.
50 briefs live today. A new one added every day.
One-time $99. Lifetime access. We're moving to a monthly subscription soon — lock it in before we do.
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, G2, and niche communities every day — so you don't have to
A new validated opportunity added every day. 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.
What you can do with it
It's not just a database of briefs.
See exactly where incumbents are dropping the ball.
We deep-dive G2 reviews for every niche — not the 5-star fluff, the 1- and 2-star pain. You'll see specific, recurring complaints that real users are writing right now. These are the gaps nobody's filling.
Know what's shifting before everyone else does.
Every niche gets a "what's changing" section — regulatory shifts, funding surges, tech transitions, market consolidation. The kind of context that turns a decent idea into a perfectly-timed one.
Shortlist the ones that actually interest you.
Reading briefs is step one. Saving the ones that match your skills, your interests, and your risk appetite is step two. Build your shortlist and come back to them without scrolling through everything again.
Compare ideas side by side. Kill your darlings faster.
Put two or three shortlisted ideas next to each other — TAM, competition density, WTP signals, build complexity. Sometimes the best way to pick an idea is to see it lose to a better one.
Generate a PRD when you're ready to build.
Found your idea? One click gives you a product requirements doc scoped to an MVP — core features, out-of-scope items, technical considerations, and success metrics. Not a 40-page enterprise spec. A founder-sized PRD you can hand to a developer or start building yourself.
Generate a validation questionnaire before you write a line of code.
The brief gives you signal. The questionnaire lets you confirm it. Get a ready-to-use set of interview questions tailored to the specific pain points, user segments, and willingness-to-pay assumptions in the brief. Share it as a link, collect responses, and review them all inside the app. Talk to 5 people before you build for 5,000.
Pricing
One price. Lifetime access.
We just launched. Founding members get lifetime access for a one-time $99 — before we switch to a monthly subscription. Get in now and never pay again.
Lifetime access — before we switch to monthly
Access to the full brief library. A new brief every day. Search and filter by category, difficulty, TAM, and more.
Founding members lock in $99 lifetime. BuildSignal is moving to a monthly subscription soon. This is the only time you'll see this price — lock it in before we make the switch.
Secure checkout via Stripe. Instant access.
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 day.
Who this is for
Founders who've shipped before
and want their next scouted opportunity.
This is for you if
Not for
Lock in lifetime — before we switch to monthly.
BuildSignal is moving to a monthly subscription soon. Get lifetime access to the full brief library for a one-time $99 while you still can. A new brief added every day.
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