How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Postmark is the best pick for deliverability-first transactional email, with promotional and transactional streams kept separate.
- MailerSend and Mailtrap offer the most generous free tiers for small apps, with 500 and 1,000 free emails per month respectively.
- Amazon SES is the cheapest option at high volume, but it needs more setup and AWS familiarity than the developer-first tools here.
- Brevo is the pick if you want transactional email plus marketing campaigns, SMS, and CRM in one platform.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Postmark | Teams that put inbox delivery first | $15/month | Free trial |
 Mailgun | Developers who need sending plus validation and optimization | See website | Free trial |
 SendGrid | Apps sending at very large scale | See website | Free trial |
 Amazon SES | AWS teams that want the lowest per-email cost | See website | Limited free tier |
 Mailtrap | Teams that test email before sending it live | See website | Yes |
 MailerSend | Small apps and side projects on a budget | $7/month | Yes |
 Loops | SaaS teams that send marketing and transactional mail together | See website | Yes |
 Brevo | Teams that want email, SMS, and CRM in one platform | $9/month | Yes |
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The best resend alternatives
#1Postmark
Best for: Teams that put inbox delivery first4.6/5 on
G2 (32 reviews, checked Oct 2026)
Visit postmarkapp.com
Starting price$15/month
Free planFree trial
Postmark has sent transactional email since 2010, and its reputation rests on one idea: transactional messages should never wait behind a newsletter blast. Promotional and transactional mail run on separate streams, so a password reset does not queue behind a marketing campaign. Setup takes minutes with official libraries for Python, Ruby, PHP, .NET, and JavaScript, and support carries a 95 percent customer happiness rating.
The trade is scope. Postmark is deliberately narrow, with no full marketing suite, and there is no permanent free tier, only a trial. For teams whose core need is password resets, receipts, and notifications landing in the inbox fast, Postmark is the safest Resend alternative here.
What we like- Strong deliverability reputation
- Promotional and transactional streams run on separate infrastructure
- Fast setup with libraries for major languages
Watch out for- No permanent free tier
- Marketing features are limited by design
- Pricing scales with volume
#2Mailgun
Best for: Developers who need sending plus validation and optimization4.2/5 on
G2 (322 reviews, checked Oct 2026)
Visit mailgun.com
Starting priceSee website
Free planFree trial
Mailgun is the veteran of this list, built by developers for developers, with send, optimize, validate, and inspect tools under one roof. Its validation API removes dead addresses before you send, its optimization suite tracks engagement and spam-folder placement, and its email preview tools catch rendering problems early. That breadth suits teams that want one vendor for the whole sending pipeline.
The homepage does not show current pricing, so the starting price is listed as "See website" rather than a guessed figure. Smaller teams may find the platform more than they need. For growing apps that want validation and analytics alongside sending, Mailgun is a strong, proven choice.
What we like- Mature API and SMTP options
- Email validation and deliverability tools included
- Scales from thousands to millions of emails
Watch out for- Pricing is not shown on the homepage, so check the pricing page
- Dashboard can feel busy for small teams
- Free tier is trial-only
Starting priceSee website
Free planFree trial
SendGrid is the scale pick. Now part of Twilio, it delivers more than 200 billion emails per month, and its Email API and SMTP service are trusted by large senders worldwide. Marketing campaigns sit alongside the API, so teams can run newsletters and transactional mail from one account, and Twilio's platform adds verification, alerts, and messaging options around it.
Pricing is not shown on the homepage, so check Twilio's current SendGrid pricing before committing. The platform can feel heavy for a side project. For apps that expect to grow into serious volume, SendGrid's track record at scale is hard to argue with.
What we like- Proven at over 200 billion emails per month
- Email API plus marketing campaigns
- Now backed by Twilio's wider platform
Watch out for- Pricing is not shown on the homepage
- The Twilio move adds navigation complexity
- Small senders may prefer a simpler tool
#4Amazon SES
Best for: AWS teams that want the lowest per-email cost4.3/5 on
G2 (205 reviews, checked Oct 2026)
Visit aws.amazon.com
Starting priceSee website
Free planLimited free tier
Amazon SES is the budget champion for high volume. You pay only for what you use, and the service transacts more than a trillion emails a year for customers including Netflix and Duolingo. Deliverability tools, IP management, and Mail Manager for incoming mail give serious senders real control, and dedicated IPs are available when reputation isolation matters.
The cost of that power is complexity. SES lives inside AWS, so setup, domain verification, and sending limits need AWS familiarity, and there is no friendly campaign builder. Teams already on AWS, or sending millions of emails a month, will save real money. Everyone else should weigh the setup effort first.
What we like- Pay-as-you-go pricing
- Handles more than a trillion emails a year
- Trusted by Netflix and Duolingo
- Dedicated and shared IP options
Watch out for- Setup is more involved than developer-first APIs
- No polished marketing UI
- Support costs extra through AWS plans
#5Mailtrap
Best for: Teams that test email before sending it live4.8/5 on
G2 (77 reviews, checked Oct 2026)
Visit mailtrap.io
Starting priceSee website
Free planYes
Mailtrap started as the developer's answer to a painful problem: testing email in staging without spamming real users. Its fake SMTP inboxes catch test mail safely, and the same account now handles production sending with analytics, open and click tracking, and 30-day email logs. More than 150,000 monthly active users rely on it, and support comes from engineers and deliverability experts around the clock.
Pricing is not shown on the homepage, and a free sending tier covers small volumes. Teams that only need live sending may not use the testing side. For teams that want staging safety plus production delivery in one place, Mailtrap is the most developer-friendly option here.
What we like- Fake SMTP inboxes for safe staging tests
- Production sending in the same account
- Strong analytics and 24/7 expert support
Watch out for- Pricing is not shown on the homepage
- Testing features may be overkill for teams that only send live
- Smaller brand than SendGrid
#6MailerSend
Best for: Small apps and side projects on a budget4.1/5 on
G2 (46 reviews, checked Oct 2026)
Visit mailersend.com
Starting price$7/month
Free planYes
MailerSend is the friendliest pick for small projects. The free tier includes 500 emails per month, templates, a drag-and-drop builder, and email threads, while the Hobby plan starts at $7 per month for 5,000 emails and the Starter plan at $28 per month for 50,000. Setup takes minutes through API or SMTP, and the dashboard tracks delivery, bounces, and suppressions clearly.
The free tier is small, so growing apps will move to a paid plan quickly, and the wider messaging features cost extra. For a side project, a startup, or a small SaaS app that wants clean tooling without enterprise pricing, MailerSend is the best value in this list.
What we like- Free tier with 500 emails per month
- Clean API and SMTP relay
- 99.5 percent uptime guarantee
- Templates and drag-and-drop builder included
Watch out for- Free tier caps at 500 emails
- SMS and WhatsApp add cost
- Smaller ecosystem than SendGrid
#7
Loops
Best for: SaaS teams that send marketing and transactional mail together
Visit loops.so
Starting priceSee website
Free planYes
Loops positions itself as the modern email platform for SaaS, covering marketing, product, and transactional mail from one account. Its theme system lets teams set colors, type, and spacing once, with every email picking them up automatically, so branding stays consistent without reformatting templates. That design-first approach suits product-led teams that care how their emails look.
Pricing detail on the homepage is thin, so check the pricing page for current plans, and the SaaS focus means it is less suited to general marketing agencies. For a SaaS team that wants product emails and campaigns in one clean tool, Loops is a strong Resend alternative.
What we like- Built for SaaS with marketing and transactional mail in one place
- Theme system keeps branding consistent
- Free tier available
Watch out for- Homepage shows little pricing detail
- Narrower focus than all-in-one platforms
- Smaller community than the big APIs
#8Brevo
Best for: Teams that want email, SMS, and CRM in one platform4.5/5 on
G2 (2,747 reviews, checked Oct 2026)
Visit brevo.com
Starting price$9/month
Free planYes
Brevo is the all-in-one pick. Where the other tools here focus on transactional sending, Brevo combines email marketing, SMS, WhatsApp, CRM, and automation in a single platform trusted by more than 600,000 customers. The Starter plan starts at $9 per month, a free tier covers first sends, and the drag-and-drop editor plus ready-made templates make campaigns fast to launch.
The breadth is also the trade. Transactional email is one feature among many, so API-first teams may find the platform heavier than a dedicated sender. For small businesses that want marketing, sales, and transactional mail managed together, Brevo replaces several tools at once.
What we like- Email plus SMS, WhatsApp, CRM, and automation
- 600,000+ customers
- Free tier included
- Drag-and-drop campaign editor
Watch out for- Transactional API is one part of a large platform
- Advanced features spread across plan tiers
- Less developer-narrow than Postmark
How we chose
We compared each service on deliverability focus, API and SMTP quality, pricing transparency, free tiers, analytics, and scale. Every homepage above was opened to confirm it loads and belongs to the product. Prices come from vendor pages where shown; where the homepage did not display pricing, the field reads "See website" rather than a guessed figure. Resend itself was excluded as the product being replaced.
What to check before you switch
Start with volume. Under a few thousand emails a month, MailerSend's free tier or Mailtrap's free sending covers you. At tens of thousands, compare Postmark's $15 starting plan against MailerSend's $7 Hobby plan and Brevo's $9 Starter plan. At millions, Amazon SES usually wins on cost, with SendGrid as the managed alternative.
Next, separate your streams. If marketing blasts share infrastructure with password resets, a big campaign can delay critical mail. Postmark separates them by design, and the other tools handle it through dedicated domains or subaccounts. Check deliverability tooling too: validation, bounce handling, and suppression lists save inbox placement over time. Finally, test before you commit. Every tool here offers a trial or free tier, so send real test mail through two finalists and compare delivery speed and dashboard clarity before migrating.
Frequently asked questions
Is Resend shutting down?
No. Resend remains an operating service. Teams usually look for alternatives because of pricing, volume limits, feature needs, or a preference for a different vendor, not because Resend has closed.
Which alternative is closest to Resend?
Postmark is the closest in spirit: a developer-first transactional API with a strong deliverability focus. MailerSend is the closest on price for small apps, with a free tier and a $7 starting plan.
What is the cheapest option for high volume?
Amazon SES, with pay-as-you-go pricing that undercuts most managed APIs at millions of emails per month. The trade is setup effort and the lack of a polished marketing UI.
Do any of these offer a free plan?
Yes. MailerSend offers 500 free emails per month, Mailtrap offers free sending for small volumes, Brevo and Loops offer free tiers, and Amazon SES offers a limited free tier. Postmark, Mailgun, and SendGrid offer free trials instead.
Can I send marketing emails through these tools?
Yes, with differences. Brevo and Loops are built for marketing plus transactional mail. Postmark keeps the two streams separate by design. SendGrid, Mailgun, and MailerSend support both, while SES is best paired with another tool for campaign design.
How hard is it to migrate from Resend?
Migration is usually straightforward: verify your domain, swap API keys or SMTP credentials, and update templates. Keep Resend running during a transition week so no mail is lost, and warm up dedicated IPs gradually if you use them.
Sources we checked (8)
- https://postmarkapp.com
- https://www.mailgun.com
- https://sendgrid.com
- https://aws.amazon.com/ses/
- https://mailtrap.io
- https://www.mailersend.com
- https://loops.so
- https://www.brevo.com
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.