head to head · open source
nats-server vs SIP.js
nats-server has 20,989 GitHub stars, 2,025 forks, 472 open issues and last shipped yesterday. SIP.js has 2,104 stars, 724 forks, 97 open issues and last shipped 5 months ago. nats-server leads on adoption by 898% (20,989 vs 2,104 stars). nats-server is written in Go under Apache-2.0; SIP.js is written in TypeScript under MIT. nats-server has attracted 10% as many forks as stars, SIP.js 34%. 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.
← all 20902 open source comparisons
Side by side
| nats-server | SIP.js | |
|---|---|---|
| GitHub stars | ★ 21K | ★ 2.1K |
| License | Apache-2.0 | MIT |
| Written in | Go | TypeScript |
| Last push | 2026-11-02 | 2026-06-15 |
| Forks | ⑂ 2.0K | ⑂ 724 |
| 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 SIP.js if
- You want the SIP.js feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and SIP.js fits your workflow better
About nats-server
NATS is a simple, secure and performant communications system for digital systems, services and devices. NATS is part of the Cloud Native Computing Foundation (CNCF). NATS has over 40 client language implementations, and its server can run on premise, in the cloud, at the edge, and even on a Raspberry Pi. NATS can secure and simplify design and operation of modern distributed systems. [![License][License Image]][License Url] [![Build][Build Status Image]][Build Status Url] [![Release][Release Image]][Release Url] [![Slack][Slack Image]][Slack Url] [![Coverage][Coverage Image]][Coverage Url] [![Docker…
read the full nats-server overview →
About SIP.js
SIP Library for JavaScript Create real time peer to peer audio and video sessions via WebRTC Utilize SIP in your web application via SIP over WebSocket Send instant messages and view presence Support early media, hold and transfers Send DTMF RFC 2833 or SIP INFO Share your screen or desktop Written in TypeScript Runs in all major web browsers Compatible with standards compliant servers including Asterisk and FreeSWITCH Demo Want see it in action? The project website, sipjs.com, has a live demo. Looking for code to get started with? This repository includes demonstrations which run in a web browser. Usage To…
read the full SIP.js overview →
More in Infrastructure & Operations
Related comparisons
More Messaging & Event Streaming projects
Compare either of these against the rest of the Messaging & Event Streaming field.
Frequently asked questions
Is nats-server or SIP.js more popular?
nats-server has 20,989 GitHub stars and SIP.js has 2,104. nats-server has the larger community by that measure.
Are nats-server and SIP.js free?
Both are open source. nats-server is licensed under Apache-2.0 and SIP.js under MIT. Neither carries a licence fee.
What is the difference between nats-server and SIP.js?
nats-server is written in Go and SIP.js in TypeScript. 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 SIP.js?
Choose nats-server if you want the larger community (20,989 stars) or its Apache-2.0 licence terms. Choose SIP.js if its feature set, stack or MIT licence fits better. Both are self-hostable.