head to head · open source
reaction vs ach
reaction has 12,399 GitHub stars, 2,176 forks, 96 open issues and last shipped 7 months ago. ach has 564 stars, 203 forks, 17 open issues and last shipped yesterday. reaction leads on adoption by 2,098% (12,399 vs 564 stars). reaction is written in JavaScript under GPL-3.0; ach is written in Go under Apache-2.0. reaction has attracted 18% as many forks as stars, ach 36%. 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 | ★ 564 |
| License | GPL-3.0 | Apache-2.0 |
| Written in | JavaScript | Go |
| Last push | 2026-03-01 | 2026-09-17 |
| Forks | ⑂ 2.2K | ⑂ 203 |
| 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, 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 ach
ACH is an Apache 2.0 Go library and HTTP service from Moov that reads, writes, and validates Automated Clearing House (ACH) files against the Nacha standards, built for developers who need to generate or parse ACH files inside their own payment software.
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Frequently asked questions
Is reaction or ach more popular?
reaction has 12,399 GitHub stars and ach has 564. 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 (12,399 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.