head to head · open source
Plunk vs Hyvor Relay
Plunk has 5,573 GitHub stars, 429 forks, 61 open issues and last shipped 2 days ago. Hyvor Relay has 920 stars, 65 forks, 56 open issues and last shipped yesterday. Plunk leads on adoption by 506% (5,573 vs 920 stars). Plunk is written in TypeScript under AGPL-3.0; Hyvor Relay is written in PHP under AGPL-3.0. Plunk has attracted 8% as many forks as stars, Hyvor Relay 7%. Hyvor Relay was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 20902 open source comparisons
Side by side
| Plunk | Hyvor Relay | |
|---|---|---|
| GitHub stars | ★ 5.6K | ★ 920 |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | TypeScript | PHP |
| Last push | 2026-11-01 | 2026-11-02 |
| Forks | ⑂ 429 | ⑂ 65 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Plunk if
- You weight community size — 5.6K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Hyvor Relay if
- You want the Hyvor Relay feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches PHP
- You evaluated both and Hyvor Relay fits your workflow better
About Plunk
Plunk The Open Source Email Platform Introduction Transactional emails, marketing campaigns, and workflow automation — in one platform. Self hostable, $0.001 per email, no contact limits. An open source, self hosted alternative to tools SendGrid, Resend or Mailgun. Features Transactional Emails : Send emails straight from your API with template support and variable substitution SMTP : Use Plunk as an SMTP relay to send emails from any existing tool or framework Campaigns : Send newsletters and product updates to large audiences Workflows : Create advanced automations with triggers, delays, and conditional logic…
read the full Plunk overview →
About Hyvor Relay
Hyvor Relay Hyvor Relay is a self hosted, open source email API for developers. It uses SMTP to send emails using your own infrastructure. It is designed to be simple to self host, easy to manage and observe, and powerful enough to send millions of daily emails. Email API for Developers Self Hosting Docs Product Docs Features Self Hosted : Docker compose or swarm based deployment. Health Checks : Multiple health checks to ensure best performance and deliverability. Email API : Send emails using a simple API. Logs & SMTP Conversations : View send logs and SMTP conversations of sent emails up to 30 days. Multi…
read the full Hyvor Relay overview →
More in Productivity & Utilities
Related comparisons
More Email & Communication projects
Compare either of these against the rest of the Email & Communication field.
Frequently asked questions
Is Plunk or Hyvor Relay more popular?
Plunk has 5,573 GitHub stars and Hyvor Relay has 920. Plunk has the larger community by that measure.
Are Plunk and Hyvor Relay free?
Both are open source. Plunk is licensed under AGPL-3.0 and Hyvor Relay under AGPL-3.0. Neither carries a licence fee.
What is the difference between Plunk and Hyvor Relay?
Plunk is written in TypeScript and Hyvor Relay in PHP. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Plunk or Hyvor Relay?
Choose Plunk if you want the larger community (5,573 stars) or its AGPL-3.0 licence terms. Choose Hyvor Relay if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.