Key points
- Zigbee runs on IEEE 802.15.4. A coordinator forms the network, and a hub or gateway usually connects it to apps and IP networks. Phones can onboard and control devices over Bluetooth LE with Zigbee Direct, built into Zigbee 4.0.
- Bluetooth Mesh runs on Bluetooth LE. Messages spread by managed flooding, no central controller is required, and phones provision and control devices directly through proxy nodes.
- Both encrypt and authenticate all traffic and work with no internet connection.
- Zigbee also offers sub-GHz radios for longer range. Bluetooth Mesh 1.1 added directed forwarding, remote provisioning and firmware updates over the mesh.
Zigbee vs Bluetooth Mesh comparison table
| Zigbee | Bluetooth Mesh | |
|---|---|---|
| Governed by | Connectivity Standards Alliance | Bluetooth SIG |
| Radio | IEEE 802.15.4 at 2.4 GHz; sub-GHz (Suzi) | Bluetooth Low Energy |
| How messages travel | Routed mesh through routers | Managed flooding, plus directed forwarding since Mesh Protocol 1.1 |
| Central controller | A coordinator forms the network; a hub usually connects it to IP | Not required |
| Phones | Through a hub, or directly with Zigbee Direct over Bluetooth LE | Directly, through GATT proxy nodes; usually the provisioner |
| Battery devices | Sleeping end devices; sleepy-to-sleepy communication in Zigbee 4.0 | Low Power nodes that rely on Friend nodes |
| Security | AES-128 encryption and authentication, certificates, elliptic-curve cryptography | Mandatory; separate network, application and device keys |
| Works without internet | Yes | Yes |
| Membership to certify (October 2026) | Adopter $7,500 a year; certification $2,000 to $3,000 per product | Adopter $0; paid tiers above; qualification required |
Zigbee routing vs Bluetooth Mesh flooding
Zigbee routes messages. Routers in the mesh relay messages for each other and for sleeping end devices, and a coordinator forms the network. The Connectivity Standards Alliance (CSA) describes networks of hundreds of nodes, with coordinators that can be linked for larger ones. How does Zigbee work? covers the roles.
Bluetooth Mesh floods. The Bluetooth SIG describes managed flooding as reliable, multi-path messaging over multiple hops, limited by a time-to-live value that caps the number of hops. Mesh Protocol 1.1, summarised by the SIG in September 2023, added directed forwarding, which sets up collections of relay nodes to carry messages from a source to a destination instead of flooding the whole network. How does Bluetooth Mesh work? covers the details.
Hub requirements for Zigbee and Bluetooth Mesh
Zigbee usually uses a hub. The CSA describes Zigbee reaching IP networks through bridging built into hubs, gateways and controllers, which is also where most installations pair devices and run automations. Zigbee Direct reduces this: with Zigbee 4.0, the CSA says users can onboard and control devices over Bluetooth LE without a hub.
Bluetooth Mesh does not need one. The Bluetooth SIG says control systems based on Bluetooth Mesh do not require centralised controllers, and that installation and operation need no internet or cloud platform. A gateway is still needed if the system should be reachable from outside the building.
Phone control of Zigbee and Bluetooth Mesh
Bluetooth Mesh was designed around phones. The SIG’s developer introduction says proxy nodes expose a GATT interface that ordinary Bluetooth LE devices can use to interact with the mesh, and that the provisioner, which adds new devices, is typically a tablet or smartphone. The SIG adds that installers use commissioning apps that talk directly to nodes.
Zigbee reaches phones through Zigbee Direct, which the CSA describes as simplifying onboarding and control of Zigbee devices directly from Bluetooth LE devices. Without it, the phone talks to a hub.
Zigbee and Bluetooth Mesh security
Zigbee and Bluetooth Mesh both encrypt and authenticate traffic. The Bluetooth SIG’s introduction states that all mesh messages are encrypted and authenticated, that security cannot be turned off, and that network, application and device security are handled with separate keys. Mesh Protocol 1.1 added certificate-based provisioning with X.509 certificates.
The CSA says Zigbee uses AES-128 message encryption and authentication, certificates, out-of-band authentication and elliptic-curve cryptography. Zigbee 4.0 added cryptographic agility and other security updates.
Choosing a mesh for lighting and sensors
- Choose Bluetooth Mesh for commercial lighting and building control commissioned from phones and tablets, where no hub should be required and firmware updates should run over the network.
- Choose Zigbee for products that must work with existing Zigbee hubs and the large installed base the CSA cites, or that need sub-GHz range.
- Consider Matter if the product is for the smart home and should be controllable from Apple, Google, Amazon and SmartThings. Matter runs over Wi-Fi, Thread or Ethernet, and reaches Zigbee and other non-Matter devices only through bridges. Matter vs Thread explains the layers.
Offline Protocol alongside Zigbee and Bluetooth Mesh
Zigbee and Bluetooth Mesh connect fixed devices such as lights and sensors. Offline Protocol connects apps. It is an SDK that lets phones, computers and gateways form their own routed mesh over ordinary Bluetooth LE connections, the local network or a relay, verify each other’s identity, and exchange encrypted messages, shared documents and service calls. It is not an implementation of Bluetooth Mesh and does not join Zigbee networks. Is a phone mesh over BLE the same as Bluetooth Mesh? explains the difference.