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Resend

Email API for developers; templates as React components via React Email.

Visit resend.com ↗Pricing & calculatorAlternatives
Works with AI agents:llms.txtBuilt into Bolt, Lovable, Replit
Ask your AI about this, with this page as the source:ChatGPT ↗Claude ↗Perplexity ↗

Resend is a hosted service for sending email from your application: sign-up confirmations, password resets, receipts and other messages triggered by user actions, plus bulk "Broadcasts" sent to a stored contact list. You verify your own domain with DNS records and send from addresses on it.

Your server calls the REST API with an API key; calls from the browser are blocked by CORS, so sending always happens server-side. Each domain is tied to one sending region (N. Virginia, Ireland, São Paulo or Tokyo). There are official SDKs for Node.js, Python, Ruby, PHP, Go, Rust, Elixir, Java and .NET, and an SMTP relay for tools that only speak SMTP, such as Supabase Auth or Nodemailer. Templates can be written as React components with React Email.

A small team gets production sending from the first day, with no sandbox or approval step; signed webhooks for events such as delivered, bounced, complained, opened and clicked; inbound email at your domain or a resend.app address, delivered to you as a webhook; and idempotency keys so a retried request doesn't send twice.

Region only controls where mail is sent from: account data, logs and metadata are stored in the United States, so it doesn't meet strict EU data-residency requirements. It is not HIPAA compliant and won't sign a BAA. The API allows 10 requests per second per team by default.

Where it fits

Transactional Email · Transactional APIA modern developer API with email templates written as React components.Trade-off: A younger service than Postmark or SES, and costlier than SES at very high volume.

How Resend itself is built

3 tools, from its own code, website and Product Hunt page.

Next.jsPostHogVercel

Who uses it

944 makers' products, each linked to the source that shows it, and 54 open-source projects that declare it in their code.

The maker says so 168Subprocessor list 41Seen on the website 836Declared in code 95How evidence is collected →
inbox-zeroOpen-source AI email assistant that triages, labels and drafts replies to help clear you…

“Love how simple and clean Resend is for transactional email campaigns”

Transactional EmailMaker says so +3 · source ↗
RightNow AICode editor for GPU/CUDA development with built-in profiling, benchmarking and AI-assist…

“Resend powers our transactional emails, I love Resend”

Transactional EmailMaker says so +2 · source ↗
PrelintPrevent product drift in AI-written code

“Resend powers the emails that keep Prelint users moving - from onboarding to review notifications. Fast to ship, and reliable in production.”

Transactional EmailMaker says so +2 · source ↗
SublayBackend and SDKs for social features — posts, comments, votes, follows, chat and notific…

“Simple API, excellent deliverability, and a great developer experience out of the box.”

Transactional EmailMaker says so +2 · source ↗
ProductlaneCustomer support tool built on Linear, with a shared inbox for chat, Slack and email plu…

“Resend is our tool of choice when it comes to emailing. The Resend API has made sending transactional emails easy for us - super reliable, fast, and developer-friendly. The guys behind Resend are super helpful and always happy to support us with all our needs, with passion and drive for the service they are building!”

Transactional EmailMaker says so +1 · source ↗
FlexpriceUsage-based pricing and billing for developers

“Bulletproof email delivery for sending invoices, payment links, and alerts to our users.”

Transactional EmailMaker says so +1 · source ↗
PolarOpen-source merchant of record aimed at developers: subscriptions, usage billing, licens…

“Polar Newsletters enable developers to write in GitHub flavoured markdown with code embeds + highlighting supported built-in. It's all powered by Resend under the hood and their API and SDKs have been great to work with.”

Transactional EmailMaker says so +1 · source ↗
KonfideAI Agents with a human expert for hire

“All of Konfide's automated email — welcome sequences, weekly digests, founding member onboarding. Clean API, great deliverability, dead simple to set up.”

Transactional EmailMaker says so +1 · source ↗
AgentcardIssues virtual debit cards to AI agents such as Claude or OpenClaw so they can pay for t…

“Resend handles all our transactional email — magic links, card notifications, receipts. Clean API, reliable delivery, and a developer experience that feels like it was built by people who actually send email.”

Transactional EmailMaker says so +1 · source ↗
FlowgladFlowglad is an open-source payments and billing provider that apps integrate without web…

“Resend has been been a dream of an email provider”

Transactional EmailMaker says so +1 · source ↗
Git PitcherReverse engineer any GitHub repo into an agent-ready plan

“Resend powers Git Pitcher’s transactional emails. It keeps the email setup simple and reliable for product notifications.”

Transactional EmailMaker says so +1 · source ↗
Pluto DoorSecure MacOS SSH with AI editor, file browser, drag-drop

“Needed license emails that actually reach the inbox. Resend nailed it. Setup was simple — verify domain, grab an API key, and use SMTP with Nodemailer. Emails deliver in seconds, and the dashboard shows sent, delivered, and opened. SendGrid feels complex, Amazon Simple Email Service approval takes time, and Mailgun feels dated. Resend is clean, developer-friendly, and it just delivers.”

Transactional EmailMaker says so +1 · source ↗
RefgrowLets SaaS founders launch affiliate and referral programs.

“Clean, developer-friendly email API. We use it for all transactional emails — affiliate invitations, payout notifications, onboarding sequences. Just works.”

Transactional EmailMaker says so +1 · source ↗
stagewiseThe frontend coding agent for existing codebases

“Resend has an awesome UX. Everyone who sends emails in their app should give it a try.”

Transactional EmailMaker says so +1 · source ↗
GetThisGenerate tasks from voice, text, or screenshots.

“Email for developers. Hands-down the easiest email platform we’ve used. Extremely developer-friendly and great defaults.”

Transactional EmailMaker says so +1 · source ↗
PayPingTracks subscriptions and recurring bills, sends renewal reminders and shows spending das…

“Easiest platform to setup for email. Most developer friendly. Good free plan. LOVE you guys!”

Transactional EmailMaker says so +1 · source ↗

Open source: a project that declares Resend as a dependency in its public code — verifiable, but not necessarily a live product.

What makers say

126 makers on why they use Resend, in their own words on Product Hunt.

Honestly, it came down to how clean the API is for agentic workflows. Basement's AI agents (Baselings) send emails autonomously on behalf of users, outreach, price alerts, deal notifications. So we needed an email provider that felt built for code, not for marketers clicking around a dashboard. Resend's API is so straightforward that plugging it into our agent tool suite took maybe 20 minutes. No wrestling with SMTP configs, no convoluted SDKs. When your AI agent needs to fire off an email as part of a multi-step autonomous task, the last thing you want is friction at the email layer. Resend just gets out of the way. Also the DX is genuinely great. the logs, the dashboard, React Email support. For a two-person team shipping fast, that stuff matters. Not to mention how open they are to feedback and supporting us.
Basement BrowserSep 2026 ↗
Honestly, it came down to how clean the API is for agentic workflows. Basement's AI agents (Baselings) send emails autonomously on behalf of users, outreach, price alerts, deal notifications. So we needed an email provider that felt built for code, not for marketers clicking around a dashboard. Resend's API is so straightforward that plugging it into our agent tool suite took maybe 20 minutes. No wrestling with SMTP configs, no convoluted SDKs. When your AI agent needs to fire off an email as part of a multi-step autonomous task, the last thing you want is friction at the email layer. Resend just gets out of the way. Also the DX is genuinely great. the logs, the dashboard, React Email support. For a two-person team shipping fast, that stuff matters. Not to mention how open they are to feedback and supporting us.
Basement BrowserMar 2026 ↗
Resend gives Chronock a clean developer experience for transactional email. We use it for localized sign-in codes, organization invitations, booking updates, and product messages. Compared with Postmark or Mailgun, its API and TypeScript-first workflow felt especially direct, letting a small team keep templates and delivery code close to the product without unnecessary operational overhead.
ChronockSep 2026 ↗
Amazing developer experience, great UX (no visual clutter) and high deliverability/reliability. We started out using MailChimp but quickly felt like they were just throwing a bunch of features in our faces that we didn't ask for. It felt near impossible to just send a plain text email to all our contacts. Resend just removed all the headache over night. Easy to get started, easy to use.
StrawberrySep 2026 ↗
Needed license emails that actually reach the inbox. Resend nailed it. Setup was simple — verify domain, grab an API key, and use SMTP with Nodemailer. Emails deliver in seconds, and the dashboard shows sent, delivered, and opened. SendGrid feels complex, Amazon Simple Email Service approval takes time, and Mailgun feels dated. Resend is clean, developer-friendly, and it just delivers.
Pluto DoorSep 2026 ↗

Loved and watch-outs

Themes that recur in makers' words and Hacker News comments, each linked to what it summarises, with how Product Hunt tags its reviews.

Most loved
  • The API is clean and TypeScript-first, simple enough to call with a plain fetch and no SDK. PHPH 2
  • Transactional email goes live within a day, with DNS setup and deliverability basics handled. PHPH 2
  • The free tier is generous enough to build and test before paying. PHPH 2HNHN 2
  • Slots easily into Next.js, Supabase and Cloudflare Workers stacks, including magic-link sign-in. PHHNHN 2PH 2
Watch-outs
  • It runs on AWS SES, so an AWS us-east-1 outage stopped both its dashboard and email sending. HNPH
  • API gaps remain, such as the broadcast API not returning email content and no stored copy of sent threads. HNHN 2
On Product Hunt 4.9★ · 252 reviews
easy setup 24developer-friendly API 22reliable delivery 19fast integration 16simple UI 11high deliverability rates 8React Email integration 7free tier 5slow performance 2
Read the reviews on Product Hunt ↗

Who switches

Public pull requests on GitHub since Oct 2024 whose title says "X to Y" — real code changes moving a project from one tool to another, by developers in general. Open a row to see the pull requests.

SendGrid → Resend60 PRs
SendGrid vs Resend compared →All matching pull requests on GitHub ↗
Amazon SES → Resend16 PRs
Amazon SES vs Resend compared →All matching pull requests on GitHub ↗
Mailgun → Resend3 PRs
Mailgun vs Resend compared →All matching pull requests on GitHub ↗
Postmark → Resend3 PRs
Postmark vs Resend compared →All matching pull requests on GitHub ↗
Resend → SendGrid17 PRs
Resend vs SendGrid compared →All matching pull requests on GitHub ↗
Resend → Amazon SES15 PRs
Resend vs Amazon SES compared →All matching pull requests on GitHub ↗
Resend → Postmark6 PRs
Resend vs Postmark compared →All matching pull requests on GitHub ↗

Alternatives to Resend

All alternatives by situation →
PostmarkDeliverability when the mail has to arrive within seconds.Free tier615 makers · transactional emailCompare with Resend →
MailgunHigh volume and inbound email parsing and routing.Free tier49 makers · transactional emailCompare with Resend →
SendGridOne vendor for both jobs at large scale.1061 makers · transactional emailCompare with Resend →
Amazon SESSending at high volume, where cost per email matters more than tooling.4 makers · transactional emailCompare with Resend →
PlunkTransactional emails, event-triggered sequences and newsletters in one open-source tool, billed per email with no monthly fee.Open sourceFree tier5 makers · transactional email
NodemailerSending email from Node.js through any SMTP server or provider, without tying your code to one vendor's SDK.Open sourceFree tier
useSendAn open-source Resend-style dashboard and API for transactional and marketing mail, on top of Amazon SES prices.Open sourceFree tier

On Product Hunt, people weigh it against: Loops, Postmark, Mailgun, Plunk.

Questions makers ask about Resend

Do I need approval before I can email real users?

No. Every account, free ones included, can send to any recipient as soon as a domain is verified; there is no sandbox mode or review queue. source ↗

If I pick the EU region, does my data stay in the EU?

No. The region decides where emails are dispatched from; account data, email metadata and logs are kept in the US whichever region you choose. source ↗

Is it SOC 2, GDPR or HIPAA compliant?

It has a SOC 2 Type II report and a pre-signed GDPR DPA you can download from the dashboard. It is not HIPAA compliant and cannot sign a Business Associate Agreement. source ↗

Can I send directly from my frontend code?

No. Requests from the browser fail with CORS errors by design; send from your backend so the API key stays secret. source ↗

Can it receive email as well as send it?

Yes. Mail sent to your verified domain or to your account's resend.app address triggers a webhook, and you can fetch the content and attachments, forward it or reply in the same thread. source ↗

What are the API rate limits?

By default 10 requests per second per team, shared across all API keys; beyond that you get 429 responses. Trusted senders can ask support for a higher limit. source ↗

Can I plug it into Supabase Auth or another tool over SMTP?

Yes. Point the tool at smtp.resend.com on port 465 with the username "resend" and an API key as the password. source ↗

How long are email logs kept?

Email and log data is kept for 30 days on the Free, Pro and Scale plans; after an account is closed, remaining data is deleted within 90 days. source ↗

Is Resend free?

Yes — there is a free tier a small product can run on; paid use starts at $20/mo. source ↗

Is Resend open source or self-hostable?

Not open source, and hosted only.

Can AI coding agents work with Resend?

It serves an llms.txt docs index; Bolt, Lovable, Replit set it up natively.

Who uses Resend?

944 makers' products we track, each with a source, and 54 open-source projects declare it in their code. source ↗