37signals is a privately held American web software company founded in 1999 in Chicago, Illinois. The company is best known for creating Basecamp, a widely used project management and team communication platform, and HEY, an email service. Originally a web design firm, 37signals pivoted to software product development in 2004 and also originated the open-source Ruby on Rails web framework. The company operates on a subscription/SaaS revenue model and is known for its opinionated culture around calm, profitable, small-team business practices. It also offers ONCE (self-hosted software) and Fizzy as additional products. Signal Plug searches live against 37signals.com's mail server to find and verify email addresses for any 37signals employee.
Signal Plug searches live against 37signals.com's mail server — not a static database. Get a verified email for any 37signals employee with confidence score in under 2 seconds.
94% accuracy · No credit card required · 10 free searches/month
37signals is a privately held American web software company founded in 1999 in Chicago, Illinois. The company is best known for creating Basecamp, a widely used project management and team communication platform, and HEY, an email service. Originally a web design firm, 37signals pivoted to software product development in 2004 and also originated the open-source Ruby on Rails web framework. The company operates on a subscription/SaaS revenue model and is known for its opinionated culture around calm, profitable, small-team business practices. It also offers ONCE (self-hosted software) and Fizzy as additional products.
The most commonly verified format at 37signals:
High ConfidenceSecondary format also observed: firstname@hey.com
Signal Plug tests all common patterns against 37signals's live mail server and returns whichever passes the SMTP check.
Run a live search for 37signals →Data-driven signals to help you prospect 37signals effectively.
Primary Contact
CTO
9–11am CST (10am–12pm EST)
Tech hub — decision-makers reachable
From 1 employees in 1999 to ~75 in 2026.
Signal Plug performs live SMTP verification against 37signals.com's mail server — not a static scraped database — which means results reflect the real, current state of 37signals's email infrastructure. Here's how to run a lookup:
Create a free account
Sign up at Signal Plug in under 30 seconds. No credit card required. The Free plan includes 10 searches per month so you can test the tool with real 37signals contacts before upgrading.
Enter the contact's name
Type the first and last name of the 37signals employee you want to reach. Signal Plug handles all seniority levels, from C-suite to individual contributors.
Enter the domain
Use 37signals.com. Signal Plug tests all common naming patterns automatically and returns only the format that passes the SMTP check.
Get a verified result
Signal Plug returns an email address with a confidence score (0–100) and deliverability status (Valid, Risky, or Catch-all) within 2 seconds. The confidence score tells you how reliable the result is before you use it.
Export and use
One-click CSV export lets you bring 37signals contacts into Salesforce, HubSpot, Outreach, Lemlist, or any other tool in your stack. Growth and Scale plan users can run bulk lookups across an entire list of 37signals names in a single batch.
37signals competes directly with Asana, Monday.com, Trello and others in the Technology space.
| Company | Size | Tier | Focus | Email Format |
|---|---|---|---|---|
| 37signals | 51–100 | Small | Project Management & Collaboration Software | firstname |
| Asana | — | — | — | firstname.lastname |
| Monday.com | — | — | — | firstname.lastname |
| Trello | — | — | — | firstname.lastname |
| Slack | — | — | — | firstname.lastname |
| Notion | — | — | — | firstname.lastname |
Based on industry, headcount tier, and growth signals, these companies share a similar profile:
Whether you're running outbound sales, recruiting, or building a partnership list, these are the roles most frequently contacted at Technology like 37signals.
Based on 37signals's profile, the highest-value contacts for outbound are:
Signal Plug works for any role at any seniority level at 37signals.com. If you have a name and the domain, you can find a verified email.
How well 37signals fits a typical B2B outbound pipeline, based on available signals.
Strong Fit
Funnel Fit Score
Most email finder tools pull from static databases of scraped email addresses. These databases go stale as people change jobs and companies update their email infrastructure. Signal Plug takes a different approach: every search performs a live check against 37signals.com's mail server using SMTP verification. This means results reflect the current state of 37signals's email system — not a cached result from months or years ago.
Signal Plug enriches every result with supporting data: a confidence score (0–100), deliverability status (Valid, Risky, or Catch-all), job title where available, and LinkedIn profile URL. This context helps you prioritize which 37signals contacts to email first and personalize your outreach before you hit send. Given 37signals's small footprint (51–100 employees), Growth plan users at $149/month get the search volume needed for a full account campaign. Plans start at $29/month for 500 searches — no annual contracts or seat fees.
Signal Plug performs a live SMTP check against 37signals.com's mail server for every query — not a static database lookup. Our platform-wide accuracy rate is 94%. Each result comes with a confidence score (0–100) so you can gauge reliability before using the address.
Free plan: 10 searches. Starter ($29/mo): 500. Growth ($149/mo): 2,000. Scale ($299/mo): 5,000. No company-specific caps.
No. Signal Plug generates and verifies emails in real time via SMTP checks — no static database of 37signals employee emails is maintained.
Yes. Growth and Scale plan users can upload a CSV of names and run bulk lookups against 37signals.com in a single batch.
37signals is a web software company that makes Basecamp (project management), HEY (email), Fizzy, and ONCE (self-hosted software).
Jason Fried, Carlos Segura, and Ernest Kim co-founded the company in 1999.
David Heinemeier Hansson created Ruby on Rails internally at 37signals before open-sourcing it in 2004.
In May 2022, the company reverted from Basecamp to 37signals to better reflect its multi-product focus on Basecamp and HEY.
Signal Plug searches in real time against 37signals.com's mail server to find and verify email addresses for 37signals employees. Enter a name, enter the domain, get a verified result with a confidence score in under 2 seconds.
Start finding emails free →10 free searches · No credit card required · Upgrade from $29/month