Fern's tech stack
What does Fern use?
Fern (buildwithfern.com) uses at least 27 tools we can see from public records, including Amazon Web Services for hosting, Google Workspace for email and documents, Apollo.io for sales and Mintlify for customer support. Last checked .
“Start with OpenAPI. Generate SDKs in multiple languages, interactive API documentation, and an agent-first CLI.”
- Industry
- Engineering, Product and Design
- Size
- 11–50 employees
- Based in
- New York City, United States
- Founded
- 2022
- Company page
- Tools found
- 27
- Categories
- 16
- Layers
- 5 of 5
- Last checked
- Oct 2026
Fern'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
5 tools, where the bytes are served from
Hosting & Cloud
Application
7 tools, what the product is built with
Auth & Identity
Payments & Billing
Search
Data & Observability
5 tools, what they measure and store
Go-to-market
8 tools, how they find and keep customers
Website & CMS
Marketing
Sales & CRM
Support & Docs
Company Ops
2 tools, what the team runs on day to day
Workspace
Security & Compliance
Companies like Fern also use
Tools common among companies with a similar stack that we haven't found at Fern.
Companies with a stack like Fern's
Ranked by shared tools, with rare tools counting more.
WeaveEngineering, Product and Design · 11–50 people15in common
GigsEngineering, Product and Design · 51–200 people14in common
Get Lago Corp.Finance and Accounting · 11–50 people16in common
SuperwallEngineering, Product and Design · 11–50 people13in common
ReductoEngineering, Product and Design · 11–50 people14in common
turbopufferturbopuffer.com11in common
Goldskygoldsky.com14in common
Bralebrale.xyz11in common
More Engineering, Product and Design companies
Other Engineering, Product and Design companies we've checked.
embraceEngineering, Product and Design · 51–200 people
GreptileEngineering, Product and Design · 11–50 people
Momentic AIEngineering, Product and Design · 11–50 people
DepotEngineering, Product and Design · 11–50 people
HumanloopEngineering, Product and Design · 11–50 people
NangoEngineering, Product and Design · 1–10 people
Fern tech stack FAQ
What tools does Fern use?
As of October 2026, runsonwhat has found 27 tools at Fern (buildwithfern.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon Route 53. Application: React, Tailwind CSS and Next.js. Data & Observability: Google Analytics, Google Tag Manager and web-vitals. Go-to-market: Google Ads, Microsoft Ads and LinkedIn Insight Tag. Company Ops: Google Workspace and Tailscale. Last checked October 23, 2026.
What cloud does Fern run on?
Fern uses Amazon Web Services for hosting and cloud infrastructure, alongside Vercel, according to runsonwhat (October 2026). runsonwhat found Amazon Web Services through Amazon Web Services code on buildwithfern.com. Amazon Web Services is used by 145,818 companies runsonwhat tracks.
What sales tools does Fern use?
The sales tools runsonwhat has found at Fern are Apollo.io (October 2026); no CRM shows up in Fern's public records. runsonwhat found Apollo.io through a subdomain that points at Apollo.io. Apollo.io is used by 11,258 companies runsonwhat tracks.
What email provider does Fern use?
Fern uses Google Workspace for email and office software, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on buildwithfern.com. Google Workspace is used by 403,703 companies runsonwhat tracks.
What does Fern use for customer support?
Fern uses Mintlify for customer support and documentation, alongside Pylon, according to runsonwhat (October 2026). runsonwhat found Mintlify through Mintlify code on buildwithfern.com. Mintlify is used by 1,127 companies runsonwhat tracks.
What payment provider does Fern use?
Fern uses Stripe for payments and billing, according to runsonwhat (October 2026). runsonwhat found Stripe through a DNS verification record for Stripe and code on buildwithfern.com. Stripe is used by 28,716 companies runsonwhat tracks.
Does Fern use Cloudflare?
Yes. runsonwhat found Cloudflare at Fern through Cloudflare code on buildwithfern.com. Cloudflare is a CDN & Edge tool used by 705,592 companies runsonwhat tracks.
Which companies have a tech stack similar to Fern's?
The companies with the stacks most like Fern's are Weave, Gigs, Get Lago and Superwall, according to runsonwhat (October 2026). Each shares 13 to 16 tools with Fern, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.
How does runsonwhat know what Fern uses?
runsonwhat reads public records only. Of the 27 tools at Fern, 15 were found through code on buildwithfern.com, 7 through subdomains that point at the vendor, 4 through DNS records and 1 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and buildwithfern.com 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.