ESPHome vs Zwave-JS Server
A side-by-side comparison of two self-hosted home automation options — licensing, setup difficulty, resource needs, and what each one replaces.
ESPHome
Configure ESP devices with simple YAML
VS
Zwave-JS Server
Small server wrapping the Z-Wave JS driver over WebSocket
| Feature | ESPHome | Zwave-JS Server |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 93 · Excellent | 74 · Good |
| Category | Home Automation | Home Automation |
| License | GPL-3.0 | Apache-2.0 |
| Language | C++ | TypeScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 128 MB |
| Deployment | docker, bare-metal | docker, binary |
| GitHub stars | ★ 11,722 | ★ 164 |
| First released | 2018 | 2021 |
| Replaces | SmartThings | SmartThings |
What are ESPHome and Zwave-JS Server?
ESPHome
ESPHome is a system to create custom firmware for ESP32 and ESP8266 microcontrollers using simple YAML configuration. It targets makers building DIY smart home sensors and devices. It is deployed via Docker or as a Home Assistant add-on.
- YAML-defined device firmware
- Tight Home Assistant integration
- Over-the-air updates
- Huge component library
Zwave-JS Server
Z-Wave JS Server is a small server that exposes the Z-Wave JS driver over a WebSocket API. It allows multiple clients, such as Home Assistant, to control a Z-Wave network simultaneously.
- WebSocket Z-Wave API
- Multi-client support
- Built on Z-Wave JS
- Lightweight server
ESPHome vs Zwave-JS Server: key differences
ESPHome is written in C++, while Zwave-JS Server is built with TypeScript. Licensing differs — GPL-3.0 for ESPHome versus Apache-2.0 for Zwave-JS Server. Zwave-JS Server is the lighter option, starting around 128 MB of RAM against 512 MB for ESPHome. ESPHome is the more established project (first released 2018), while Zwave-JS Server arrived in 2021. ESPHome has the considerably larger community, at 11,722 GitHub stars versus 164.
Why pick each one
Choose ESPHome if…
- No coding needed for devices
- Great with Home Assistant
- OTA updates
Watch out for
- Hardware-focused
- Requires ESP microcontrollers
Choose Zwave-JS Server if…
- Decouples driver from clients
- Reliable
Watch out for
- Headless, no UI
- Z-Wave only
Frequently asked questions
Is ESPHome or Zwave-JS Server better?
Neither is universally better. ESPHome has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are ESPHome and Zwave-JS Server free and open-source?
Yes. ESPHome is licensed under GPL-3.0 and Zwave-JS Server under Apache-2.0. Both can be self-hosted at no software cost.
Can I run ESPHome and Zwave-JS Server with Docker?
ESPHome: yes. Zwave-JS Server: yes.
Which is lighter on resources, ESPHome or Zwave-JS Server?
Zwave-JS Server has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for ESPHome. Real-world usage depends on library size, user count, and enabled features.