Unitpost vs Resend

Resend is a developer-first transactional email API, known for the cleanest DX in the category and for React Email. Unitpost covers transactional and marketing email in one product with unlimited contacts on paid plans and a free tier of 5,000 emails a month. Across 15 compared capabilities, Unitpost leads on 11 and Resend leads on 1.

Which should you choose?

Choose Resend if

You need an Elixir SDK (we ship Node, Python, Ruby, PHP, Laravel, Go, Java, Rust, and .NET)
You only ever send transactional email and want the most battle-tested option in that lane
You want the largest community and the most third-party tutorials to lean on

Choose Unitpost if

You send both transactional and marketing email and don't want to pay on two axes or reconcile two contact lists
You want unlimited contacts instead of contact-count pricing on the marketing side
Non-developers on your team need to edit templates without touching code — but you still want code mode for the same document
You want inbound email, an SMTP relay, and an MCP server for AI agents in the same product
You want SMS on the same contacts, API key, and bill as your email (paid plans)

What Resend does well

Stated plainly, because a comparison that pretends otherwise is not worth reading.

The API shape and error semantics that set the modern standard — we deliberately match them
React Email is the de-facto way to build email in React, and Resend maintains it
A permanent free tier — 5,000 emails/month vs SendGrid's retired free plan
Broad SDK coverage across nine languages plus Elixir, which we match on everything but Elixir

Pricing and free tier

Unitpost: 5,000 emails/month, 200/day, no credit card; On paid plans your monthly price is a sending allowance you spend at your tier's rate, and it refreshes every month. Marketing and unlimited contacts are included rather than billed as add-ons.
Resend: 5,000 emails/month; Transactional priced per volume, with Marketing (audiences + broadcasts) billed separately by contact count — so a team doing both pays on two axes.

Resend pricing and free-tier details last verified 2026-07. Providers change these often — check their pricing page before making a decision.

Feature comparison

Feature and pricing comparison between Unitpost and Resend
Capability	Unitpost	Resend
Marketing email	Campaigns, segments, and topics on every plan; unlimited contacts on paid	A separate Marketing product priced by contact count on top of transactional volume
Contact pricing	Unlimited contacts on paid plans	Marketing plans priced by number of contacts stored
Visual template editor	Drag-and-drop builder and code mode over one document, round-tripped through the same schema	Code-first (React Email); no drag-and-drop builder
SDK languages	Node.js, Python, Ruby, PHP, Laravel, Go, Java, Rust, .NET	Node, Python, Ruby, Go, PHP, Elixir, and more
Ecosystem maturity	New — fewer tutorials, integrations, and community answers	In production since 2023 with a large community and many integrations
API rate limit	10 requests/second per workspace	5 requests/second per team
Idempotency keys	Idempotency-Key on sends, 24-hour dedupe window	Supported — 24h window, the behaviour we matched
Inbound email	Receiving on verified domains with a read API for messages and attachments	Not offered
SMTP relay	smtp.unitpost.com, API key as password, STARTTLS and implicit TLS	Offered
MCP server for AI agents	Hosted MCP server, one tool per API operation, scoped by API key	Not offered
SMS	On every paid plan: the same contacts, API key, webhooks, and monthly sending allowance as email, at a published per-country rate	Not offered. Resend is email only
Idempotency keys on send	Idempotency-Key on sends, 24-hour dedupe window	—
Webhook secret rotation without dropped deliveries	svix-compatible HMAC-SHA256 with a 24-hour dual-signing rotation grace	Rotation replaces the secret immediately
Hybrid template editing	Visual drag-and-drop and React/TSX code mode over one shared document — the same @unitpost/email library renders both	Varies
One-key import from Resend	Migration Assistant moves contacts, segments, topics, templates, domains, suppressions, and webhooks in about 4 minutes with a read-only key	n/a

How do I migrate from Resend?

Paste a read-only Resend API key into the Migration Assistant and it previews everything that would carry over — contacts, segments, topics, templates, domains, suppressions, and webhooks. Nothing is written until you accept, and Resend keeps sending the whole time, so there is no downtime. It takes about four minutes.

Two things do not carry over: sending domains must re-verify with freshly generated DKIM keys, and webhook signing secrets are regenerated. Dynamic segments import as a static snapshot of their members.

See how migration works

Frequently asked questions

Is Unitpost a drop-in replacement for Resend?

Close, but verify before you switch. We deliberately match Resend's API conventions — Bearer keys, snake_case fields, prefixed object IDs, cursor pagination, the Idempotency-Key header, and an embedded display name in the from field — because they set the standard. The Migration Assistant moves contacts, segments, topics, templates, domains, suppressions, and webhooks with a read-only key. Domains must re-verify with fresh DKIM keys, and webhook signing secrets are regenerated.

Why would I leave Resend?

Almost always because you started sending marketing email too. Resend prices Marketing separately by contact count, so a team doing both transactional and campaigns pays on two axes and maintains two mental models of who their contacts are. Unitpost includes marketing on every paid plan with unlimited contacts, so one bill and one contact list cover both.

Is Resend still the better choice for some teams?

Yes. If you need an Elixir SDK, Resend ships one and we don't. If you only send transactional email, their focus is an advantage rather than a limitation. And their ecosystem is far larger — more tutorials, more integrations, more community answers when you get stuck.

Do you support React Email?

We ship our own component library, @unitpost/email, which works standalone on npm with no account. It is the same library that powers both our visual builder and our code mode, so a template edited by a designer in the builder and a template written in TSX are the same document. If your templates are already in React Email, they are ordinary React components and the migration is mostly mechanical, but it is not a zero-effort import.

Switching from Resend?

Try it on the free tier first

5,000 emails a month free. Verify a domain, send a test, preview the migration.

Start for free Explore the docs