Best Overall
Segway Navimow X450 Robot Lawn Mower
Our verdict: Wire-free 4WD coverage for up to about 1.5 acres of slope.
The Navimow X450 is a wire-free robot mower with 4WD stated for 84% slopes and coverage up to 1.5 acres. It uses a zero-turn chassis, so it pivots in place at the edges. It sits in the $500 and up bucket. A zero-turn pivot avoids the wheel scuffs that a wide turning arc leaves on soft turf.
It ranks first because it matches the X430's traction while covering half an acre more. No other autonomous mower here states a slope figure at that level.
Buy it for larger sloped properties up to about 1.5 acres. The caveats are the premium tier and that it is not remote-driven. Skip it if you want to steer the mower by hand.
- Drive
- 4WD, stated for 84% slopes
- Coverage
- Up to 1.5 acres
- Setup
- Wire-free
- Chassis
- Zero-turn
What we like
- +Stated 84% slope capability
- +Covers up to 1.5 acres
- +No boundary wire
- +Zero-turn maneuvering
Watch out for
- −Premium price tier
- −Not remote-driven
Buy it if: Larger sloped properties up to about 1.5 acres.
Skip it if: You want to steer the mower by hand.


