Bluetooth (BLE) tags and cellular trackers are the two ways a shipment reports its own temperature and location without a person checking it by hand. A BLE tag broadcasts short range radio bursts that a gateway or handheld reader picks up and forwards to the cloud. A cellular tracker carries its own SIM and radio modem, so it reports directly to a network tower the way a phone does, with no reader standing nearby. Both attach a temperature data logger function to the tag; the difference is entirely in how the reading gets off the shipment and onto a dashboard.
Neither is inherently the better choice. Each is built for a different kind of lane, and picking the wrong one produces gaps in the record that look identical to an actual excursion when someone reviews the data later.
Range and infrastructure
BLE has a working range measured in tens of meters, sometimes reaching further outdoors with a clear line of sight, and it needs infrastructure on the receiving end: a gateway plugged in at a dock door, mounted in a truck cab, or carried by a warehouse worker with a phone app. Cellular trackers use whatever network coverage already exists along the route, the same towers a phone connects to, and need nothing installed at the facility. A distribution center with gateways at every door can track a pallet the moment it rolls in; a facility with no gateway sees nothing from a BLE tag until it happens to pass a reader.
Gateway dependence and blind spots
The BLE model puts the burden on the receiving side, not the shipment. A warehouse, port, or hospital loading dock without a gateway is a blind spot no matter how good the tag is, and a tag sitting in a truck cab with the gateway switched off might as well not be reporting. Cellular removes that dependency, at the cost of its own blind spot: a cellular tracker goes quiet the moment the shipment enters a location with no signal, a below deck container hold, an underground facility, or a rural stretch with no tower nearby. Both blind spots produce the same symptom, a gap in the record, but they trace to opposite causes.
Battery life and reporting frequency
A BLE tag's radio only has to reach a gateway a few meters away, so it draws very little power, and a single coin cell can run it for a long haul route or several reuse cycles. A cellular modem has to reach a tower that might be kilometers away, and that extra transmit power is the main reason cellular trackers need larger batteries and shorter service intervals between charges or replacements. Reporting frequency follows the same trade-off: a BLE tag can log constantly and burst the backlog to a gateway in seconds, while a cellular tracker balances how often it wakes the modem against how long the battery has to last for the whole route.
Cost per unit
A BLE tag is a simple radio and sensor with no cellular modem or SIM, so the hardware is inexpensive and often disposable at the end of a shipment. A cellular tracker carries a modem, a SIM or embedded SIM profile, and usually a data plan billed on top of the hardware, which pushes the per unit cost well above a BLE tag before a single shipment has moved. That gap is why BLE tags turn up on high volume, lower value freight and cellular trackers turn up on lower volume, high value freight where losing visibility for even one leg is not acceptable.
Fitting the tracker to the lane
BLE fits closed networks: a single distribution operation, a hospital campus, a port with gateways already installed at every gate, or any route where the same operator controls both ends. Cellular fits open, multi-party routes: international air freight, multi-carrier trucking, or last mile delivery to addresses nobody has instrumented. A shipment passing through several handlers who have never installed a gateway needs cellular, or it will arrive with no real-time temperature monitoring at all, just a logger read once at the destination.
Pharmaceutical distributors, contract logistics operators, and hospital receiving teams are the main users of both formats. Which one a given operation deploys usually says more about how many facilities it controls than about which technology performs better on a bench test. A shipment moving inside one company's own sites, where gateways already sit at every relevant door, gets the same visibility from BLE at a fraction of the running cost, and does not need a cellular data plan to prove what a tag and a receiver already prove more cheaply.