The open source email platform for everyone.
useSend positions itself as an open-source platform for product, transactional, and marketing email, with a hosted option and self-hosting.
useSend is an email-delivery platform that its site presents as an open-source alternative to Resend, SendGrid, Mailgun, and Postmark. Its documentation covers adding a sending domain, creating an API key, using its API or SMTP, and self-hosting.
Teams that want transactional and marketing email with an option to self-host and build through an API or SMTP relay.
Teams that need a vendor-managed enterprise email program with published support, compliance, uptime, or pricing commitments should look elsewhere: the retrieved material only presents a free tier and self-hosting, while the pricing and support endpoints were unavailable.
No curated rival set covers this tool yet, so these are simply other tools in the same architectural layer and product form. Treat it as a starting point, not a shortlist.
Yes. The site describes product, transactional, and marketing email, with campaigns, contact lists, and consent management.
Yes. The site says it is open source and can be self-hosted; its documentation includes local-development guidance.
Yes. The docs list SMTP support as an alternative to the REST API.
Yes. The retrieved OpenAPI 3.0 specification documents domain, campaign, contact, and email operations.
The getting-started documentation says to add a domain and generate an API key.
This page tells you whether useSend fits. Cheetah builds and runs the system it goes into — enrichment, sequencing, CRM and the joins between them.
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