When is Plunk the better choice?

You only need low-volume transactional email and want the simplest possible bill as you grow. You want a hosted free tier with unlimited contacts and are okay with Plunk branding on outgoing mail. You expect to send just a few thousand emails a month and prefer paying only for what you send. You may self-host later and want an email platform that can also run via Docker Compose.

When is Resend the better choice?

You need a richer free developer email stack with REST API, SMTP, official SDKs, React Email, webhooks, and scheduled sends. You care about free access to automation runs, batch sending, tracking, and one custom domain. You want a paid plan that bundles higher email quotas and support rather than pure per-email billing. You are likely to use receiving/inbound email and want that available in the same product.

Plunk vs Resend: Free Tier Comparison

Q: How much does Plunk cost after the free tier?

Pay as you grow - $0.001 / email. Plunk’s paid path is usage-based at $0.001 per email, so costs rise directly with sends and there is no fixed monthly floor in the data provided. Resend starts at $20/mo for 50,000 emails, with extra emails at $0.90 per 1,000, so it is a tiered, usage-based model with a meaningful monthly minimum. That means Plunk is cheaper at very low volume, while Resend becomes easier to budget once you are already near tens of thousands of emails and want the paid feature bundle. For the concrete volume points below, Plunk stays cheaper per send, but Resend includes a lot more at its base plan.

Q: How much does Resend cost after the free tier?

Pro - $20 / mo. Plunk’s paid path is usage-based at $0.001 per email, so costs rise directly with sends and there is no fixed monthly floor in the data provided. Resend starts at $20/mo for 50,000 emails, with extra emails at $0.90 per 1,000, so it is a tiered, usage-based model with a meaningful monthly minimum. That means Plunk is cheaper at very low volume, while Resend becomes easier to budget once you are already near tens of thousands of emails and want the paid feature bundle. For the concrete volume points below, Plunk stays cheaper per send, but Resend includes a lot more at its base plan.

Quick answer

Resend - Resend wins for most builders because its free tier is broader for product email workflows, while Plunk is the better pick if you want a simpler free hosted send-only setup with a much cheaper pay-as-you-go path once you exceed the cap.

How the free tiers compare

These free tiers solve different problems. Plunk’s free plan is narrower but simpler: 1,000 emails a month, unlimited contacts, branding on emails, and a clean usage-based upgrade at $0.001 per email. That makes it attractive if you expect light volume and want costs to rise only with sends. Resend’s free tier is more generous on paper for builders who need API access, SMTP, scheduled sends, batch sending, tracking, webhooks, automation runs, and a custom domain, but it also has a stricter daily cap and a higher jump to paid plans. After free, Resend moves to a seatless usage-based plan with included email quotas and overage pricing, while Plunk stays purely per-email. In short, Plunk is cheaper to scale from tiny volume, but Resend gives more free product surface area.

Plunk vs Resend free tier, side by side

	PlunkFTV 46	ResendFTV 30
Free email quotaResend also limits free sending to 100 emails per day.	1,000 emails / month	3,000 emails / month
Daily sending limitThis can matter if you send in bursts.	Not specified	100 emails / day
Custom domainsPlunk mentions custom domains with DKIM/SPF/DMARC setup.	Not specified in the free tier items	1 custom domain
Automation runsResend names a hard quota; Plunk describes automation features but does not give a run limit.	Workflow automation included	10,000 runs
Data retentionOnly Resend gives a retention figure in the input.	Not specified	30 days
Branding on emailsPlunk’s free tier explicitly includes branding.	Plunk branding on emails	Not specified

After you outgrow the free tier

Plunk’s paid path is usage-based at $0.001 per email, so costs rise directly with sends and there is no fixed monthly floor in the data provided. Resend starts at $20/mo for 50,000 emails, with extra emails at $0.90 per 1,000, so it is a tiered, usage-based model with a meaningful monthly minimum. That means Plunk is cheaper at very low volume, while Resend becomes easier to budget once you are already near tens of thousands of emails and want the paid feature bundle. For the concrete volume points below, Plunk stays cheaper per send, but Resend includes a lot more at its base plan.

Plunk next stepPay as you grow - $0.001 / emailUsage-based

Resend next stepPro - $20 / moUsage-based

Cost at real usage

Usage	Plunk	Resend
1,000 emails/moResend free tier allows 3,000 emails/mo, but also caps at 100/day.	~$1/mo	Free (within tier)
3,000 emails/moAt 3,000/mo, Resend is still within its free monthly quota, assuming the daily limit is not exceeded.	~$3/mo	Free (within tier)
50,000 emails/moResend Pro includes 50,000 emails/mo; overages are $0.90 / 1,000 after that.	~$50/mo	$20/mo
100,000 emails/moResend Scale is $90/mo for 100,000 emails/mo, but that plan includes the quota; the input also lists $0.90 / 1,000 extra emails, so usage above the included amount would cost more.	~$100/mo	~$65/mo

Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.

When to pick each one

Pick Plunk when…

You only need low-volume transactional email and want the simplest possible bill as you grow.
You want a hosted free tier with unlimited contacts and are okay with Plunk branding on outgoing mail.
You expect to send just a few thousand emails a month and prefer paying only for what you send.
You may self-host later and want an email platform that can also run via Docker Compose.

Pick Resend when…

You need a richer free developer email stack with REST API, SMTP, official SDKs, React Email, webhooks, and scheduled sends.
You care about free access to automation runs, batch sending, tracking, and one custom domain.
You want a paid plan that bundles higher email quotas and support rather than pure per-email billing.
You are likely to use receiving/inbound email and want that available in the same product.

Bottom line

For the most common builder use case, Resend is the better free-tier starting point because it gives you more of the product surface area you are likely to need: API, SMTP, SDKs, scheduled sends, batch sending, tracking, webhooks, and a custom domain. Plunk is the cleaner choice if your main concern is sending a small number of emails as cheaply as possible, since its paid path is direct per-email billing. If you expect to grow slowly and care about cost efficiency first, Plunk wins. If you care about workflow depth and developer ergonomics, Resend wins.

Read the full listings: Plunk and Resend. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.