A security robot is a mobile machine that patrols a site on a set route, records video, spots people or vehicles where they should not be, and alerts a human operator. Most are wheeled pods or four-legged robots. None can detain anyone, and all of them work best as an extra layer alongside guards, cameras and alarms.
This guide is for owners of car parks, warehouses, campuses, retail parks and industrial sites. We compare six options, from managed services to robots you can buy outright, and explain how to think about contracts and return on investment (ROI). For other robot types, see our service robot hub.
Security robots compared| Option | Price (Oct 2026) | Buying model | Indoor / outdoor | Best for |
|---|
| Knightscope | Quote | Managed service | Both | US property owners |
| SMP Robotics S5.3 / Argus | Quote | Buy, subscribe or lease | Outdoor | Large perimeters |
| Boston Dynamics Spot (Asylon) | Quote | Managed service | Both, rough terrain | Alarm response |
| Pudu D5 | $34,500 | Buy | Both, rough terrain | Value quadruped |
| DEEP Robotics Lynx M20 | $57,600 | Buy | Both | Industrial patrol |
| Enabot EBO X | $999 | Buy | Indoor | Small premises |
In depth: every pick
Best managed service (US)
1. Knightscope Autonomous Security Force (K7 and fleet)
Best for: US car parks, campuses, hospitals and commercial property that want one contract for robots and monitoring
- Model shown
- K7 autonomous security robot
- Service
- Robots, orchestration software and remote human agents under one contract
- Scale
- 434 clients, 42 US states, 4.4 million+ autonomous hours (per Knightscope)
Pros
- Single contract and single invoice
- Long track record of US deployments
- Human agents included in the service
Cons
- US only
- No public pricing; quote only
Verdict: Knightscope is the most established US provider of autonomous security robots as a service. It suits owners who want patrols and alerts without hiring robotics staff. Ask for references at sites similar to yours and for incident data from those deployments.
Best outdoor patrol robot to buy
2. SMP Robotics S5.3 and Argus
Best for: Large outdoor perimeters, solar farms, industrial yards and sites in harsh climates
- Models
- S5.3 for routine patrols; Argus with thermal (heat) camera
- Detection
- Argus detects people up to 200 m, including in total darkness (per SMP)
- Charging
- Autonomous ACS 5 charging station
- Connectivity
- Wi-Fi and mesh networking; optional satellite antenna
Pros
- Built for outdoor use, including desert and harsh climates
- Choice of purchase, hardware plus software subscription, or leasing
- Used in more than 15 countries (per SMP)
Cons
- No published prices
- Some series need a minimum order of three robots
Verdict: SMP is a good fit if you want to own the hardware and patrol a large outdoor area. Thermal models make night patrols more useful. Speak to an authorised distributor for pricing and local support.
Best for rough terrain and alarm response
3. Boston Dynamics Spot (via Asylon)
Best for: Distribution centres, factories and stadiums that need a robot to climb kerbs and respond to alarms
- Type
- Four-legged robot
- Uses
- Routine tours, alarm response and ad hoc missions
- Service
- Asylon sells a full-service model with live video and reporting
Pros
- Handles kerbs and uneven ground
- Can go first into potentially dangerous situations
- Asylon reports 70,000+ miles patrolled and 100,000+ missions with Spot
Cons
- No public price
- Remote monitoring is needed for full value
Verdict: Spot is the premium choice where wheeled robots struggle. Asylon's managed model, with replacement robots shipped during maintenance, removes much of the operational burden.
Best value rugged quadruped
4. Pudu D5
Best for: Sites with mixed terrain that also want escort or transport tasks
- Price
- $34,500 with extended 5-year warranty (Oct 2026, Hero Robots listing on Google Shopping)
- Type
- Four-legged robot for patrol, escort and transport
- Terrain
- Marketed for challenging terrain
Pros
- Published price with long warranty
- Multi-purpose: patrol plus light transport
Cons
- Security software and monitoring may need to be added separately
- Fewer security-specific deployments published than Knightscope or Spot
Verdict: The D5 is a lower-cost way into legged patrol robots. Confirm with the reseller which cameras, alert software and remote monitoring are included before comparing it with full-service options.
Best for industrial inspection patrols
5. DEEP Robotics Lynx M20
Best for: Industrial sites, utilities and plants combining security patrols with inspection
- Price
- $57,600 (Oct 2026, AltHumans listing); Pro version $72,000
- Type
- All-terrain quadruped
- Variants
- Lynx M20, M20 Pro, M20 S
Pros
- Published prices make budgeting easier
- Several variants to match budget and payload needs
Cons
- Security software usually comes from a separate integrator
- Limited English-language deployment data
Verdict: A capable platform for operators who already have a security operations centre and want hardware to plug into it. Budget for integration work.
Best budget indoor option for small premises
6. Enabot EBO X
Best for: Small offices or shops wanting a roaming camera after hours, not a guard
- Price
- $999 (Oct 2026, Best Buy and AltHumans listings)
- Type
- Home and small-office companion robot with camera
- Use
- Remote video check-ins on smooth indoor floors
Pros
- Low cost compared with commercial security robots
- Simple app control
Cons
- Consumer device, not an autonomous security robot
- Mixed owner ratings on retail sites
Verdict: Only consider this if you need an occasional remote look around a small indoor space. For genuine site security, a commercial system or monitored CCTV is the better investment.
How we chose
We have not deployed these robots on our own sites. Our picks are based on:
- Manufacturer and service provider information on capabilities, buying models and deployment scale.
- Published prices from named resellers where available. Most security robots are quote-only.
- Industry analysis of what security robots can and cannot do.
- Track record, including products that have been withdrawn. Amazon's Astro for Business, for example, was discontinued in 2024 less than a year after launch, with customers refunded.
What a security robot can and cannot do
Can: patrol a set route day and night, stream and record video, use thermal cameras to spot people in the dark, check doors and gates, play warning messages, and alert a remote operator.
Cannot: detain or arrest anyone, make judgement calls in a confrontation, or replace a trained officer's presence. AGV Network's analysis notes robots cannot yet replace human operators and are best seen as an additional barrier. Wi-Fi coverage outdoors and lighting for camera navigation are common practical limits.
Security robot cost and contract models
There are three main ways to pay:
- Managed service. A monthly or annual fee covering robots, software, maintenance and often remote monitoring. Knightscope and Asylon work this way. AGV Network cites around $8,000 a month as a typical rental figure, but gives no source, so treat it as a rough guide only.
- Buy plus software subscription. SMP Robotics offers full purchase or hardware purchase with a quarterly software subscription, as well as leasing.
- Buy outright. Quadrupeds such as the Pudu D5 ($34,500) and DEEP Robotics Lynx M20 ($57,600) have published reseller prices, but you will usually need to add security software and monitoring.
When comparing, ask what is included: cameras, analytics, video storage, remote operators, maintenance, replacement units and insurance.
ROI: comparing robots with guards and cameras
A security robot rarely makes sense as a straight swap for a guard. The better question is what mix of guards, fixed cameras, alarms and robots gives the coverage you need at the lowest total cost.
- List the patrols you need, by time of day and route length.
- Cost the current approach: guard hours, call-outs and false alarm costs.
- Cost the robot option, including contract fees, monitoring and the guard hours you still need.
- Value the extras: consistent patrol logs, video evidence and fewer risky night patrols for staff.
Ask providers for anonymised incident data from similar sites, not just marketing case studies.
Wheels or legs: which type of security robot do you need?
Wheeled patrol robots, like Knightscope's fleet and SMP's S5.3, suit car parks, paved yards, corridors and campuses. They are generally simpler to run and can carry larger batteries and camera masts.
Legged robots (quadrupeds), such as Boston Dynamics Spot, the Pudu D5 and DEEP Robotics Lynx, can handle kerbs, cables and rough ground that would stop a wheeled robot. They cost more to maintain and usually need a remote operator for best results.
Many sites end up with a mix: fixed cameras for constant coverage, a wheeled robot for routine tours and human guards for response.
Questions to ask any security robot provider
- Who watches the alerts, and how fast do they respond?
- How does the robot behave if someone blocks, pushes or vandalises it?
- What happens during rain, snow, heat or low light?
- How long is video stored, where, and who can access it?
- What uptime do you guarantee, and do you supply a replacement unit during repairs?
- What is the minimum contract length, and what are the exit terms?
- Can the robot integrate with our existing cameras, access control and alarm systems?
- Can we speak to a current customer with a similar site?
Privacy and legal points
Security robots collect video and sometimes number plates or faces. In the UK, that means UK GDPR applies, and you should run a data protection impact assessment, put up clear signs and set retention periods. In the US, rules vary by state, particularly for facial recognition and audio recording. Check with your insurer and, for public areas, your local authority before deployment.
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Frequently asked questions
Do security robots exist?
Yes. Companies such as Knightscope, SMP Robotics and Asylon (using Boston Dynamics Spot) run autonomous patrol robots at car parks, campuses, factories and logistics sites.
How much does a security robot cost?
Most commercial security robots are quote-only. Published reseller prices in October 2026 included $34,500 for a Pudu D5 and $57,600 for a DEEP Robotics Lynx M20. Managed services are priced per contract.
What is the best security robot for a house?
True security robots are built for commercial sites. For homes, monitored cameras and alarms are usually better value. Small roaming camera robots like the Enabot EBO X can give a remote look around, but they are not guards.
Can a security robot replace a security guard?
No. Robots cannot detain anyone or handle confrontations. They are best used to extend patrol coverage and free guards for response work.
Are security robots available in the UK?
SMP Robotics says its robots are used in more than 15 countries and sells through authorised distributors. Knightscope operates in the US. Check with each maker for UK distributors and support.
What happened to Amazon's Astro for Business?
Amazon discontinued Astro for Business in 2024, less than a year after launch, refunding customers and switching devices off, according to TechRadar.
ET
Written by our editorial team. We compare robots using manufacturer specifications, independent lab results and owner reviews, and we update guides when prices or models change. We do not accept payment for placement.
Our research method.
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- Knightscope
- SMP Robotics security robots
- Boston Dynamics: Intro to robotic perimeter security
- AltHumans security robots for sale
- AGV Network: Can autonomous security robots replace guards?
- TechRadar: Amazon is killing off its business patrol robot
- SafeHome.org: Home robots for security