The WORX WR310 is the smarter buy until a quarter acre becomes too small.

WORX Robot Lawn Mower for

VS

WORX WR320

The WR310 and WR320 are not two different ideas about robot mowing. They are two sizes of the same idea: remove the perimeter wire, skip the local RTK antenna and let cloud corrections, cameras and V-SLAM guide systematic passes around the lawn. Both can leave the sort of straight, quiet stripes that make an older random Landroid look restless and dated.

The useful distinction is capacity. The WR310 is rated for up to a quarter acre of mowable grass; the WR320 stretches that ceiling to half an acre. That does not make the WR320 a tougher mower. Both are two-wheel-drive machines, both depend heavily on the app and both are happiest on firm, maintained turf with clear boundaries.

This is why the smaller model wins for the yard it fits. Buying extra acreage does not improve grip in a damp hollow, make boundary edits less tedious or remove the strip beside a wall. It gives the mower more lawn to maintain through repeated cutting and charging. If the grass area genuinely exceeds a quarter acre, that capacity matters. If it does not, the WR320 mainly enlarges a problem the WR310 can already solve.

Neither model is a hands-off answer for rough ground. The shared weakness appears when narrow driven wheels turn across soft turf, meet a shallow rut or work through stressed St. Augustine. By the sixth week, centimeter-level positioning matters less than whether the robot can reach its charger without somebody walking outside to push it.

WORX Robot Lawn Mower for

WORX WR320

At a Glance

The WR320 buys area, not a better mower underneath

Acreage ratings describe ongoing maintenance, not a promise to finish the entire lawn on one charge or even within one day. The robot cuts, returns to its dock, recharges and resumes. A complicated half acre with narrow passages, obstacles and separate zones is a much larger assignment than an open rectangle of the same size. Measure only the grass, then leave capacity for growth, route inefficiency and days when weather shortens the schedule; the guide to robot-mower acreage ratings explains why the number on the box is a ceiling rather than a target.

The cutting experience is fundamentally the same

On suitable ground, both machines make a persuasive case for wire-free mowing. Parallel, checkerboard, diamond and natural patterns replace random wandering with orderly coverage. Frequent passes mulch tiny clippings back into the lawn, and the low noise makes daytime operation practical near a patio or home office.

Both are maintenance cutters. They should take a little growth often, not confront tall grass after a wet week. Toys, cords, branches and pet waste still need clearing even though the cameras recognize many common objects. Cautious avoidance can also leave generous islands around posts or debris, so avoiding a collision is not always the same as completing the cut.

The app remains the least finished part of both machines

Removing the wire makes the physical installation easier, but it does not make setup trivial. The dock still needs power, level ground, outdoor connectivity and a clear approach. Pairing expects 2.4GHz Wi-Fi, while mapping, paths, zones, firmware and no-go areas all demand attention before the mower settles into a routine.

The irritation arrives when that first map needs correction. A boundary change can require guiding the mower along the revised line instead of redrawing it cleanly on the screen. Lost positioning links, stale errors, awkward job cancellation and settings that do not behave consistently turn a quick correction into app administration. The full WR320 review covers that ownership experience in detail.

The hybrid navigation is still a genuine advantage. Cloud RTK avoids mounting a local reference antenna, while vision and V-SLAM can help beneath partial tree cover or beside buildings. Some shaded zones work well after manual mapping; others expose positioning weaknesses. Buyers with heavy canopy and tight passages should compare the stronger options for yards with trees and poor satellite reception rather than treating “Vision Cloud” as a guarantee.

Accessories do not erase the edge problem

The WR310 listing includes wheel brushes that clear grass buildup from the wheels. They are maintenance accessories, not cutting brushes, and they do not turn two-wheel drive into an all-terrain system. Exact WR310 battery capacity, runtime, recharge time, cutting width and height range are not established well enough to borrow the WR320’s figures.

The plain WR320 includes RadioLink but should not be confused with the WR320.1. It does not include the Cut-to-Zero attachment or headlights. The removable PowerShare battery is useful, particularly in a household that already owns compatible WORX tools, but another battery changes downtime rather than traction or managed area.

Both models can run a wheel onto flush paving and cut close to the grass line. A wall, fence, raised bed or drop prevents that overhang, leaving a strip for the string trimmer. Optional edge hardware can reduce the work on compatible boundaries, not repeal geometry. Dusk is another practical limit for the plain WR320 because its cameras can stop a run when light becomes insufficient.

WORX Robot Lawn Mower for

WORX WR320

Choose by the worst patch of the lawn

Choose the WR310 when the measured grass area sits comfortably below a quarter acre, the surface stays firm and the boundaries are easy for a camera to understand. It is especially appealing when the alternative is burying wire around a modest backyard. Expect an involved first map, keep the lawn tidy and schedule frequent daytime cuts.

Choose the WR320 when the same kind of lawn extends beyond the WR310’s sensible workload. The half-acre model earns its place through capacity alone, which is enough when capacity is the actual problem. It does not deserve the upgrade merely because a larger model sounds safer.

Walk away from both if the yard stays wet, contains ruts, forces off-camber turns or has meaningful slopes. The WR320 versus WR344 comparison shows what moving to WORX four-wheel drive changes, while the guide to mowers for hills and uneven ground covers alternatives when traction should lead the decision.

Also walk away if every boundary must look freshly trimmed or if setting up Wi-Fi, firmware and virtual zones already sounds like the chore the mower was meant to remove. These Landroids can replace the recurring bulk of mowing on the right property, but they do not replace judgment, cleanup or the occasional string-trimmer pass.

Smart Lawn Bots recommends the WR310 for the smaller suitable lawn and the WR320 only for buyers who can point to the additional grass that justifies it. The WR320 is more mower by area, not more mower where this platform most needs improvement.