First's tech stack
What does First use?
First (first.io) uses at least 23 tools we can see from public records, including Amazon Web Services for hosting, Microsoft 365 for email and documents, Customer.io for marketing and Amazon CloudFront for content delivery. Last checked .
- Industry
- Software
- Size
- 11–50 employees
- Based in
- Durham, United States
- Company page
- Tools found
- 23
- Categories
- 8
- Layers
- 3 of 5
- Last checked
- Oct 2026
First's stack, layer by layer
Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.
Edge & Hosting
4 tools, where the bytes are served from
Hosting & Cloud
CDN & Edge
Go-to-market
14 tools, how they find and keep customers
Company Ops
5 tools, what the team runs on day to day
Email Delivery
Security & Compliance
Companies like First also use
Tools common among companies with a similar stack that we haven't found at First.
Companies with a stack like First's
Ranked by shared tools, with rare tools counting more.
CoohomSoftware · 1,001–5,000 people7in common
SnaplionIT Services · 11–50 people4in common
photoboxInternet · 11–50 people6in common
StaytunedInternet · 11–50 people4in common
Westminster FinanceFinancial Services · 11–50 people3in common
CompoundFinancial Services · 11–50 people6in common
Vra CricketHealth, Wellness and Fitness · 201–1,000 people3in common
ElocalMarketing and Advertising · 51–200 people9in common
More Software companies
Other Software companies we've checked.
First tech stack FAQ
What tools does First use?
As of October 2026, runsonwhat has found 23 tools at First (first.io) in public records. Edge & Hosting: Amazon Web Services, Amazon Route 53 and Google Cloud. Go-to-market: Google Ad Manager, Microsoft Xandr and Magnite. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked October 20, 2026.
What cloud does First run on?
First uses Amazon Web Services for hosting and cloud infrastructure, alongside Google Cloud, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through a subdomain that points at Amazon Web Services. Amazon Web Services is used by 145,155 companies runsonwhat tracks.
What email provider does First use?
First uses Microsoft 365 for email and office software, alongside Google Workspace, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365 and email records. Microsoft 365 is used by 705,167 companies runsonwhat tracks.
What marketing software does First use?
First uses Customer.io for marketing, according to runsonwhat (October 2026). runsonwhat found Customer.io through a subdomain that points at Customer.io and email records. Customer.io is used by 1,794 companies runsonwhat tracks.
Does First use SendGrid?
Yes. runsonwhat found SendGrid at First through email records that authorize SendGrid. SendGrid is a Email Delivery tool used by 192,117 companies runsonwhat tracks.
Which companies have a tech stack similar to First's?
The companies with the stacks most like First's are Coohom, Snaplion, photobox and Staytuned, according to runsonwhat (October 2026). Each shares 4 to 7 tools with First, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.
How does runsonwhat know what First uses?
runsonwhat reads public records only. Of the 23 tools at First, 12 were found through website configuration files, 4 through email records, 3 through DNS records, 3 through subdomains that point at the vendor and 1 through code on first.io. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and first.io about monthly.
We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.