Plunk — open-source Marketing Automation

Updated 2026-09-03 · tool · Marketing Automation · rev 1 · structured JSON

OSS alt to Resend; ~5347 stars; via openalternative.co

• Open source: yes (AGPL-3.0)
• Self-hostable: yes
• Pricing model: usage
• Best for: Organizations seeking an open-source alternative to email platforms like SendGrid, Resend, or Mailgun for transactional emails, campaigns, and automation.
• Last verified: 2026-09-04

Is Plunk open source?

Yes, Plunk is open source under the AGPL-3.0 license.

How much does Plunk cost?

Plunk uses usage-based pricing. The open-source version can be self-hosted with no license cost; you pay only for your own infrastructure.

Can I self-host Plunk?

Yes, Plunk can be self-hosted (the source is available under the AGPL-3.0 license).

• Source: github · github.com/useplunk
• Repository: https://github.com/useplunk/plunk

See other open-source Resend alternatives.

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