Know who signed up and which ones to email
An AI agent works out who each new signup is, Gmail included where it can, scores the fit and drafts an email in your voice. Every morning you get the 5 worth emailing.
The signup problem
Free signups come in every day, and many use a Gmail address.
So you can’t tell who they are, and good leads go cold.
The tools that fix this need a growth engineer to set up, or cost $10K+ a year.
Daily digest
Every morning, who signed up and the 5 worth emailing
It lands in Slack or your inbox. Each person comes with their company, a fit score and, for the good fits, an email drafted in your voice for you to send.
41new signups
27identified
5worth emailing
From today’s digest:
-
Strong fit
Priya Shah · Head of Growth, Northwind
Work email, 24-person B2B SaaS team. Draft ready in your voice.
-
From Gmail
dana.ruiz@gmail.com · Dana Ruiz, founder of Kestrel Labs
Worked out from the Gmail address. A close fit for who you sell to. Draft ready.
-
Weak fit
j.ortiz@university.edu · student
Kept out of the 5 worth emailing today.
-
Not identified
mlee82@gmail.com
We couldn’t confirm who this is, so it stays out of the 5 and is marked unknown.
Person and company
Worked out from the email, Gmail included where it can.
A fit score
How well each signup matches the companies you sell to.
A draft in your voice
Written for the good fits. You read it and send it yourself.
What happens to each new signup
Your signup feed goes in. The agent works out who each person is, scores the fit, drafts the email for the good ones and puts it all in one digest.
Your signups
- Work emails
- Gmail addresses
- Other personal emails
- Who you sell to
The agent works out
- Personand company
- Fit scoreand a draft
You get
Your daily digest Example
- PSPriya ShahStrong fit
- DRDana RuizFrom Gmail
- ?mlee82@gmail.comNot identified
In Slack or your inbox, every morning
70%
of inbound leads arrive as personal emails nobody can identify, a VP of Sales told Crustdata in April 2026.
Why it’s hard
Personal emails are the hardest signups to identify
- About 80–90% of personal-email trial signups use Gmail From Common Room’s playbook on enriching Gmail signups.
- About 25% of personal emails get identified, against about 90% of work emails So the digest says plainly which signups we couldn’t identify, and keeps them out of the ones worth emailing.
What founders use today to see who signed up
Clay and Common Room can enrich signups once someone builds the setup, Warmly starts at $10K a year, RB2B looks at website visitors, and Unify adds website and product signals on its custom plan. Whosigned does the work for you.
Day one
Start with your last 30 days of signups
On day one we run it on the signups you already have. You see who they were, which ones we couldn’t identify, and the 10 worth emailing.
Who it’s for
- Seed to Series A B2B SaaS and AI startups
- Free or self-serve signups every week
- No one on sales operations yet
We’re opening early access to a few founder-led startups.
Common questions
What founders ask before they connect a signup feed.
- What does it connect to?
- Your signup feed. Each new signup goes to the agent, and the digest comes to you in Slack or by email.
- Can it identify Gmail signups?
- Some of them. Syft reports about 25% success on personal emails, against about 90% on work emails. When we can’t confirm who someone is, the digest says so and keeps them out of the ones worth emailing.
- Who sends the emails?
- You do. The agent drafts each email in your voice, and you read it and send it yourself.
- What’s in the daily digest?
- Everyone who signed up, who they are where we could find out, how well they fit, and the 5 worth emailing with a draft for each.
- What do I get on day one?
- We run it on your last 30 days of signups and show you who they were and the 10 worth emailing.
- How is it different from Clay, RB2B or Common Room?
- Clay and Common Room can do this once someone sets them up, and RB2B looks at website visitors. Whosigned is done for you, for founders without a growth engineer.
- Who is it for?
- Founders at Seed to Series A B2B SaaS and AI startups with self-serve signups and no one on sales operations.
- What does it cost?
- We’re setting the price with our early-access startups. Join the waitlist and you’ll see it before you commit to anything.