head to head · open source
Hoppscotch vs greenmail
Hoppscotch has 80,331 GitHub stars, 6,110 forks, 820 open issues and last shipped 2 days ago. greenmail has 744 stars, 204 forks, 67 open issues and last shipped yesterday. Hoppscotch leads on adoption by 10,697% (80,331 vs 744 stars). Hoppscotch is written in TypeScript under MIT; greenmail is written in Java under Apache-2.0. Hoppscotch has attracted 8% as many forks as stars, greenmail 27%. greenmail 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.
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Side by side
| Hoppscotch | greenmail | |
|---|---|---|
| GitHub stars | ★ 80K | ★ 744 |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 6.1K | ⑂ 204 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Hoppscotch if
- You weight community size — 80K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick greenmail if
- You want the greenmail feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and greenmail fits your workflow better
About Hoppscotch
Hoppscotch is an open source API development ecosystem that provides a full featured client for designing, testing, and documenting APIs. It operates as a web based application, desktop app, and CLI tool, supporting offline, on premises, and cloud deployments. Built with TypeScript and licensed under MIT, it serves as a direct open source alternative to proprietary tools like Postman and Insomnia.
read the full Hoppscotch overview →
About greenmail
GreenMail is a Java project that provides a virtual mail server for testing email based applications, services, and systems. It is Apache 2.0 licensed, published through Maven Central as com.icegreen:greenmail, and listed in Developer Tools / API Development & Testing.
read the full greenmail overview →
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Frequently asked questions
Is Hoppscotch or greenmail more popular?
Hoppscotch has 80,331 GitHub stars and greenmail has 744. Hoppscotch has the larger community by that measure.
Are Hoppscotch and greenmail free?
Both are open source. Hoppscotch is licensed under MIT and greenmail under Apache-2.0. Neither carries a licence fee.
What is the difference between Hoppscotch and greenmail?
Hoppscotch is written in TypeScript and greenmail in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Hoppscotch or greenmail?
Choose Hoppscotch if you want the larger community (80,331 stars) or its MIT licence terms. Choose greenmail if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.