BLE vs Wi-Fi vs UWB
The three technologies behind almost every indoor positioning project. They sit at different points on the same curve - accuracy on one axis, cost and coverage on the other. This page maps that curve, so you can find where your use case lands.
Wi-Fi for the widest coverage at the lowest cost, on infrastructure you already own. BLE for the best balance - good accuracy, multi-year tags, site-wide scale - which is why it anchors most RTLS deployments. UWB when centimetres are non-negotiable in a contained zone. In practice, most sites run Wi-Fi and BLE together, and add UWB only where precision pays for itself.
BLE
Best balance of accuracy, battery and scale.Wi-Fi
Broadest coverage, essentially no new hardware.UWB
Highest precision, highest cost per area.What each technology actually does
BLE positioning locates tags, badges and smartphones using low-power Bluetooth signals picked up by beacons or BLE-enabled access points. A location engine computes position to typically 1-5 m, with tags that run for years on a coin cell.
- Accuracy1-5 m
- InfraBeacons + existing APs
- Tags1-5 years
- Wins onBalance
Wi-Fi positioning locates devices using the wireless network already installed across a site. Signal strength to several access points, matched against a radio map, gives position to typically 3-8 m with essentially no new hardware.
- Accuracy3-8 m
- InfraAlready deployed
- TagsShorter life
- Wins onCoverage
UWB positioning measures how long very short radio pulses take to reach fixed anchors. Because it measures time rather than signal strength, it reaches 10-30 cm - but needs dedicated anchor hardware in every area it covers.
- Accuracy10-30 cm
- InfraDedicated anchors
- TagsShorter life
- Wins onPrecision
The principle that connects all three
Precision costs coverage. UWB measures time of flight and gets centimetres, but every zone needs anchors. Wi-Fi rides infrastructure that already blankets your site, but only gets you to a general area. BLE sits between them - accurate enough for the vast majority of use cases, cheap enough to scale everywhere, and frugal enough that tags last years. That middle position is why BLE anchors most RTLS deployments.
BLE vs Wi-Fi vs UWB: the full table
Fourteen criteria across all three. Read the ticks as "has the edge here" rather than "is better overall" - each technology is the right answer for something.
| Criterion | BLE | Wi-Fi | UWB |
|---|---|---|---|
| Typical accuracy | 1-5 m | 3-8 m | 10-30 cm |
| How it measures | Signal strength / AoA | Signal strength / fingerprint | Time of flight |
| Infrastructure needed | Beacons + existing APs | Already installed | Dedicated anchors |
| Infrastructure cost | Low | Lowest | High |
| Tag cost | Low | Higher | Highest |
| Tag battery life | 1-5 years | Shorter | Shorter |
| Site-wide scalability | Strong | Strongest | Zone by zone |
| Speed of deployment | Fast | Fastest | Slowest |
| Smartphone support | Universal | Universal | Newer devices only |
| Tracking non-connected assets | Strong | Limited | Strong |
| Multipath robustness | Moderate | Moderate | Strong |
| Real-time responsiveness | Strong | Network dependent | Strong |
| Maintenance load | Battery cycles | Minimal | Anchors + tags |
| Best suited to | RTLS, assets, safety | Coverage, occupancy | Precision zones |
Four trade-offs that place each technology
Rather than comparing them in pairs, it's clearer to look at the axes they differ on. Where your requirements sit on these four determines the answer almost automatically.
Accuracy: what does your process actually need?
The instinct is to want the tightest number available. The useful question is what changes your decision. "Which room is the pump in" is solved at a few metres; "align this component to the millimetre" is not. Buying precision beyond the requirement is the most common way these projects overrun.
Coverage: how does cost scale with area?
This is where the three separate hardest. Wi-Fi's coverage is already paid for. BLE adds beacons where density demands it - though BLE-enabled Cisco, HPE Aruba and Fortinet access points absorb much of that. UWB's cost scales directly with every square metre you anchor, which is why it's rarely deployed site-wide.
Power: is anything you track on a battery?
If yes, this quietly becomes the deciding factor. BLE tags run for years on a coin cell; Wi-Fi and UWB tags don't. On a fleet of a few thousand assets, that's the difference between a maintenance routine and a maintenance problem.
What you can locate, not just how precisely
Wi-Fi naturally locates what's already on the network. BLE and UWB extend location to anything you can attach a tag to - a trolley, a badge, a pallet. That difference widens the use case set from occupancy analytics to full RTLS, asset tracking and worker safety.
Which technology fits which use case
Filter by a technology to see where it wins, or tap a use case to reveal why. "Best fit" reflects the usual recommendation - your site conditions may shift it.
Use case to technology
Asset tracking across a site
Finding equipment, trolleys and tools quickly, at scale.
Asset tracking ↗Why BLE. Battery tags are cheap enough to put on thousands of assets, and BLE gives room/zone-level accuracy on the network you already run. Wi-Fi can locate but tags are power-hungry; UWB is overkill and costly at this scale.
Why BLE + Wi-Fi. Every phone already listens to both - no wearable required. Beacons anchor the blue dot, Wi-Fi fills coverage. UWB isn't in most phones, so it can't power a mass-market wayfinding app.
Occupancy & space utilization
How many people are in a zone, and how spaces get used.
People counting ↗Why Wi-Fi. It counts devices already connected across large areas with zero extra hardware. BLE refines the picture where you need tighter zones. UWB adds no value for aggregate counting.
Why BLE. A small wearable badge with a long battery is easy to deploy everywhere, including plant rooms and back-of-house where Wi-Fi thins out. UWB infrastructure rarely reaches those remote areas.
Why it depends. BLE handles most entry/exit zones affordably. Wi-Fi works for coarse areas. Where a boundary must be centimetre-tight (a machine cell, a restricted line), UWB earns its place.
Flow analytics & dwell time
Understanding paths, congestion and how long people stay.
Flow analytics ↗Why Wi-Fi + BLE. Wi-Fi sees the broad movement across a whole site; BLE sharpens dwell time in key zones. Together they map paths and congestion without tagging every visitor.
Precision positioning in a cell
Tool placement, robot safety envelopes, calibration bays.
Educational comparison - not a Pole Star product area.
Why UWB. Only UWB delivers reliable centimetre-level accuracy for a robot envelope or tool bay. BLE and Wi-Fi work at room/zone level - too coarse for this job. This is the one clear UWB win.
Site-wide RTLS programme
Real-time location across a full operation, many asset types.
RTLS explained ↗Why a mix. A real programme blends technologies: BLE + Wi-Fi as the site-wide backbone on existing infrastructure, with UWB reserved for the few zones that truly need centimetre precision.
Industries Pole Star serves
Think in layers, not in either/or
Mature deployments rarely pick one. They layer the three so that each covers what the others can't - and pay for precision only where it earns its place.
Wi-Fi - the coverage baseline
Site-wide reach on access points already installed. Nothing new to buy to see where people and connected devices are.
BLE - the precision and asset layer
Better accuracy, multi-year tags, and location for anything taggable. Runs on the same access points, so it's a capability, not a second infrastructure. This is where most RTLS value lives.
UWB - the precision cell, where needed
Deployed only in the specific zones where centimetres change the process. Anchors where it counts, not across the site.
Where Pole Star fits
Pole Star is software-first and hardware-agnostic. NAO Suite runs BLE as the primary technology alongside Wi-Fi on existing Cisco, HPE Aruba and Fortinet infrastructure, orchestrated by one location engine - because that combination covers full sites without a parallel hardware estate. Much of the accuracy comes from the engine itself: filtering, fingerprinting and calibration lift what the same radios deliver. And because the platform is open, location data from other sources can flow into the same systems through the API and SDK.
BLE vs Wi-Fi vs UWB, answered
What is the difference between BLE, Wi-Fi and UWB positioning?
Wi-Fi locates devices using the existing network, typically to 3-8 m. BLE uses low-power Bluetooth from beacons or access points, typically to 1-5 m, with multi-year tags. UWB measures the travel time of radio pulses to dedicated anchors, reaching 10-30 cm.
Which is the most accurate?
UWB, by a wide margin - 10-30 cm against 1-5 m for BLE and 3-8 m for Wi-Fi. But accuracy is only one criterion; UWB requires dedicated anchors in every area it covers.
Which is the cheapest?
Wi-Fi, where the network already exists, since positioning is switched on rather than built. BLE is close behind and adds far more capability. UWB is the most expensive because cost scales with the area you anchor.
Which should I choose for most projects?
BLE, or BLE combined with Wi-Fi. It sits in the middle of the accuracy-cost curve: precise enough for the large majority of use cases, cheap enough to scale site-wide, and frugal enough that tags last years.
Can all three be used together?
Yes, and layering is common on complex industrial sites: Wi-Fi as the coverage baseline, BLE for precision and asset tracking, UWB in the specific cells where centimetres matter.
Which is best for asset tracking?
BLE. Tags are cheap, run for years, and 1-5 m answers the real question of where something is. See asset tracking.
Which is best for indoor navigation?
BLE and Wi-Fi together, since every smartphone supports both. UWB isn't practical here because it's absent from most devices. See indoor navigation.
Which is best for occupancy monitoring?
Wi-Fi usually suffices, because occupancy is a zone-level question and devices are already connected. BLE adds precision where finer zones are needed. See people counting.
Which is best for worker safety?
BLE, because safety depends on coverage without gaps and on badges that keep working for years. See worker safety.
Do I need UWB?
Only if sub-metre accuracy genuinely drives your process - tool positioning, robot safety envelopes, precision picking. For "which room, which zone, which aisle", BLE is the more economical answer.
Which technologies work with smartphones?
BLE and Wi-Fi work with essentially every phone. UWB is limited to newer premium devices, which rules it out for use cases relying on the public's own handsets.
Which has the longest tag battery life?
BLE, typically 1-5 years on a coin cell. Wi-Fi and UWB tags draw considerably more power, which matters when maintaining large fleets.
Can I use my existing access points?
Yes for Wi-Fi, and often for BLE too - many Cisco, HPE Aruba and Fortinet access points support both. UWB always requires its own anchors.
How do I decide?
Define the accuracy your process actually requires, then price covering your real footprint at that level, and check whether anything you track runs on a battery. Those three answers point to the right technology - or the right layering. See RTLS explained.
Tell us your use case - we'll show you where it lands
In a short technical session we'll map your accuracy requirement, your site footprint and your existing infrastructure onto the right technology - or the right layering of them.
- Runs on existing Cisco / Aruba / Fortinet infrastructure
- Software-first, hardware-agnostic, open API and SDK
- Cloud or on-premise, ISO 27001