head to head · open source
nats-server vs Operational
nats-server has 20,745 GitHub stars, 1,962 forks, 472 open issues and last shipped yesterday. Operational has 477 stars, 17 forks, 9 open issues and last shipped 2 months ago. nats-server leads on adoption by 4,249% (20,745 vs 477 stars). nats-server is written in Go under Apache-2.0; Operational is written in Vue under AGPL-3.0. nats-server has attracted 9% as many forks as stars, Operational 4%. nats-server 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
| nats-server | Operational | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 477 |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Go | Vue |
| Last push | 2026-09-18 | 2026-07-26 |
| Forks | ⑂ 2.0K | ⑂ 17 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick nats-server if
- You weight community size — 21K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick Operational if
- You want the Operational feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Vue
- You evaluated both and Operational fits your workflow better
About nats-server
nats server is the Go based, Apache 2.0 licensed server at the heart of NATS, a simple, secure and performant communications system for digital systems, services and devices, aimed at teams building distributed systems, microservices, and cloud, edge or connected vehicle deployments that need messaging without running heavyweight broker infrastructure.
read the full nats-server overview →
About Operational
Operational is an open source event tracking and notification tool for technology products. It lives in the Node.js ecosystem and is distributed as a monorepo containing a Vue 3 single page application, an Express backend, an Astro marketing website, and a shared packages folder published to npm. The runtime stack is Node.js 18 or newer, MySQL 8.x, and Prisma as the data layer, with ClickHouse supported as an optional addition. The project is licensed under AGPL 3.0 and its topics list places it in the self hosted, SaaS, PWA, and push notification space.
read the full Operational overview →
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Frequently asked questions
Is nats-server or Operational more popular?
nats-server has 20,745 GitHub stars and Operational has 477. nats-server has the larger community by that measure.
Are nats-server and Operational free?
Both are open source. nats-server is licensed under Apache-2.0 and Operational under AGPL-3.0. Neither carries a licence fee.
What is the difference between nats-server and Operational?
nats-server is written in Go and Operational in Vue. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, nats-server or Operational?
Choose nats-server if you want the larger community (20,745 stars) or its Apache-2.0 licence terms. Choose Operational if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.