Lone worker devices vs apps: which is right for your team?
By the SafetyEvo team · · 8 min read
A dedicated lone worker device is a separate alarm unit with its own GPS and SIM; a lone worker app turns the phone your staff already carry into the same thing. The honest answer to which is better is: it depends on the task, and for most roles the app wins because it is always there, while for a small number of roles the device wins because the worker cannot reach a phone. This guide sets out where each earns its place, what each really costs to run, and a checklist for deciding role by role.
What the law expects, and what it does not
The law does not require any particular equipment. It requires an employer to assess the risks of lone working and put reasonably practicable controls in place, and HSE’s guidance INDG73 expects lone workers to have a way to keep in touch and raise the alarm, with supervision that matches the risk. A device, an app, a radio or an agreed call-in schedule can all be that control. What matters is that it works where the work is done and that someone responds.
Where a dedicated device wins
- The worker cannot get to a phone: gloved hands, a harness at height, a confined space, a vehicle cab. A button on a lanyard or wrist can be pressed without looking.
- The alarm must be discreet. A device that looks like an ID badge can be triggered in a hostile room without anyone noticing.
- Phones are not allowed or not practical: some clinical, secure or industrial sites.
- The worker has no suitable phone and the employer does not want to provide one.
- Fall detection is a hard requirement. Dedicated devices with motion sensors are better at it than a phone in a pocket.
- You want a monitored service with a police response, which requires a BS 8484 certified provider and is usually sold with their device.
Where an app wins
- The worker already carries a phone all day. Nothing extra to charge, lose, forget in the van or leave in a drawer.
- You want more than a panic button: check-in timers for risky tasks, welfare checks from the office, a live map, incident timelines, and the same shift giving you clock-in and timesheets.
- The office responds to its own alerts. An app with an office mode puts the alert on the responder’s own phone with the worker’s location and a one tap acknowledge.
- Cost matters. There is no hardware to buy, replace or insure, and no separate SIM.
- Rollout speed matters. Invite by email, install, start a shift. A fleet of devices takes weeks to provision.
- Staff turnover is high. A licence moves to the next person; a device has to be retrieved, cleaned and reissued.
The honest limits of each
| Question | Dedicated device | Smartphone app |
|---|---|---|
| Battery | Own battery, typically days on standby; still needs charging and gets forgotten | Shares the phone battery; needs power management in the app and charging on long shifts |
| Signal | Own SIM, sometimes multi-network roaming SIMs that pick the strongest signal | The phone’s network; a good app queues the SOS and sends it the moment signal returns |
| Fall detection | Usually good; sensor worn on the body | Unreliable in a pocket or bag; SafetyEvo does not offer it |
| Check-ins and welfare checks | Basic or none on simple devices | Rich: timers, welfare checks with a deadline, silent phone detection |
| Office view | Via the vendor’s portal or monitoring centre | Live map, alert queue and timeline in a console and an office mode in the app |
| Attendance and rotas | No | Yes, from the same shift (SafetyEvo) |
| Cost of ownership | Device purchase or rental, SIM, replacement and repair, plus the service | Licence per person; the phone is already owned |
| Rollout | Procure, provision, issue, train, track | Invite, install, train |
| Discreet alarm | Yes | Possible with a hidden gesture or widget, less discreet than a badge |
Cost of ownership, without naming prices
Add up what you will pay over three years, not the headline figure. A device costs its purchase or rental, a SIM, replacements for the ones that are lost or broken (budget for a percentage each year), chargers, the monitoring service, and the staff time to provision and recover them when people join and leave. An app costs a licence per person per month and the staff time to invite and train people. Phones are already bought. If staff use their own phones, the risk assessment and the privacy notice must say so, and you may need to contribute to the cost; the ICO’s monitoring guidance covers the data side of personal devices.
A decision checklist, role by role
- Can this worker reach and use a phone at the moment they would need help? If no, device.
- Does the alarm need to be invisible to the people around them? If yes, device or a discreet trigger.
- Is fall detection a must for this task (height, confined spaces, working with machinery alone)? If yes, device, and reconsider whether the task should be done alone at all.
- Do you need check-ins, welfare checks and a live view for the office? If yes, app.
- Do you want attendance and rotas from the same tap? If yes, app.
- Do you need a monitored service with a police response? If yes, a BS 8484 certified provider, which today means their device or app.
- Everything else: app, and spend the money you save on training and drills.
Whichever you choose, the response is the product
An alarm with nobody named to answer it is not a control. Before you buy anything, write the escalation ladder: who is alerted first, second and third, by which channels, how long each has, and what they do. Then test it with a drill and time how long acknowledgement takes. SafetyEvo escalates by push, text and automated voice call until a named person acknowledges and records every step, because that, not the button, is what an incident report asks about.
Frequently asked questions
What is a lone worker device?
A dedicated piece of hardware, often shaped like an ID badge, a key fob or a watch, with an alarm button, GPS and its own mobile connection. It works without a phone and is usually sold with a monitoring service.
What is a lone worker app?
Software on the smartphone the worker already carries: an SOS button, check-in timers, live location while on shift, and alerts that reach named people. It uses the phone’s battery, signal and GPS.
Which is safer?
Neither is safer in itself. The safer option is the one the worker will actually have charged, reachable and switched on at the moment it is needed, with a response procedure behind it. For most roles that is the phone they never put down; for a few it is a device on a lanyard.
Does an app drain the battery?
Continuous GPS costs battery. A well built app only tracks while a shift is open, drops to low power when the phone is still, and reports its battery to the office so a flat phone is noticed before it matters. Expect to charge during a long shift either way; a device needs charging too.
What about BS 8484?
BS 8484 is the British Standard for lone worker services that include an alarm receiving centre and is what allows a monitoring centre to request a police response. It applies to the service, not to the choice of device or app. If you need a monitored service, ask the provider for their certificate. SafetyEvo is not BS 8484 certified; its monitored plan is planned, not live.
Can we mix the two?
Yes, and many employers do: an app for everyone, with a Bluetooth button or a dedicated device for the roles that cannot reach a phone. SafetyEvo’s Bluetooth SOS button is coming soon.
How this guide was written
Written by the SafetyEvo team, who build lone worker safety software and use it in their own field business. Every legal point is checked against the primary source listed below, the guide carries the date it was published and the date it was last reviewed, and it is corrected when the law or the guidance changes. It is general guidance, not legal advice for your situation.
Sources
This article is general guidance, not legal advice. For your own situation, speak to a health and safety or legal adviser.