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 | |
| Type | Private |
|---|---|
| Industry | Software |
| Founded | 2023 |
| Founders | Zeno Rocha Bu Kinoshita |
| Headquarters | San Francisco, California , United States |
Key people | Zeno Rocha (CEO) |
| Products | Email API, React Email |
Number of employees | 45[1] (2026) |
| Website | resend |
Resend is an American software company that provides an email API for developers, used to send transactional and marketing email programmatically.[2][3] The company is also the maintainer of React Email, an open-source library for building email templates with React components.[4]
History
[edit]Resend was founded in 2023 by Zeno Rocha and Bu Kinoshita.[4][3] Before founding the company, Rocha was VP of Developer Experience at WorkOS and Chief Product Officer at Liferay Cloud; Kinoshita was the first engineering hire at WorkOS.[4] The company participated in Y Combinator's Winter 2023 batch.[4]
In July 2023, Resend announced a $3 million seed round. Y Combinator and SV Angel participated, alongside angel investors including Elad Gil, Lachy Groom, Dylan Field (Figma), Guillermo Rauch (Vercel), Paul Copplestone (Supabase), and Calvin French-Owen (Segment).[3]
In December 2024, the company raised an $18 million Series A round led by Andreessen Horowitz, with participation from existing investors Y Combinator and Basecase.[5]
In June 2026, Resend reported that more than 3 million users had signed up for the service.[6]
Acquisitions
[edit]In April 2025, Resend acquired Mergent, a serverless background-job service that was part of Y Combinator's Summer 2021 batch.[7]
In August 2025, Resend acquired Briefer, a data-analytics startup from Y Combinator's Summer 2023 batch.[8]
Technology
[edit]Resend offers a REST API and SMTP service for sending email, with SDKs for languages including Node.js, Python, Ruby, PHP, Go, Rust, Java, and .NET.[2] Features include webhooks for delivery events, multi-region sending, and managed dedicated IP addresses.[2] In November 2025, the company added inbound email handling to the platform.[9] Resend states it is SOC 2 and GDPR compliant.[2]
The company maintains React Email, an open-source project for composing emails with React components.[4] Version 6.0 was released in April 2026.[10]
Recognition
[edit]In 2024, Resend was named to Redpoint's InfraRed 100, an annual list of private cloud-infrastructure companies.[11]
In 2026, it was included in the early-stage category of the Enterprise Tech 30, an annual ranking of private enterprise-technology companies compiled by Wing Venture Capital.[12]
References
[edit]- ^ "Humans". Resend. Retrieved 2026-06-25.
- ^ a b c d "Resend — Email for developers". Retrieved 2026-06-25.
- ^ a b c Lardinois, Frederic (2023-07-18). "Developer-focused email platform Resend raises $3M". TechCrunch. Retrieved 2026-06-25.
- ^ a b c d e "Resend: Email for developers". Y Combinator. Retrieved 2026-06-25.
- ^ Li, Yoko (2024-12-04). "Investing in Resend". Andreessen Horowitz. Retrieved 2026-06-25.
- ^ "3,000,000 users". Resend. June 2026. Retrieved 2026-06-25.
- ^ "Resend acquires Mergent". Resend. April 2025. Retrieved 2026-06-25.
- ^ "Resend acquires Briefer". Resend. 2025-08-05. Retrieved 2026-06-25.
- ^ "Cloudflare Introduces Email Service to Compete with Amazon SES, Resend, and SendGrid". InfoQ. October 2025. Retrieved 2026-06-25.
- ^ "This Week in React #278". This Week in React. April 2026. Retrieved 2026-06-25.
- ^ "Redpoint Ventures Announces 2024 Recipients of InfraRed 100 List". Business Wire. 2024-06-18. Retrieved 2026-06-25.
- ^ Newcomer, Eric (2026-03-31). "Mintlify, Serval, ElevenLabs & Anthropic Top Enterprise Tech 30 VC Survey". Newcomer. Retrieved 2026-06-25.
External links
[edit]Category:Software companies based in the San Francisco Bay Area Category:American companies established in 2023 Category:Y Combinator companies Category:2023 establishments in California