openHAB vs Gladys: Which to Self-Host?
Quick Verdict
openHAB is the better choice for users building complex, multi-protocol smart homes who want a structured, maintainable architecture. Gladys Assistant is better for users who want a simple, privacy-focused platform with a modern UI and don’t need openHAB’s depth. They serve fundamentally different complexity levels.
Overview
openHAB is a Java-based home automation platform backed by the openHAB Foundation. It uses a formal thing-channel-item architecture with 450+ bindings. It’s designed for large, complex installations and offers both text-based and UI-based configuration.
Gladys Assistant is a Node.js-based platform focused on simplicity and privacy. It bundles ~30 curated integrations with a polished UI. Built primarily by a single developer with community support, it targets users who want automation without the learning curve of enterprise-grade platforms.
Feature Comparison
| Feature | openHAB | Gladys Assistant |
|---|---|---|
| Language | Java (OSGi) | Node.js |
| Bindings/integrations | 450+ | ~30 curated |
| Configuration | Text files + UI | UI-only |
| Automation | Rules DSL, JavaScript, Blockly | Visual scene builder |
| Architecture | Thing → Channel → Item (typed) | Device → Feature (simple) |
| Mobile app | Official iOS + Android | PWA |
| MQTT | Native binding | Built-in |
| Zigbee | ZHA, Zigbee2MQTT | Zigbee2MQTT |
| Z-Wave | Z-Wave JS | Z-Wave JS UI |
| KNX | Native binding | No |
| Docker support | Official image | Official image |
| RAM usage | 500 MB–1 GB | 200–400 MB |
| Persistence | InfluxDB, RRD4J, JDBC | SQLite |
| CalDAV | Via binding | Built-in |
Installation Complexity
openHAB has a significant learning curve. The thing-channel-item model is powerful but requires understanding before you can configure anything. Documentation is comprehensive but dense. Expect hours before your first device is properly integrated.
Gladys is designed to be set up in minutes. The setup wizard walks you through integration pairing. Adding a Zigbee device is: install Zigbee2MQTT, pair device, it appears in Gladys. No items, channels, or bindings to define.
The complexity gap between these two is one of the largest in the home automation space.
Performance and Resource Usage
openHAB’s JVM requires 500 MB minimum, with 1 GB recommended for installations with many bindings. Startup takes 30–60 seconds. The Java runtime is resource-hungry but handles large device counts efficiently once loaded.
Gladys runs comfortably on 200–400 MB. Its Node.js runtime starts in seconds. For the same hardware, Gladys leaves more resources available for other applications.
Community and Support
openHAB has a large, well-organized community with a structured forum, comprehensive documentation, and professional governance. Support is reliable and thorough.
Gladys has a smaller community, primarily French and English. Documentation is clear but covers less ground (fewer integrations to document). The single-developer model means consistent quality but slower feature development.
Use Cases
Choose openHAB If…
- You manage 50+ devices across multiple protocols
- You want text-based configuration with version control
- You need KNX, EnOcean, or other specialized protocols
- You prefer a platform with formal governance and long-term stability guarantees
- You want a native mobile app with persistence and charting
Choose Gladys Assistant If…
- You have a small-to-medium smart home (under 50 devices)
- You want the simplest possible setup experience
- Privacy is your primary motivation for self-hosting
- You don’t need hundreds of integrations
- You prefer a modern web UI over configuration files
Final Verdict
These platforms target different users entirely. openHAB is for people who want to build and maintain a sophisticated automation system. Gladys is for people who want their lights to turn on when they get home.
If you’re reading this comparison because you’re overwhelmed by Home Assistant and want something simpler, Gladys is your answer. If you’re looking at openHAB because Home Assistant doesn’t offer enough structure, openHAB delivers that in spades.
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