Real story — May 12, 2026
Cal.com booked the meeting. The client was fake.
Briefqualify qualifies every inbound booking — phone, email, link, domain — before you prep, before you press join. Real clients through. Tire-kickers and phantoms out.
50 checks/month · No card · Account created on first sign-in
Fictional NANP range (555-0100–555-0199)
Generic alias, no social presence
Vercel DEPLOYMENT_DISABLED — HTTP 451 for ToS violation
Domain age: 0 days, registered as throwaway
What actually happened.
On May 12, 2026, my Cal.com sent me a polite confirmation: 30-minute SaaS-MVP discovery call. Real-looking name. Real-looking brief. Real-looking budget question. I almost spent the night prepping for it.
The signals were all there for anyone who looked. The phone number +1 628 555 0147 sits inside the North American Numbering Plan's reserved range for fictional use — 555-0100 through 555-0199. The brief link returned HTTP 451 with DEPLOYMENT_DISABLED — Vercel had killed it for ToS violation. The domain was zero days old.
Six failing signals. Each takes seconds to check if you know what to look for. The tooling for every one of them already exists — libphonenumber, urlscan, VirusTotal, WHOIS. Nobody strings them together at the moment you need it most: the half-hour between a booking confirmation and the call.
Briefqualify is that string-together. It also works the other way — when a booking checks out clean, you walk into the call with confidence instead of doubt.
Who it's for.
Freelancers
Your calendar is public. That means anyone can book you — real clients and phantom ones. Stop prepping for calls that were never real.
Consultants
High-value retainers start with a first call. Know before it happens whether the inbound is a serious buyer or a time drain.
Agencies
Every new-business enquiry that comes through the booking link gets scored before your team touches it. Bad leads out, good ones in.
How it works.
- 01
Forward
On signup you get a unique address. Set a one-line Gmail filter to auto-forward your booking confirmations there. Works with Cal.com, Calendly, and every booking tool that sends email.
- 02
We score
Phone format + fictional-range detection, email OSINT, link reputation via urlscan + VirusTotal, domain age + DNS posture. Same chain Daniel ran by hand on May 12 — automated in parallel.
- 03
You decide
A green / yellow / red verdict lands in your inbox in under 30 seconds with every signal laid out. Green: take it. Yellow: look closer. Red: archive and move on.
What we actually verify.
Four signal categories. Each one is a real API or public dataset — not AI guessing.
Phone
Format validation, fictional NANP ranges (555-01XX), VoIP carriers, country mismatch with claimed timezone.
Domain age, breach history, social-account linkage, disposable-provider detection, name-pattern analysis.
Links
urlscan + VirusTotal lookups, deployment-status checks (we caught a Vercel-disabled phishing host on day one), redirect chain analysis.
Domain
WHOIS age, registrar reputation, DNS records, SSL certificate history, parked-vs-active status.
Free to start. Serious when you are.
Beta is free. No card, no limit on features — just a generous monthly check quota so you can build the habit before we ask you for anything.
50 checks / month
- ✓50 checks / month
- ✓Phone, email, link, domain signals
- ✓Verdict email notifications
- ✓Email forwarding inbound
- ✓Check history (30 days)
Unlimited checks, 1 seat
- ✓Unlimited checks
- ✓Full signal history (forever)
- ✓Priority verification speed
- ✓Exportable pipeline report
- ✓Slack / webhook notifications
Unlimited, 5 seats
- ✓Everything in Pro
- ✓5 team seats
- ✓Shared pipeline dashboard
- ✓Custom verdict rules
- ✓White-label verdict emails
Common questions.
Freelancers, consultants, and small agencies who get client enquiries through booking tools like Cal.com, Calendly, or even just a public email. If inbound strangers can book time with you, this tool protects that time — and surfaces which inbounds are actually worth pursuing.
Start qualifying inbounds today.
Free during beta — 50 checks a month, no card required. Enter your email and we'll send you a sign-in link. Your account is ready in seconds.
No password. We email you a one-time sign-in link.