Overview
The SONOFF Zigbee Bridge Pro and Bridge Ultra are two advanced smart home hubs that serve as the “heart” of a Zigbee network. These compact devices connect your Zigbee sensors, switches, and other sub-devices to your home network and enable control via smartphone apps or voice assistants. In practice, the Bridge Pro and Ultra let homeowners and tech enthusiasts build large, reliable smart-home systems. Both support Zigbee 3.0 and integrate with the eWeLink app, but the Ultra adds new capabilities (like Matter compatibility and wired Ethernet) for even greater flexibility and device support. Below we explore each hub’s features separately, then compare them.
SONOFF Zigbee Bridge Pro
The SONOFF Zigbee Bridge Pro (model ZBBridge-P) is a streamlined Zigbee 3.0 hub designed for most home automation needs. It can manage up to 128 Zigbee sub-devices, vastly expanding your network beyond the old 32-device limit. The Bridge Pro bridges Zigbee and 2.4 GHz Wi-Fi devices, allowing seamless communication across protocols. For security, it offers custom Home/Away/Sleep modes: you can assign sensors (motion, door/window, etc.) to trigger each mode, and the hub can act as a local alarm center. Importantly, Bridge Pro executes local scenes and schedules on-device even if the Internet goes down, thanks to its built-in real-time clock. It supports voice control through Alexa and Google Assistant, so you can operate Zigbee lights or plugs hands-free via the cloud. Overall, the Bridge Pro delivers a stable, fully integrated smart home backbone in a small (62×62×20 mm, 35 g) package.
Key features of the Bridge Pro include:
128-device Capacity: Supports up to 128 Zigbee devices (the hub directly links up to 26 devices – 10 battery-powered end devices + 16 mains-powered routers – and achieves 128 by adding routers).
Smart Home Security: Provides custom arming modes (Home, Away, Sleep) and functions as a local alarm hub.
Local Automation: Scenes and schedules run locally. Even if Wi-Fi or Internet fails, automated actions based on Zigbee sensor triggers continue uninterrupted.
Dual-Protocol Bridge: Connects Zigbee devices to your Wi-Fi network, enabling cross-protocol automation (e.g. Zigbee sensors triggering Wi-Fi lights).
Wide Compatibility: Works with SONOFF’s Zigbee devices (smart switches, plugs, motion sensors, etc.), allowing you to build linkages (e.g. motion-triggered lights or temperature-controlled fans).
Voice Control: Compatible with Amazon Alexa and Google Assistant for voice operation of connected Zigbee devices.
Together, these features make the Zigbee Bridge Pro an ideal hub for typical smart homes, offering robust capacity and reliable local control for devices like lights, door sensors, motion detectors, and climate sensors.
SONOFF Zigbee Bridge Ultra
The SONOFF Zigbee Bridge Ultra (model ZBBridge-U) is a high-performance Zigbee 3.0 hub that expands on the Pro’s capabilities. Most notably, it supports up to 256 Zigbee sub-devices, double the Pro’s capacity. The Ultra uses a powerful EFR32MG21 chip with a 1.5 GHz dual-core CPU, 1 GB DDR4 RAM and 8 GB flash storage. This beefier hardware ensures smooth performance and even enables OTA firmware updates of connected sub-devices. The Ultra can operate as a Zigbee-to-Matter bridge: when placed on the same LAN as a Matter hub, it exposes your Zigbee devices to Alexa, Google Home, Apple HomeKit (Matter) and other ecosystems. In practice, this means you can control SONOFF Zigbee devices through HomeKit or other Matter-compatible platforms without extra adapters.
Other enhancements on the Ultra include:
Wired Ethernet: In addition to 2.4 GHz Wi-Fi, it has a Gigabit Ethernet RJ45 port for a stable network backhaul. This is useful in large installations where Wi-Fi might be unreliable.
Extended Range: With a “Turbo Mode,” the Ultra can reach up to ~200 m in open space, providing stronger Zigbee coverage for sprawling homes.
Large Device Support: With 256-device capacity, it can handle complex networks (e.g. whole-home lighting, multi-floor sensors).
Smart Home Security: It also acts as an alarm. For example, you can set a scene where tapping an NFC tag or pressing a paired wireless button instantly arms the system. The hub will sound a buzzer and push a notification when tripped.
Voice & Smart Assistants: Because of its Matter bridge, all Zigbee devices can be controlled via Alexa, Google Assistant, Siri (via HomeKit) and other assistants.
In summary, the Bridge Ultra is a “pro” version of the Zigbee hub. Its more powerful CPU/RAM, Ethernet port, and Matter interoperability make it suited for large or future-proof smart homes – especially if you want to include Apple HomeKit or mix in some non-SONOFF devices via Matter. (Note: SONOFF’s docs say the Ultra supports only SONOFF/eWeLink Zigbee devices, but its Matter bridge allows those devices to appear in any Matter-compatible smart home, including Apple’s ecosystem.)
Comparing Bridge Pro vs. Bridge Ultra
Both hubs share common functions (Zigbee 3.0 support, local scene execution, eWeLink app control), but the Ultra adds key upgrades. Here are the main differences:
Capacity: Bridge Pro supports up to 128 Zigbee devices. Bridge Ultra supports up to 256 Zigbee devices, making it better for very large networks or future expansion.
Network Connectivity: Both hubs connect to 2.4 GHz Wi-Fi, but Ultra adds a wired Ethernet port for more reliable LAN connectivity (useful for streaming large home data or when Wi-Fi is spotty).
Smart Home Ecosystem: Pro works with the eWeLink app and exposes devices to Alexa/Google via the eWeLink cloud. Ultra acts as a Matter bridge, which means your Zigbee devices also show up in Matter platforms (Apple HomeKit, Google Home, SmartThings, etc.). In effect, Bridge Ultra extends device compatibility to ecosystems that use the Matter standard.
Hardware Performance: The Ultra’s internal specs (1.5 GHz dual-core CPU, 1 GB RAM) are significantly higher-end. This means it can handle more devices and more complex automation simultaneously. The Bridge Pro has simpler hardware (no specification given, but implied to be less powerful) yet still handles up to 128 devices smoothly.
Local Scenes & Security: Both run scenes locally without Internet. Pro offers Home/Away/Sleep modes and can trigger sirens from sensors. Ultra offers all that and adds “one-tap defense” via NFC or button (quickly arm the system). Both can be central alarm hubs.
Use Case: In practice, the Bridge Pro is ideal for a typical smart home: controlling lights, plugs, and sensors of a family-sized house. It provides a stable and scalable Zigbee backbone for most DIY or professional installations. The Bridge Ultra, with its higher device limit and Matter functionality, is aimed at larger or cutting-edge setups. For example, a tech-savvy integrator might use it to unify Zigbee devices with Apple HomeKit or a commercial IoT deployment that needs wired LAN connectivity.
In short, choose the Zigbee Bridge Pro if you need a reliable Zigbee hub for standard home automation. If you plan to connect hundreds of sensors/switches, require Ethernet backhaul, or want full Matter/HomeKit integration, the Zigbee Bridge Ultra offers the extra horsepower and features you need. Each device’s specifications and feature set are summarized below:
Zigbee Bridge Pro: Up to 128 Zigbee devices, dual Zigbee/Wi-Fi support, customizable security modes (Home/Away/Sleep), local scene execution, Alexa/Google integration.
Zigbee Bridge Ultra: Up to 256 Zigbee devices, Ethernet + Wi-Fi, built-in Matter bridge (Apple HomeKit/Alexa/Google), powerful CPU/RAM, NFC one-tap alarm mode, extended Zigbee range, OTA device updates.
Both hubs greatly expand the size and reliability of a SONOFF smart home network – the choice depends on scale and ecosystem needs.