head to head · open source
reaction vs yas
reaction has 12,400 GitHub stars, 2,169 forks, 96 open issues and last shipped 8 months ago. yas has 1,988 stars, 735 forks, 156 open issues and last shipped 5 months ago. reaction leads on adoption by 524% (12,400 vs 1,988 stars). reaction is written in JavaScript under GPL-3.0; yas is written in Java under MIT. reaction has attracted 17% 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 | ⑂ 735 |
| 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) Open Commerce Website Twitter Documentation Discord Discussions Mailchimp Open Commerce is an API first, headless commerce platform built using Node.js, MongoDB, and GraphQL. It plays nicely with npm, Docker and Kubernetes. Features Fast Returns data in split seconds, and faster queries mean faster web pages Proven Open Commerce fuels sites doing 10's of thousands of orders per day with 100's of thousands of products Composable A flexible plugin system allows you to pick and choose which integrations work best for you Multi tenant Host multiple shops in the…
read the full reaction overview →
About yas
YAS: Yet Another Shop YAS is a pet project aim to practice building a typical microservice application in Java Tentative technologies and frameworks Java 25 Spring Boot 4.0 Testcontainers Next.js Keycloak Kafka Elasticsearch K8s GitHub Actions SonarCloud OpenTelemetry Grafana, Loki, Prometheus, Tempo Local development architecture Getting started with Docker Compose 1. Get the latest source code 2. Add the following records to your host file: 3. Open terminal of your choice, go to yas directory, run docker compose up , wait for all the containers up and running Warning: To run all the containers, you need a…
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Frequently asked questions
Is reaction or yas more popular?
reaction has 12,400 GitHub stars and yas has 1,988. 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 (12,400 stars) or its GPL-3.0 licence terms. Choose yas if its feature set, stack or MIT licence fits better. Both are self-hostable.