head to head · open source
Bruno vs greenmail
Bruno has 47,992 GitHub stars, 3,068 forks, 1,831 open issues and last shipped yesterday. greenmail has 749 stars, 205 forks, 67 open issues and last shipped yesterday. Bruno leads on adoption by 6,307% (47,992 vs 749 stars). Bruno is written in JavaScript under MIT; greenmail is written in Java under Apache-2.0. Bruno has attracted 6% as many forks as stars, greenmail 27%. Bruno 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
| Bruno | greenmail | |
|---|---|---|
| GitHub stars | ★ 48K | ★ 749 |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.1K | ⑂ 205 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Bruno if
- You weight community size — 48K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- 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 Bruno
Bruno Opensource IDE for exploring and testing APIs. English Українська Русский Türkçe Deutsch Français Português (BR) 한국어 বাংলা Español Italiano Română Polski 简体中文 正體中文 العربية 日本語 ქართული Nederlands فارسی Bruno is a new and innovative API client, aimed at revolutionizing the status quo represented by Postman and similar tools out there. Bruno stores your collections directly in a folder on your filesystem. We use a plain text markup language, Bru, to save information about API requests. You can use Git or any version control of your choice to collaborate over your API collections. Bruno is offline only. There…
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About greenmail
GreenMail [ ][docker hub] [GreenMail][greenmail project site] allows developers to test email based applications, services or systems without access to a live mail server. Developers can send, receive, and verify emails by embedding GreenMail in a unit test or running it as a standalone container. GreenMail acts as a virtual (mocking/sandbox) mail server and supports common mail protocols SMTP, IMAP and POP3. [Examples][greenmail examples] [Javadoc][greenmail javadoc] [FAQ][greenmail faq] [Download][greenmail download] [Maven coordinates][maven repository com]: com.icegreen:greenmail:\ The separate GreenMail…
read the full greenmail overview →
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Frequently asked questions
Is Bruno or greenmail more popular?
Bruno has 47,992 GitHub stars and greenmail has 749. Bruno has the larger community by that measure.
Are Bruno and greenmail free?
Both are open source. Bruno is licensed under MIT and greenmail under Apache-2.0. Neither carries a licence fee.
What is the difference between Bruno and greenmail?
Bruno is written in JavaScript 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, Bruno or greenmail?
Choose Bruno if you want the larger community (47,992 stars) or its MIT licence terms. Choose greenmail if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.