head to head · open source
reaction vs yas
reaction has 12,399 GitHub stars, 2,176 forks, 96 open issues and last shipped 7 months ago. yas has 1,987 stars, 730 forks, 156 open issues and last shipped 3 months ago. reaction leads on adoption by 524% (12,399 vs 1,987 stars). reaction is written in JavaScript under GPL-3.0; yas is written in Java under MIT. reaction has attracted 18% as many forks as stars, yas 37%. yas was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (docker, ecommerce, hacktoberfest), so they are genuine substitutes rather than adjacent tools.
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
| reaction | yas | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 2.0K |
| License | GPL-3.0 | MIT |
| Written in | JavaScript | Java |
| Last push | 2026-03-01 | 2026-06-12 |
| Forks | ⑂ 2.2K | ⑂ 730 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick reaction if
- You weight community size — 12K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick yas if
- You want the yas feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Java
- You evaluated both and yas fits your workflow better
About reaction
Mailchimp Open Commerce, formerly Reaction Commerce, is an API first, headless commerce platform built on Node.js, MongoDB, and GraphQL for development teams that want to run a custom storefront, marketplace, or multi shop operation on their own infrastructure — and the project has been discontinued.
read the full reaction overview →
About yas
YAS (Yet Another Shop) is a sample microservices e commerce application written in Java, built to practise how a typical microservice system is assembled, and it is aimed at Java and Spring Boot developers who want a realistic multi service codebase to study, run locally, or extend.
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Frequently asked questions
Is reaction or yas more popular?
reaction has 12,399 GitHub stars and yas has 1,987. reaction has the larger community by that measure.
Are reaction and yas free?
Both are open source. reaction is licensed under GPL-3.0 and yas under MIT. Neither carries a licence fee.
What is the difference between reaction and yas?
reaction is written in JavaScript and yas 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, reaction or yas?
Choose reaction if you want the larger community (12,399 stars) or its GPL-3.0 licence terms. Choose yas if its feature set, stack or MIT licence fits better. Both are self-hostable.