# Compare email APIs

Side-by-side comparisons of Retransmit, Resend, useSend, Plunk, and eusend. Pricing, features, deliverability, and self-hosting, checked against each vendor's own pages.

- [Best Resend alternatives in 2026](https://retransmit.dev/compare/resend-alternatives): Four Resend alternatives compared on price, features, and self-hosting: Retransmit, useSend, Plunk, and eusend. Includes a full pricing table checked on September 1, 2026.
- [Open source email API comparison](https://retransmit.dev/compare/open-source-email-api): Retransmit, useSend, and Plunk are open source email platforms you can self-host. This comparison covers licenses, cloud pricing, features, and what self-hosting actually takes.
- [Retransmit vs Resend](https://retransmit.dev/compare/retransmit-vs-resend): Retransmit and Resend compared: pricing models, sending features, webhooks, deliverability, and self-hosting. An honest table of what each does that the other does not.
- [Retransmit vs useSend](https://retransmit.dev/compare/retransmit-vs-usesend): Retransmit and useSend are both open source email platforms built on Amazon SES. This comparison covers pricing, marketing features, SDKs, webhooks, and self-hosting.
- [Retransmit vs Plunk](https://retransmit.dev/compare/retransmit-vs-plunk): Retransmit and Plunk compared: transactional focus vs all-in-one marketing, pricing per thousand emails, webhooks, automations, and what self-hosting looks like for each.
- [Retransmit vs eusend](https://retransmit.dev/compare/retransmit-vs-eusend): Retransmit and eusend compared: prepaid credits vs EU-metered plans, batch sending, webhooks, SDKs, and data residency. Both are transactional-first email APIs.

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Canonical: https://retransmit.dev/compare

Agent resources: [llms.txt](https://retransmit.dev/llms.txt) | [sitemap](https://retransmit.dev/sitemap.xml) | [OpenAPI spec](https://retransmit.dev/openapi.json) | [docs](https://docs.retransmit.dev)