Resend alternatives · Email Sending
Open-source alternatives to Resend
Resend is not described as open source on its own site. 8 of the 50 other email sending services in this directory are open source, according to their own sites.
Resend has a free plan. Paid plans start at $20 per month for 50,000 emails, billed monthly. All of them are free or have a free plan.
8 tools · Listings checked up to Nov 13, 2026 · Where the facts come from
How each one differs from Resend
- Free plan · from $10/mo
useSend
Open-source email sender built on Amazon SES
- useSend starts at $10 per month, then pay as you go. Resend starts at $20 per month for 50,000 emails, billed monthly.
- useSend is open source and self-hostable, according to its own site.
- Free plan · from $0.001
Plunk
Open-source email platform for transactional and marketing mail
- Plunk starts at $0.001 per email sent. Resend starts at $20 per month for 50,000 emails, billed monthly.
- Plunk is open source and self-hostable, according to its own site.
- Plunk also covers workflow automation.
- Free plan · from €10,000/yr
Hyvor Relay
Open-source email API you can self-host
- Hyvor Relay starts at €10,000 per year and up (Enterprise License). Resend starts at $20 per month for 50,000 emails, billed monthly.
- Hyvor Relay is open source and self-hostable, according to its own site.
- Resend also covers email campaigns.
- Free plan · from $30/mo
Novu
Open-source notification infrastructure for apps and agents
- Novu starts at $30 per month for 30,000 workflow runs. Resend starts at $20 per month for 50,000 emails, billed monthly.
- Novu is open source, according to its own site.
- Novu also covers workflow automation.
- Resend also covers email campaigns.
- Free
Nodemailer
Free Node.js library for sending email over SMTP and other transports
- Nodemailer is free. Resend starts at $20 per month for 50,000 emails, billed monthly.
- Nodemailer is open source, according to its own site.
- Resend also covers email campaigns.
- Free plan · from $5,000/yr
KumoMTA
Open-source mail server for high-volume, self-run email sending
- KumoMTA starts at $5,000 per billion messages per year for Silver support. Resend starts at $20 per month for 50,000 emails, billed monthly.
- Only KumoMTA lists a Linux app.
- Only Resend lists a web app.
- KumoMTA is open source and self-hostable, according to its own site.
- Free plan · from $3/mo
Forward Email
Open-source email forwarding and hosting for custom domains
- Forward Email starts at $3 per month for unlimited domains. Resend starts at $20 per month for 50,000 emails, billed monthly.
- Only Forward Email lists macOS, Windows, Linux, iOS and Android apps.
- Forward Email is open source and self-hostable, according to its own site.
- Resend also covers email campaigns and transactional email.
- Free
FluentSMTP
Free WordPress plugin for sending site email through your provider
- FluentSMTP is free. Resend starts at $20 per month for 50,000 emails, billed monthly.
- FluentSMTP is open source, according to its own site.
- FluentSMTP also covers reports.
- Resend also covers email campaigns.
Common questions
Is there an open-source alternative to Resend?
Yes. useSend, Plunk, Hyvor Relay, Novu, Nodemailer, KumoMTA, Forward Email and FluentSMTP are open source, according to their own sites.
Is Resend open source?
Resend is not described as open source on its own site. The listing was checked on Oct 18, 2026 against the pages it cites.
When was this checked?
Each listing shows its own date. On this page they run from Oct 18, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Resend: the alternatives its listing names first, then the tools that share the most features with it.