# What does Resend use? Resend (resend.com) shows public evidence of 29 tools, according to runsonwhat (last checked 2026-10-18). - Industry: Communication - Size: 11–50 employees - Based in: San Francisco, United States - Founded: 2023 - LinkedIn: https://www.linkedin.com/company/resend ## Edge & Hosting | Tool | Category | Evidence | Since | |---|---|---|---| | [Cloudflare](https://www.runsonwhat.com/reverse/cloudflare) | CDN & Edge | Custom domain | 2022-12 | | [Amazon Web Services](https://www.runsonwhat.com/reverse/aws) | Hosting & Cloud | Website code | | | [Amazon Route 53](https://www.runsonwhat.com/reverse/route53) | DNS | DNS records | | | [Amazon CloudFront](https://www.runsonwhat.com/reverse/cloudfront) | CDN & Edge | Custom domain | | | [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS verification records, DNS records, Website code | 2023-03 | ## Application | Tool | Category | Evidence | Since | |---|---|---|---| | [React](https://www.runsonwhat.com/reverse/react) | Frontend | Website code | | | [Tailwind CSS](https://www.runsonwhat.com/reverse/tailwind) | Frontend | Website code | | | [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code | | | [Anthropic](https://www.runsonwhat.com/reverse/anthropic) | AI | DNS verification records | | | [Stripe](https://www.runsonwhat.com/reverse/stripe) | Payments & Billing | DNS verification records, Website code | 2022-12 | | [Three.js](https://www.runsonwhat.com/reverse/threejs) | Media & UI | Website code | | | [Perplexity](https://www.runsonwhat.com/reverse/perplexity) | AI | Subprocessor list | | | [Google Gemini](https://www.runsonwhat.com/reverse/gemini) | AI | Subprocessor list | | ## Data & Observability | Tool | Category | Evidence | Since | |---|---|---|---| | [web-vitals](https://www.runsonwhat.com/reverse/web-vitals) | Monitoring | Website code | | | [Datadog](https://www.runsonwhat.com/reverse/datadog) | Monitoring | Website code | | | [PostHog](https://www.runsonwhat.com/reverse/posthog) | Analytics | Website code | | ## Go-to-market | Tool | Category | Evidence | Since | |---|---|---|---| | [Mintlify](https://www.runsonwhat.com/reverse/mintlify) | Support & Docs | Website code | | | [Dub](https://www.runsonwhat.com/reverse/dub) | Marketing | Custom domain | 2024-05 | | [Attio](https://www.runsonwhat.com/reverse/attio) | Sales & CRM | DNS verification records | | | [Plain](https://www.runsonwhat.com/reverse/plain) | Support & Docs | DNS verification records | | ## Company Ops | Tool | Category | Evidence | Since | |---|---|---|---| | [Google Workspace](https://www.runsonwhat.com/reverse/google-workspace) | Workspace | Email records, Website code | | | [Apple Business](https://www.runsonwhat.com/reverse/apple) | Workspace | DNS verification records | | | [dmarcian](https://www.runsonwhat.com/reverse/dmarcian) | Security & Compliance | Email records | | | [Notion](https://www.runsonwhat.com/reverse/notion) | Collaboration | DNS verification records | | | [Postman](https://www.runsonwhat.com/reverse/postman) | Dev Tools | DNS verification records | | | [Linear](https://www.runsonwhat.com/reverse/linear) | Dev Tools | DNS verification records | | | [Maven Central](https://www.runsonwhat.com/reverse/maven-central) | Dev Tools | DNS verification records | | ## FAQ ### What tools does Resend use? As of October 2026, runsonwhat has found 29 tools at Resend (resend.com) in public records. Edge & Hosting: Cloudflare, Amazon Web Services and Amazon Route 53. Application: React, Tailwind CSS and Next.js. Data & Observability: web-vitals, Datadog and PostHog. Go-to-market: Mintlify, Dub and Attio. Company Ops: Google Workspace, Apple Business and dmarcian. Last checked October 18, 2026. ### What cloud does Resend run on? Resend 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 resend.com. Amazon Web Services is used by 145,148 companies runsonwhat tracks. ### What CRM does Resend use? Resend uses Attio for its CRM, according to runsonwhat (October 2026). runsonwhat found Attio through a DNS verification record for Attio. Attio is used by 250 companies runsonwhat tracks. ### What email provider does Resend use? Resend uses Google Workspace for email and office software, alongside Apple Business, according to runsonwhat (October 2026). runsonwhat found Google Workspace through email records that authorize Google Workspace and code on resend.com. Google Workspace is used by 399,688 companies runsonwhat tracks. ### What does Resend use for customer support? Resend uses Mintlify for customer support and documentation, alongside Plain, according to runsonwhat (October 2026). runsonwhat found Mintlify through Mintlify code on resend.com. Mintlify is used by 1,093 companies runsonwhat tracks. ### What payment provider does Resend use? Resend uses Stripe for payments and billing, according to runsonwhat (October 2026). runsonwhat found Stripe through a DNS verification record for Stripe and code on resend.com, and Resend has used it since at least December 2022. Stripe is used by 26,780 companies runsonwhat tracks. ### How long has Resend used Cloudflare? Resend has used Cloudflare since at least December 2022, going by the first public certificate of the resend.com subdomain that points at Cloudflare. Other long-running tools at Resend include Stripe (since December 2022), Vercel (since March 2023) and Dub (since May 2024). ### Does Resend use Cloudflare? Yes. runsonwhat found Cloudflare at Resend through a subdomain that points at Cloudflare, in use since at least December 2022. Cloudflare is a CDN & Edge tool used by 696,383 companies runsonwhat tracks. ### Does Resend use AI tools? Yes. runsonwhat has found Anthropic, Perplexity and Google Gemini at Resend; Anthropic, for example, through a DNS verification record for Anthropic. AI services called only from servers leave no public trace, so Resend may use more AI tools than these. ### Which companies have a tech stack similar to Resend's? The companies with the stacks most like Resend's are Bird, Interfere, Tella and WorkOS, according to runsonwhat (October 2026). Each shares 13 to 17 tools with Resend, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices. ### How does runsonwhat know what Resend uses? runsonwhat reads public records only. Of the 29 tools at Resend, 11 were found through DNS records, 9 through code on resend.com, 4 through subdomains that point at the vendor, 2 through email records, 2 through its own subprocessor list and 1 through website configuration files. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and resend.com about monthly. --- Source: runsonwhat, https://www.runsonwhat.com/company/resend.com (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.