runsonwhat

21st's tech stack

What does 21st use?

21st (21st.dev) uses at least 36 tools we can see from public records, including Vercel for hosting, Google Workspace for email and documents, Mintlify for customer support and Google Analytics for analytics. Last checked .

“12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. Preview live, install with one command — for you and your AI agent.”

Industry
Engineering, Product and Design
Size
1–10 employees
Based in
San Francisco, United States
Founded
2025
LinkedIn
Company page
Re-check liveVisit 21st.dev
Tools found
36
Categories
17
Layers
5 of 5
Last checked
Oct 2026

21st'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

Application

13 tools, what the product is built with

Frontend

Auth & Identity

Backend & Database

AI

Payments & Billing

Media & UI

Data & Observability

5 tools, what they measure and store

Monitoring

Analytics

Go-to-market

5 tools, how they find and keep customers

Marketing

Ads & Pixels

Support & Docs

Company Ops

9 tools, what the team runs on day to day

Workspace

Collaboration

Dev Tools

Security & Compliance

Companies like 21st also use

Tools common among companies with a similar stack that we haven't found at 21st.

Companies with a stack like 21st's

Ranked by shared tools, with rare tools counting more.

More Engineering, Product and Design companies

Other Engineering, Product and Design companies we've checked.

21st tech stack FAQ

What tools does 21st use?

We've found 36 tools at 21st (21st.dev). Edge & Hosting: Cloudflare, Vercel and Railway. Application: React, Anthropic and Tailwind CSS. Data & Observability: Google Analytics, Google Tag Manager and Sentry. Go-to-market: Google Ads, Meta Pixel and X Ads. Company Ops: Google Workspace, Let's Encrypt and Sectigo. Last checked October 2, 2026.

What cloud does 21st run on?

21st uses Vercel, Railway and Fly.io for hosting. We found Vercel through custom domain, DNS records, website code and subprocessor list.

What email provider does 21st use?

21st uses Google Workspace for email and documents. We found Google Workspace through email records, subprocessor list and website code.

What does 21st use for customer support?

21st uses Mintlify for customer support. We found Mintlify through custom domain.

What payment provider does 21st use?

21st uses PayPal, Stripe and Metronome for payments. We found PayPal through website code.

What analytics tools does 21st use?

21st uses Google Analytics and Google Tag Manager for analytics. We found Google Analytics through website code.

Does 21st use Cloudflare?

Yes. We found Cloudflare at 21st through DNS records, subprocessor list and website code. Cloudflare is used by 565,691 companies we track.

How does runsonwhat know what 21st uses?

We read public traces only: 21st's DNS and email records, certificate logs, the code its website loads, and published subprocessor lists. A tool is listed only when a direct record backs it up. DNS is rechecked weekly and the website 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.