{"data":{"slug":"plunk","name":"Plunk","tagline":"AGPL-3.0 transactional email, workflows, and broadcasts","category":"comms","categoryName":"Comms","url":"https://www.useplunk.com","github":"https://github.com/useplunk/plunk","pricing":"freemium","hook":"Plunk is Resend plus campaigns, if you can live with AGPL and a branded footer.","whatsGood":"AGPL-3.0. Transactional, workflow automation, and broadcasts in one. Hosted Free is 1,000 emails/month, no credit card. Self-host with Docker Compose. Unlimited contacts on the pricing page.","theCatch":"AGPL-3.0 is copyleft. Hosted Free keeps Plunk branding. This is not Resend at volume — 1k/mo is the free wall, then $0.001/email. Self-host means you bring SES or equivalent.","verdict":"AGPL email with a real 1k hosted free tier. Branding stays until you pay.","addedAt":"2026-09-03","featured":false,"domain":"Comms","subSpecialty":"Email","capabilities":["email"],"surfaces":["Self-host","Hosted"],"ecosystem":["Node.js"],"licenseModel":"Freemium","githubStars":5421},"related":[{"slug":"livekit","name":"LiveKit","tagline":"Apache-2.0 realtime rooms, SFU, and agents"},{"slug":"chatwoot","name":"Chatwoot","tagline":"MIT-core support inbox you can self-host for $0/agent"},{"slug":"socket-io","name":"Socket.IO","tagline":"MIT realtime library with fallbacks, not a hosted product"},{"slug":"centrifugo","name":"Centrifugo","tagline":"Apache-2.0 Go realtime server binary, not in-process Socket.IO"},{"slug":"liveblocks","name":"Liveblocks","tagline":"Hosted collab rooms; Free $0 pauses at the cap"}],"links":{"self":"/api/gems/plunk","html":"/gems/plunk","markdown":"/gems/plunk.md","category":"/api/gems?category=comms","categoryPage":"/stacks/comms"}}