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Robot Autonomy, Classified
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ComparisonGreenworks Optimow 15 and Stihl iMow 6 EVO

Up to three

All robot lawn mowers. Every figure below is placed against the whole class, so a gap can be read against how much the class itself varies.

Where each one suits you.

The conditions each robot was assessed against, side by side. Rows marked in gold are where these machines genuinely differ.

Fit verdicts by condition for each robot
Condition Greenworks Optimow 15 Stihl iMow 6 EVO
Yard size
Under ¼ acre GoodWell within the 0.37-acre coverage limit; capable, though a smaller-class mower may serve this lot equally well. GoodRated to about 0.74 acres, well more coverage than a quarter-acre lawn requires; a smaller iMOW model would do the same job.
¼ – ½ acre GoodSits within the documented 1,500 m² (0.37-acre) ceiling; the Optimow 15 is rated for this size range. GoodAbout 0.74 rated acres comfortably covers this range, with the 28 cm cutting width doing the work in fewer passes.
Over ½ acrethey differ PoorCoverage limit is 1,500 m² (0.37 acres); yards over half an acre exceed the documented operating limit. GoodA rated ceiling of about 0.74 acres reaches into this bracket, and long daily run hours extend coverage further still.
Terrain
Mostly flat GoodFlat terrain is fully within operating envelope; no gradient concerns apply. Good45 percent standard slope tolerance leaves comfortable headroom for flat terrain and level ground.
Gentle slopes GoodRated for up to 35% gradient; moderate slopes are comfortably within documented operating limits. GoodRated to 45 percent slope as sold, with the gradient kit raising that to 55 percent for steeper hillside sections.
Steep / hilly DependsGreenworks specs the Optimow 15 at 35% maximum; sections near that limit warrant extra caution when grass is wet. DependsGerman testers report it can be stranded on the smallest edges of steep ground even with the gradient kit fitted.
Grass type
Typical lawn grass GoodRandomized mulching-cut pattern designed for standard-height turfgrass on a regular mowing schedule. GoodThree free-swinging blades in a mulching cut handle typical turf grass with a clean, documented cut pattern.
Mixed / tall growth DependsOvergrown grass above the blade design height may need a manual pre-cut before returning to regular automated sessions. DependsThe mulching cut and free-swinging blades are built for regular turf; no coverage evidence addresses mixed or overgrown grass.
Thick (Bermuda / Zoysia) DependsDense thick-blade turf can slow progress; frequent short-duration passes are the documented mitigation for this grass type. DependsNo documented cutting-power or blade-speed data addresses dense Bermuda or Zoysia; the mulching design is built for standard turf.
Boundary setup
Wireless required PoorThe Optimow 15 requires physical perimeter wire; no wireless or GPS boundary option is available on this model. PoorThe EVO range is a buried boundary wire design; there is no wire-free or satellite option on this model.
Wire required Good200 m of perimeter wire is included; the entire operating boundary is wire-defined, matching this setup. GoodA buried perimeter wire is the entire boundary system here, backed by ultrasonic obstacle sensors inside that fixed line.
No preference GoodThis model is wire-only; factor in the one-time perimeter installation before committing to this setup. GoodBoundary is wire-only regardless of preference, with ultrasonic sensors and obstacle detection working inside the buried perimeter.

A robot being poor for a condition is a fact about fit, not a fault. “Depends” means the record names a limit worth reading, not that the answer is unknown.

Keep going.

The full recordGreenworks Optimow 15Specifications, evidence, the Fit Check in full, and every tracked change.The full recordStihl iMow 6 EVOSpecifications, evidence, the Fit Check in full, and every tracked change.

Robovations classifies robots; it does not rank them. Nothing on this page is a recommendation, and no manufacturer influences a classification or its placement here.