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Best open-source form backends

Verified June 2026

If you need full control, self-hostable form backends let you run the endpoint on your own infrastructure. The trade-off is ops overhead.

  1. 1

    Formspree (OSS fork / libre)

    Some community forks of Formspree's older codebase exist.

    Formspree (OSS fork / libre) alternative
  2. 2

    FormLoom MCP + SDK

    The MCP server and @formloom/client SDK are MIT open source — the hosted backend is SaaS.

  3. 3

    Netlify Functions DIY

    Roll your own email handler with Netlify Functions and Resend — full control, but you wire everything.

How we ranked these

  • Open source license
  • Self-hostable
  • Ops burden
  • Feature parity with SaaS

FAQ

The MCP server (@formloom/mcp) and typed SDK (@formloom/client) are MIT open source. The hosted backend is closed-source SaaS.

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Best open-source form backends (2026) — honest, ranked comparison · FormLoom