How many devices can a smart home hub handle?

The three ceilings every hub has#

1. The hard cap. The database or account limit: the most the system will accept. Nothing you do on the network changes it.
2. The radio cap. How many devices can talk to the hub's radio directly, without a repeater in between. On a mesh such as Zigbee this is not a total. Devices beyond it attach to a mains-powered router instead of the hub, so the fix is more routers, not a bigger hub.
3. The recommendation. The figure a vendor says keeps the system responsive. It sits below the hard cap, and going past it is allowed but slows things down.

Most vendors publish one of the three. Philips publishes the first and third on one page, which is why Hue owners quote two numbers for one bridge.

Every published limit, side by side#

As of October 2026. "None published" means the vendor's own documentation, which was checked, gives no figure.

Philips Hue: 50 is the advice, 63 is the wall#

Philips' own page on how many bridges you need gives the original Hue Bridge "50 lights (hard limit 63)" and 12 accessories, meaning switches and sensors, a recommendation a house with a dimmer in every room reaches before the light count. For the Bridge Pro it gives "150+ lights (hard limit 186)" and 50+ accessories. Philips explains why the two numbers differ: the official limits "exist to maintain fast, stable communication", and overloading a bridge "can cause slower response times or unresponsive lights."

So both circulating answers are Philips figures: the bridge accepts 63 lights and handles 50 well. The 150 often attached to "the Hue Bridge" is the Bridge Pro's recommendation, not the original bridge's limit.

Philips' answer past the limit is a second bridge, with one cost it states plainly: some functions, "like automations and certain voice assistant controls, remain limited to devices on a single Bridge." Split by floor or by building, so each bridge's automations stay local to it. The Bridge Pro also changes how Hue reaches Apple Home, which smart lighting that stays compatible covers, and exposing Hue lights to other ecosystems through a Matter bridge costs features whichever bridge you own.

Lutron Caseta: 75, and your remotes count#

Lutron's Caseta FAQ refers to "the Caséta system's 75-device limit", and its Smart Hub page says the hub controls Caseta devices "up to 75 per hub". The useful detail is in Lutron's specification submittal for the Smart Bridge and Smart Bridge PRO (document 369816), which lists what counts: "Caséta Wireless dimmers, plug-in dimmers, and switches, Pico remote controls, wireless shades", and adds that the bridge itself "counts as one device." Lutron's Smart Hub page lists fan controls and sensors among the devices it controls.

That changes the arithmetic. A 40 switch house with 20 Picos and 10 shades is at 71, hub included, before a single sensor.

What does not count: Lutron's FAQ says the Claro smart accessory switch "does not count towards the 75-count device" limit. If you are close to the limit, that is a way to add a companion location to a three-way circuit without spending a slot. Separately, Lutron allows up to 10 Picos paired to each dimmer or switch.

Two older figures cause the confusion. The limit used to be 50: Lutron announced in June 2019 that it was "expanding the device limit from 50 to 75 devices" through an app update, so forum posts from before mid-2019 quote 50. Another version claims 50 for the standard bridge and 75 for the PRO, but Lutron's submittal gives 75 for both.

The other limit on that spec sheet is distance: "All devices must be located within 30 ft (9 m)" of the bridge. Caseta's radio is Lutron's proprietary Clear Connect, so a large house can run out of range before it runs out of slots. Wiring considerations for the switches themselves are in smart switches and dimmers.

SmartThings: 300 per location, and the 32 that is not a total#

Samsung's own SmartThings page states: "The maximum number of devices that can be connected to SmartThings is 300 per location", with up to 10 locations per account, 20 rooms per location, and 20 members per account. Samsung adds that the real maximum "may be limited depending on the user's network environment." That is a platform cap. It applies to the whole location, not to one hub's radio.

The 32 figure that fills the SmartThings Community comes from a 2017 thread about the Hub V2, in which a contributor wrote that the hub "currently only supports 32 directly connected end devices", and that "routers don't count against the 32 end device limit and you can add as many routers as you want/need." It is a community figure for one hardware generation and a radio cap, not a total. Samsung has not published an equivalent figure for the Station or the Aeotec hubs. The SmartThings platform page covers which hub hardware is current.

Hubitat: 32 direct, then repeaters#

Hubitat's documentation states its radio cap plainly: "Hubitat Elevation can support up to 32 end devices (devices connected directly to the hub without the help of a repeating device). Beyond 32 battery powered or non-repeating end devices, you must add mains powered repeating devices." Battery devices never repeat, so the 33rd battery sensor needs a mains-powered device between it and the hub.

Hubitat publishes no total device count. The Hubitat platform page has the hardware details, and the Z-Wave side follows the protocol's own figures: 232 nodes on a classic mesh and up to 4,000 on Long Range, covered in Z-Wave and Z-Wave Long Range.

Aqara Hub M3: 127 is Aqara's number#

Aqara's own product page says the Hub M3 can "integrate up to 127 Thread/Zigbee devices." That is the figure to plan against, and it is a combined total across both radios.

Two other numbers circulate. Vesternet, a reseller, says the M3 "can connect up to 128 Zigbee devices directly", and other pages give 64 direct and 127 through routers. Neither appears in Aqara's M3 user manual, whose specification table lists no device count at all, so treat 127 as the whole hub and any direct figure as unconfirmed.

Amazon Echo and Apple Home: none published#

Amazon's developer page on Zigbee support lists the Echo and eero models with a built-in Zigbee hub, from the Echo 4th gen and Echo Hub to the eero Pro 7, and gives no figure for how many devices any of them supports. The Amazon Alexa platform page covers which Echo is a hub.

Apple publishes no per-home device limit for Apple Home either. The one documented figure on the Apple side applies to bridges presenting devices into Apple Home: Home Assistant's documentation notes that "the HomeKit Accessory Protocol Specification only allows a maximum of 150 unique accessories (aid) per bridge". That is a per-bridge ceiling, not a home ceiling.

Which ceiling stops you first#

Work through these in order and stop at the first one you hit.

Where these numbers stop applying#

These are the limits of the vendor hub, not the protocol. A Zigbee network is not limited to 32 devices; one hub's direct connections are. A Thread network has its own ceiling of 32 active routers whatever hub forms it. And a bridge that presents devices to another platform, such as a HomeKit bridge, has its own ceiling on top of the hub's.

Firmware can also move these figures. Lutron raised Caseta from 50 to 75 with an app update, and Philips' accessory guidance uses "12" for one bridge and "50+" for the other without a firm wall. Where a hub has no published figure, the honest test is response time: if commands start arriving late after you add devices, that is your limit. Hubs compared by the radios they carry has the radio side of the same buying decision.