17,474 real SaaS companies tracked· 413K ads · six decision signals · evidence first

Know if your idea is worth building before you build it.

Type a market or idea. SignalBuild turns competitor records, ad activity, revenue proof, tech stack, and positioning clues into six decision signals, then tells you in plain English: build, test, watch, or avoid.

↓ Live example below — real market evidence, not a mockup
Live market data/opportunity 1 of 3 · 5 evidence layers active
Market opportunity

ADHD focus tools for remote workers

Worth Testing5/5

How to enterWin on ADHD-specific language — incumbents all use generic "productivity" messaging. You out-position them without out-building them.

Market Proof
84/100
Market Open
70/100
Build
4/10
Evidence layers · click any to expandrefreshed weekly
Live ad creatives from Meta + TikTok ad libraries
AdvertiserHook copy (live)Spend
Brain.fmMusic engineered for ADHD focus$24k / 30d
MagicmindProductivity shot for distracted minds$41k / 30d
TiimoVisual planner that thinks like you do$11k / 30d
+ 409 more in the Decision Trail
Reading 412 live ad creatives from Meta's public Ad Library…analysis complete · signals assembled
Contractor quoting tools — 22 companies actively advertising, spend up 18% this month ADHD productivity — 4 new ad angles repeating on TikTok right now Solo therapist tools — 14 companies total, only 3 are HIPAA-compliant Wedding planner CRM — 3 of the top 5 players dropped prices last month Legal AI for solo practitioners — 3 brand new entrants in the last 30 days Postpartum fitness — creator content rising sharply, no dominant app yet Student screen-time — 2 of the top 5 advertisers went completely quiet this week AI invoicing — user churn rising, most customers not sticking past 60 days Contractor quoting tools — 22 companies actively advertising, spend up 18% this month ADHD productivity — 4 new ad angles repeating on TikTok right now Solo therapist tools — 14 companies total, only 3 are HIPAA-compliant Wedding planner CRM — 3 of the top 5 players dropped prices last month Legal AI for solo practitioners — 3 brand new entrants in the last 30 days Postpartum fitness — creator content rising sharply, no dominant app yet Student screen-time — 2 of the top 5 advertisers went completely quiet this week AI invoicing — user churn rising, most customers not sticking past 60 days
§01The real cost of a bad idea

Most SaaS founders make their biggest decision — what to build — based on gut feel.

Not anymore. SignalBuild reads 17,474 real SaaS companies, their actual ad spend, their pricing, their customers, and their stack — then turns that evidence into a verdict you can act on.

01
"I think there’s demand for this."
↓ replaced by
02
"I’ve looked at the competition. They all suck."
↓ replaced by
03
"I’ll just ship something quick and see."
↓ replaced by
§02How it works

From idea to go/no-go decision in minutes.

Four steps. SignalBuild does the research across real market evidence - you make the call. Every signal has a source. Every recommendation links back to a real company or a real dollar.

STEP 01/04

Describe your idea

A niche, an audience, a problem to solve. As rough or specific as you like. "Invoicing tool for freelancers." "App for ADHD parents." We take it from there.

STEP 02/04

We read real competitor signals

Live ad spend, competitor pricing, App Store rankings, creator activity, and tech stacks — all read simultaneously the moment you submit.

Meta AdsPricingApp StoreCreatorsTech StackANALYSIS
STEP 03/04

You get six decision signals

Demand, market room, revenue proof, ad activity, build effort, and defensibility - each calculated from real evidence and rolled into a plain-English verdict.

STEP 04/04

Get a Build Brief

A one-page action plan: what to build first, what to skip entirely, how to price it, and how to find your first customers — based on what's actually working in that market today.

§03Opportunity feed

We track real markets. Every card below is live data.

Each opportunity is a market we're monitoring right now using real ad spend, real competitor counts, and real pricing data. The simplified card shows three of the six decision signals:

Demand
How much real money is being spent on ads in this market right now. High = proven demand.
Room
How crowded it already is. High = real space for a new player to win.
Effort
How hard it would be to build something competitive, based on what existing products have actually built.

ADHD focus tools for remote workers

Worth Testing

38 real companies are spending money on ads in this market right now. But not one of them speaks directly to adults with ADHD — they all use generic "productivity" language and miss the actual pain.

0
Demand
0
Room
4/10
Effort
VerdictThe gap is messaging, not product. A tool built for ADHD will convert better on the same channels the incumbents are already paying for.

Quoting tool for residential trades

Build Now

The top 3 products here charge $65+/month and are designed for large service companies — not the solo plumber, painter, or electrician who just needs to send a quote in under 5 minutes.

0
Demand
0
Room
4/10
Effort
VerdictTrades businesses pay fast for tools that save time. Distribution is straightforward — YouTube tutorials and Facebook contractor groups already have your customers.

AI notes for solo therapists

Worth Testing

14 companies compete in this niche, but only 3 are properly HIPAA-compliant. Therapists desperately want this tool but don't trust most of what exists. The barrier is compliance, not demand.

0
Demand
0
Room
6/10
Effort
VerdictCompliance is the moat here, not the AI quality. Solve HIPAA properly and the effective competition gets very thin, very fast.
§04The evidence layer

Every score traces back to a real company, a real ad, or a real dollar spent.

We don't invent scores from a prompt. We pull from public ad libraries, competitor records, pricing, product pages, traffic, tech stacks, and market metadata — then calculate. Every number has a source.

0
real SaaS companies
in our database
0k
actual ad creatives
from Meta's Ad Library
0
competitor tech stacks
profiled and verified
0 wk
of ad spend history
tracked per market
weekly
data refresh — because
markets change fast
§05Build Brief

Pro turns market evidence into a Build Brief.

A Build Brief is a one-page founder action plan, not a strategy deck. It tells you what to build first, what to skip, how to price it, and how to find your first customers. Every recommendation is grounded in the evidence behind the six signals.

Sample brief — ADHD focus tools

What you get with every Build Brief

Backed by real evidence · ready in seconds · exportable on Pro

  • Go / no-go verdict with full reasoning
  • What to build — and the thinking behind it
  • Who your first customer is and where to find them
  • How to position against what already exists
  • What to build first — and what to cut entirely
  • Ad angles and messaging that's working in this market today
  • Pricing recommendation based on real competitor data
  • How to get your first 100 customers
  • A 30-day validation checklist
  • Risk flags — what could go wrong and what to watch
Build Brief / 001SignalBuild · May 31

ADHD Focus Tools for Remote Workers

Verdict Worth Testing
All sources verified
§06Pricing

Validate free. Pay when you find an idea worth building.

Free gives you the verdict and high-level signals. Builder unlocks the evidence behind every signal. Pro adds Build Briefs and exports when you are ready to move.

Free
$0 / forever
Get a real verdict before committing a single hour to building.
  • 5 idea searches per day
  • Go/no-go verdict for every idea
  • Six high-level decision signals
  • 3 saved ideas
Start free
Pro
$79 / mo
For founders running multiple ideas or watching several markets at once.
  • Everything in Builder
  • Build Briefs
  • CSV export
  • Deeper competitor evidence
  • Unlimited saved ideas
Upgrade to Pro
Agency
$199 / mo
For teams doing market validation on behalf of clients.
  • 5 team seats
  • White-label reports for client delivery
  • API access for custom integrations
  • Priority analysis queue
Contact sales

Your next SaaS idea should be a decision,
not a guess.

SignalBuild reads 17,474 real companies — their ad spend, pricing, customers, and tech — then turns that evidence into six decision signals and a clear build verdict.