Resend vs Postmark vs SendGrid Pricing 2026 Compared

Resend, Postmark, and SendGrid are the three transactional email APIs a founder shortlists when a product needs to send password resets, receipts, and notifications in 2026. Their prices are not comparable on a single number, because each prices a different volume band differently and one of them removed its free plan entirely. This article verifies the free tiers, the paid entry plans, and computes the cost per thousand emails so you can see which wins at your send volume.

1. Free tiers: Resend still gives one away

The free-tier picture changed in 2025. Verified against each provider's pricing as of May 25, 2026.

Provider	Free tier	Permanent?
Resend	3,000 emails/mo, 100/day[1]	Yes, permanent
Postmark	100 emails/mo[2]	Yes, permanent (no overages)
SendGrid	60-day trial, 100/day[3]	No, free plan retired[4]

Resend's permanent 3,000-emails-per-month free tier is the most generous of the three and is enough to run a small product's transactional email at zero cost. Postmark's permanent free plan is a token 100 emails per month, useful only for testing. SendGrid no longer has a permanent free plan at all: Twilio retired the free Email API plan in 2025, so new accounts get a 60-day trial and must then move to a paid plan^[4]. For a bootstrapped product where staying free matters, Resend is the only one of the three that supports it at any meaningful volume.

2. Paid entry tiers compared

Entry paid plans verified against each provider's pricing as of May 25, 2026.

Provider	Entry paid	Included volume	Overage
Postmark Basic	$15/mo[2]	10,000/mo[2]	$1.80/1,000[2]
SendGrid Essentials	from $19.95/mo[3]	50,000/mo[3]	Tiered by plan[3]
Resend Pro	$20/mo[1]	50,000/mo[1]	~$0.90/1,000 at this tier[1]

Postmark Basic is the cheapest entry at $15/month, but it includes only 10,000 emails. Resend Pro at $20/month and SendGrid Essentials at $19.95/month both include 50,000 emails, five times Postmark's allowance for $5 more. So the $15 vs $20 sticker is misleading: at 10,000 emails Postmark is cheapest, but at 50,000 emails Postmark would cost $15 plus 40 × $1.80 = $87/month in overage, far above Resend's or SendGrid's flat $20. The included volume, not the base price, decides the winner.

3. Cost per thousand emails

Normalizing to cost per thousand emails at the entry plan's included volume makes the comparison direct:

• Postmark Basic: $15 for 10,000 = $1.50 per thousand at the included level, then $1.80 per additional thousand.
• Resend Pro: $20 for 50,000 = $0.40 per thousand at the included level.
• SendGrid Essentials: $19.95 for 50,000 = $0.40 per thousand at the included level.

At their respective entry plans, Resend and SendGrid both deliver email at about $0.40 per thousand, while Postmark's effective rate is $1.50 per thousand because its plan is sized for a tenth of the volume. Postmark's per-email price is higher by design; it positions on deliverability and a focused transactional product rather than on volume economics. If your only metric is cost per email at scale, Resend and SendGrid are roughly four times cheaper per message at 50,000/month. Roll the chosen email line into your full monthly stack with the AI stack cost calculator.

4. Where each wins by volume

The cheapest provider flips across three volume bands:

Monthly volume	Cheapest	Why
Under 3,000	Resend (free)[1]	Permanent free tier covers it at $0
Around 10,000	Postmark Basic ($15)[2]	Plan sized exactly for this band
Around 50,000	Resend / SendGrid (~$20)[1][3]	Flat $20 beats Postmark's overage

Below 3,000 emails a month, Resend's free tier makes it the only zero-cost option. Around 10,000 emails, Postmark Basic at $15 is the cheapest paid plan because it is sized for exactly that band. Around 50,000 emails, Resend Pro and SendGrid Essentials at roughly $20 win decisively because Postmark at that volume would run about $87/month on overage. The practical takeaway: pick the provider whose entry plan is sized to your actual monthly volume, and re-check when your volume crosses a band boundary.

5. Decision guidance

• Under 3,000 emails/month: Resend, free. The only permanent free tier with meaningful volume.
• Around 10,000 emails/month: Postmark Basic at $15. Cheapest plan sized for that band.
• Around 50,000 emails/month: Resend Pro or SendGrid Essentials at roughly $20. Both far cheaper than Postmark's overage.
• Need a permanent free tier: Resend or Postmark only. SendGrid retired its free Email API plan.
• Deliverability-focused transactional only: Postmark, accepting the higher per-email price for its focused product.

Re-verify each pricing page before committing; email pricing and free-tier policies change, as SendGrid's free-plan removal shows. For the full early-stage tooling picture, see the 2026 AI solopreneur stack and the month-one solo SaaS stack cost.

All pricing figures verified against official pricing pages as of 2026-05-25.

Frequently asked questions

Which email API is cheapest in 2026: Resend, Postmark, or SendGrid?

For low volume, Resend is cheapest because its free plan sends 3,000 emails a month at no cost, verified on Resend's pricing as of May 2026. For paid volume around 50,000 emails a month, Resend Pro at $20 and SendGrid Essentials at $19.95 are nearly tied and both beat scaling Postmark's $15 Basic plan with per-thousand overage. Postmark's $15 Basic plan includes 10,000 emails, so it is cheapest only if your volume stays near that level. The answer depends entirely on your monthly send volume.

Does SendGrid still have a free plan in 2026?

No. Twilio retired SendGrid's free Email API and free Marketing Campaigns plan in 2025. New SendGrid accounts get a 60-day free trial sending up to 100 emails per day, after which a paid plan is required to keep sending. Resend, by contrast, still offers a permanent free tier of 3,000 emails per month, and Postmark offers a permanent free plan of 100 emails per month. If a permanent free tier matters, SendGrid no longer competes on that axis.

How do the paid entry plans compare?

Postmark Basic is $15 per month for 10,000 emails with $1.80 per additional thousand. Resend Pro is $20 per month for 50,000 emails. SendGrid Essentials starts at $19.95 per month for 50,000 emails. So for around 50,000 emails a month, Resend and SendGrid are nearly tied near $20 and both include five times the volume of Postmark's $15 entry plan. Postmark only wins on price if your volume stays close to 10,000 emails a month.