Every patrol verification system needs a way to prove the officer was at a specific point at a specific time. The two common approaches are NFC tags, which the officer taps with their phone, and QR codes, which the officer scans with the camera. Both work. Both have failure modes. This comparison is written for operations managers deciding which to deploy, and the short answer is that most sites end up with both.
How each one works
An NFC tag is a small passive chip, usually inside a sticker, a plastic disc, or a keyfob. When an NFC-capable phone comes within a few centimetres, the phone powers the chip by induction and reads its unique identifier. The patrol app records the identifier, the time, and the device location.
A QR code is a printed two-dimensional barcode. The officer opens the patrol app, points the camera at the code, and the app decodes the identifier embedded in it. The app records the identifier, the time, and the device location in exactly the same way.
From the platform's point of view, a checkpoint scan is a checkpoint scan. The difference is entirely in the physical medium and the phone.
Durability
NFC tags win outdoors. An industrial NTAG213 or NTAG215 tag in a sealed disc will survive rain, UV exposure, temperature swings, and a reasonable amount of abuse. Tags rated for outdoor use are routinely in service for five years or more on fences, gates, and lamp posts.
QR codes are printed. Laminated codes last well indoors. Outdoors, they fade in sunlight, peel in rain, and become unreadable when scratched or dirty. A QR code on a yard fence in a port environment may need replacing every few months.
Winner outdoors: NFC. Indoors: a draw.
Cost
A bulk NFC tag costs roughly the same as a cup of coffee, with industrial outdoor variants costing a little more. For a site with 20 checkpoints, the one-time cost is small but not zero, and replacing a damaged tag means ordering stock.
A QR code costs the paper and lamination it is printed on. A site manager can print a replacement from the platform in a minute. For temporary sites, event venues, and construction sites where the layout changes weekly, this matters more than the per-unit cost.
Winner on cost and speed of replacement: QR.
Tamper resistance
This is where the two diverge most sharply.
A QR code can be photographed. An officer who photographs every code on a route can, in principle, scan the photographs from the break room. A platform that records device location alongside the scan will flag the mismatch, because the scan location will not match the checkpoint location. But a platform that relies only on the scan itself cannot tell the difference.
An NFC tag cannot be photographed. It can be removed and carried, which is a more deliberate act and leaves a visible gap at the checkpoint. Tags can also be ordered with tamper-evident construction that destroys the chip if the tag is peeled.
For high-value patrols where the client is paying for verified presence, NFC is the stronger choice. RouteProof records location with every scan regardless of medium, which closes most of the QR gap, but the physical tamper resistance of NFC is still a real advantage.
Winner: NFC.
Phone compatibility
Every modern smartphone has a camera, so every officer can scan a QR code. Not every phone has NFC. Most iPhones since 2018 and most mid-range Android phones support NFC reading, but budget Android handsets sometimes omit it, and company-issued rugged devices vary.
If your officers use their own phones, survey the fleet before committing to NFC-only. If the company issues handsets, specify NFC when purchasing and the question goes away.
Winner on universal compatibility: QR.
Lighting and environment
NFC does not care about light. An officer can tap a tag in a dark stairwell, a plant room, or a yard at 03:00 without using the torch. QR scanning needs enough light for the camera to resolve the code, which usually means switching on the phone torch, and it can struggle with glare, reflections on lamination, and codes behind glass.
NFC also works through thin non-metallic surfaces, so a tag can be mounted behind a plastic cover. It does not work on or near metal unless a ferrite-backed tag is used, which is a common mistake on gates and railings.
Winner in dark or difficult environments: NFC, with the metal caveat.
Scan speed and officer experience
Tapping an NFC tag takes under a second and requires no aiming. Scanning a QR code takes a few seconds: open the scanner, aim, wait for focus. Over a 20-checkpoint route walked four times a night, those seconds add up to minutes, and officers notice.
Officers also tend to prefer the tap. It feels like a confirmation rather than a task.
Winner: NFC.
Where each one fits
A practical deployment pattern used by many security companies looks like this.
- NFC tags on permanent outdoor checkpoints: fences, gates, yard perimeters, loading docks, and plant rooms.
- NFC tags at high-value indoor points where tamper resistance matters: server rooms, cash offices, pharmacy stores.
- QR codes at indoor checkpoints with good lighting: corridors, stairwell doors, lobby desks.
- QR codes on temporary sites: construction, events, and any site where the layout changes faster than tags can be ordered.
A patrol route can mix both. The officer taps where there is a tag and scans where there is a code, and the platform records both identically.
The decision in one paragraph
Choose NFC for durability, tamper resistance, dark environments, and officer speed. Choose QR for cost, instant replacement, and universal phone compatibility. Deploy both when a site has permanent outdoor points and changing indoor ones. Whichever you choose, insist that the platform records device location with each scan, because that single feature does more to protect the integrity of your patrol evidence than the medium itself. For how that evidence then reaches the client, see how to prove security coverage to clients without weekly phone calls.