Key takeaways
- AGVs follow physical guidance; AMRs navigate from a map, typically with laser SLAM on existing walls, columns and racks.
- The main practical difference appears when layouts change or traffic is mixed, not on a single fixed route.
- Compare total cost over the system's life, including infrastructure, integration and future changes, not vehicle prices alone.
- AGVs remain a sound choice for fixed, stable routes and for sites that already run them.
The difference between AMR and AGV in one paragraph
An automated guided vehicle (AGV) follows a path defined by physical guidance: magnetic tape, wires in the floor, floor markers such as QR codes, or reflectors mounted around the site. An autonomous mobile robot (AMR) works from a digital map of the site and plans its own route, typically using laser SLAM to locate itself against existing walls, columns and racks.
In practice, AGVs suit stable, repetitive routes that will not change for years. AMRs suit layouts that change, routes shared with people, and operations that will grow in steps. For a single fixed route, both can do the job. The difference shows up when something changes.
The line between the two is blurrier than product brochures suggest. Some vehicles sold as AGVs use natural-feature navigation, and autonomous forklifts are often called forklift AGVs. Judge a vehicle by how it navigates and how it reacts to obstacles, not by its label.
Navigation and infrastructure
An AGV's path is part of the installation. Laying tape, embedding wires or fixing markers is floor work, and that guidance needs maintenance: tape wears under forklift traffic and markers get dirty or damaged. The upside is predictability. The vehicle goes exactly where the guidance goes, and the technology is well understood.
An AMR's laser scanners compare what they see with a stored map to work out where the robot is. Setting up a route means mapping the site and drawing routes and stations in software, usually with no changes to the floor. Laser navigation does need enough stable features to work with, so very open areas, or areas where everything around the robot moves, should be checked during the site survey.
Neither type removes the basics. Both need a floor in reasonable condition, with attention to cracks, slopes and thresholds. Both need reliable communication with the control system, which for AMRs usually means good Wi-Fi coverage along the routes. And both need integration with doors, lifts, conveyors and your host systems.
Flexibility when the layout changes
Changing an AGV route usually means re-laying tape or markers, reprogramming the path and testing again, often in an area that is in production. Each change has a cost and a lead time, which is why AGV routes tend to stay fixed once installed.
Changing an AMR route is mainly a software task: edit the map, move a station, add a route, then test. It is not zero effort, since new routes still need validation with real traffic and loads, but it avoids floor work and is easier to schedule around production.
The useful question is how often your layout really changes. New product introductions, line rebalancing, seasonal peaks and new storage areas all count. If changes come every year or more often, flexibility is worth paying for. If the same route will run unchanged for a decade, it matters much less.
Traffic with people and other vehicles
An AGV that meets an obstacle in its path stops and waits until the path is clear, because it cannot leave its guidance. That is predictable, which many operators like, but a pallet left in an aisle can hold up the whole route.
An AMR also slows down and stops for people and obstacles. Depending on how routes are configured, it can take an alternative path around a blocked aisle. Busy areas can have their own speed limits.
More freedom is not always better in a busy plant. Many sites deliberately restrict AMRs to defined lanes in shared areas so that people always know where robots will drive. When you evaluate a system, check whether you can choose, area by area, between free routing and fixed lanes. Whichever type you choose, carry out a risk assessment for your site and confirm compliance with the safety requirements that apply there.
Cost structure: what you actually pay for
Comparing the price of one vehicle against another is misleading, because the costs sit in different places. For AGVs, a larger share goes into guidance infrastructure and into every later route change. For AMRs, a larger share goes into software, mapping and fleet management, with lower costs when routes change.
Compare total cost over the period you expect to run the system. Include:
- Vehicles, chargers and any load-handling attachments.
- Guidance infrastructure and its maintenance, if any.
- Fleet management or dispatch software, which matters for both types once you run more than a few vehicles.
- Integration with MES, WMS, ERP, PLCs, doors, lifts and conveyors.
- Production disruption during installation and during each layout change.
- The cost of adding vehicles or routes as volumes grow.
When an AGV is still the better choice
AMRs are not the right answer for every flow. An AGV is often the more sensible choice when:
- The route is fixed for years, volumes are steady and nothing in the layout is expected to change.
- You already run AGVs with guidance in place and trained staff, and you only need to add a vehicle to the same system.
- The area offers few stable features for laser navigation, and installing physical guidance is the simpler fix.
- The load is very heavy or unusual and a purpose-built guided vehicle exists for it, while no AMR option fits.
- Your team values a vehicle that always follows exactly the same line over one that can route around obstacles.
A quick decision checklist
Answer these questions for each flow you want to automate. The more often you answer yes, the stronger the case for AMRs. If you mostly answer no, an AGV deserves a serious look.
- Will routes, stations or volumes change within the next few years?
- Do the robots share aisles with people, forklifts or carts?
- Do you want to avoid floor work and production stops during installation?
- Will you add vehicles, routes or other robot types over time?
- Do tasks need to come from MES, WMS or ERP rather than a fixed schedule?
- Do you want different robot types, such as lifting AMRs and autonomous forklifts, under one dispatch system?
Frequently asked questions
What is the main difference between an AMR and an AGV?
An AGV follows a fixed path defined by tape, wires, floor markers or reflectors. An AMR uses a map of the site to locate itself and plan routes, usually with laser SLAM, so it typically needs no floor changes and its routes can be changed in software.
Are AMRs safer than AGVs?
Neither type is safe or unsafe by default. Both can operate safely alongside people when they are correctly configured and the site has been risk-assessed. They behave differently: an AGV stops and waits on its path, while an AMR slows down, stops and, where allowed, routes around obstacles.
Can AMRs and AGVs work in the same facility?
Yes. If they run on separate control systems, shared intersections and doors need explicit coordination, for example zone interlocks. Running all robot types on one dispatch system avoids that extra layer.
Do AMRs need any changes to the floor?
Usually not. AMRs navigate by laser on existing walls, columns and racks, with no tape, magnets or QR codes. The floor still needs to be in reasonable condition, which a site survey checks.