head to head · open source
reaction vs ach
reaction has 12,400 GitHub stars, 2,169 forks, 96 open issues and last shipped 8 months ago. ach has 570 stars, 214 forks, 17 open issues and last shipped yesterday. reaction leads on adoption by 2,075% (12,400 vs 570 stars). reaction is written in JavaScript under GPL-3.0; ach is written in Go under Apache-2.0. reaction has attracted 17% as many forks as stars, ach 38%. ach 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
| reaction | ach | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 570 |
| License | GPL-3.0 | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-03-01 | 2026-11-02 |
| Forks | ⑂ 2.2K | ⑂ 214 |
| 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 ach if
- You want the ach feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and ach 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 ach
Project Documentation · API Endpoints · API Guide · Community · Blog moov io/ach Moov's mission is to give developers an easy way to create and integrate bank processing into their own software products. Our open source projects are each focused on solving a single responsibility in financial services and designed around performance, scalability, and ease of use. ACH implements a reader, writer, and validator for Automated Clearing House (ACH) files following the Nacha standards. ACH is the primary method of electronic money movement throughout the United States. The HTTP server is available in a Docker image…
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Frequently asked questions
Is reaction or ach more popular?
reaction has 12,400 GitHub stars and ach has 570. reaction has the larger community by that measure.
Are reaction and ach free?
Both are open source. reaction is licensed under GPL-3.0 and ach under Apache-2.0. Neither carries a licence fee.
What is the difference between reaction and ach?
reaction is written in JavaScript and ach in Go. 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 ach?
Choose reaction if you want the larger community (12,400 stars) or its GPL-3.0 licence terms. Choose ach if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.