React Email
Open-source React components for building responsive, cross-client HTML emails — the transactional and lifecycle emails your product sends
React Email is an open-source library of React components for building responsive HTML emails that render consistently across Gmail, Outlook, Apple Mail, and the rest. It is MIT-licensed, built and maintained by the team behind Resend, and has 19,427 GitHub stars as of July 2026. It solves a real, tedious problem — writing table-based email HTML that survives every inbox — so the welcome, onboarding, and lifecycle emails you send actually look right. But React Email only helps you build the email; it doesn't decide what to send, to whom, or how to get people onto your list in the first place. That upstream work — the signups and the lifecycle strategy — is where growth actually happens.
What React Email is
React Email (github.com/resend/react-email) is an open-source component library for writing HTML emails in React and TypeScript instead of hand-coding the table-based markup email clients still require. It ships a set of primitives — Html, Head, Button, Container, Section, Heading, a Tailwind wrapper, and more — that compile to email-ready HTML and plain text, and it papers over the notorious rendering differences between Gmail, Outlook, Apple Mail, Yahoo, and others. It is MIT-licensed and maintained by Resend, and its components are provider-agnostic: the same template can be sent through Resend, Nodemailer, SendGrid, Postmark, AWS SES, or any other service.
- React + TypeScript templates — compose emails from typed components with real code reuse, instead of copy-pasting fragile HTML tables.
- Cross-client rendering — components are tested against the major inboxes so a design doesn't quietly break in Outlook.
- Dark mode and responsive — handles the inconsistencies between clients, including dark mode, without per-client hacks.
- Provider-agnostic output — renders to standard HTML you can send through any email API, with worked examples for Resend, Nodemailer, SES, SendGrid, and Postmark.
Where React Email fits a founder's growth stack
Email is one of the highest-leverage growth channels a founder owns outright — no algorithm sits between you and the inbox. The lifecycle emails that drive activation and retention — a welcome sequence, an onboarding nudge, a trial-ending reminder, a win-back — all have to be built before they can be sent, and React Email is where that building happens. It sits at the template layer: you design the email once, in code, and reuse it across every send. In building AgentCeres, our own welcome and trial-started emails go out through Resend, the company behind React Email, so this is a stack we run on rather than one we have only read about.
The template layer matters for growth because a lifecycle email only works if people actually read it, and rendering is part of that. A welcome email that looks broken in Outlook erodes trust at the exact moment a new user is deciding whether to stick around. Getting the craft right is table stakes — but it is downstream of the two things that decide whether email moves your numbers: how many of the right people are on your list, and whether the sequence says the right thing at the right moment. For the strategy behind those sends, see how do I start a newsletter for my startup and the lifecycle email playbook.
What React Email doesn't do — and what to pair it with
React Email builds the email; it does not send campaigns, manage a subscriber list, decide who receives what, or bring anyone to your product to subscribe in the first place. Like Listmonk on the sending-and-list side, it is a focused tool — the craft layer, not the growth strategy.
| React Email handles… | …the growth work around it |
|---|---|
| Designing the email template in code | the content and launches that grow the list you're emailing |
| Cross-client, responsive rendering | the lifecycle strategy that decides which email to send when |
| Producing send-ready HTML | the signup conversion that turns email readers into activated users |
This is where AgentCeres — the AI Growth Officer (agentceres.com) fits alongside a tool like React Email. AgentCeres is a managed AI marketing team: specialists draft the lifecycle sequences, the content that grows your list, and the launches that fill the top of the funnel — and you approve every outbound send before it goes out. React Email makes the email render; the team helps you decide what to say and earns the audience to say it to. For how AI answer engines factor into being found, see generative engine optimization.
FAQ
- Is React Email free?
- Yes. React Email is open-source under the MIT license, so it is free to use, self-host, and modify, with no per-seat or per-email fee. It is built and maintained by Resend, which sells a paid email-sending API, but React Email itself is an independent open-source library you can use with any email provider — Nodemailer, SendGrid, Postmark, AWS SES, and others — not only Resend.
- How is React Email different from an email marketing tool like Mailchimp?
- They solve different problems. React Email is a developer library for building the email template in code so it renders correctly across inboxes; it does not send bulk campaigns, store your subscriber list, or report opens and clicks. A marketing platform like Mailchimp, or an open-source sender like Listmonk, manages the list and does the sending. Many teams use React Email to design the template and a separate service to send it.
- Do I need to know React to use it?
- Yes — React Email is aimed at developers comfortable with React and TypeScript, since templates are written as React components. That is exactly why it fits founders building a product in a modern web stack: the emails live in the same codebase and language as the app. If you don't write React, a no-code email builder inside a marketing platform will be a faster path.
You built it. Now grow it.
AgentCeres is a managed AI marketing team — specialists draft the SEO, social, and outreach that fill your links, you approve what ships. 14-day free trial, from $19/month.