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Robot Autonomy, Classified
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ComparisonGreenworks Optimow 15 and Stihl iMow 7

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 7
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. GoodOversized for small yards; covers efficiently but underutilizes runtime capacity.
¼ – ½ acre GoodSits within the documented 1,500 m² (0.37-acre) ceiling; the Optimow 15 is rated for this size range. GoodIdeal deployment zone; systematic pattern and 420-min runtime cover this range in single session.
Over ½ acrethey differ PoorCoverage limit is 1,500 m² (0.37 acres); yards over half an acre exceed the documented operating limit. DependsRated 5,000 sq m (~1.24 acres), the top of the iMOW range; larger yards need a second machine rather than a larger one.
Terrain
Mostly flat GoodFlat terrain is fully within operating envelope; no gradient concerns apply. GoodFlat terrain is the baseline; iMow 7 excels without slope challenges limiting traction.
Gentle slopes GoodRated for up to 35% gradient; moderate slopes are comfortably within documented operating limits. GoodRated to 45% gradient; moderate slopes are well within operating specifications per owner reports.
Steep / hilly DependsGreenworks specs the Optimow 15 at 35% maximum; sections near that limit warrant extra caution when grass is wet. DependsNear the 45% limit on wet grass, traction degrades; dry conditions perform better than wet.
Grass type
Typical lawn grass GoodRandomized mulching-cut pattern designed for standard-height turfgrass on a regular mowing schedule. GoodStandard turf and lawn grasses are the design baseline; systematic mowing pattern optimized for normal growth.
Mixed / tall growth DependsOvergrown grass above the blade design height may need a manual pre-cut before returning to regular automated sessions. DependsTall or overgrown grass may require multiple passes; blade wear accelerates with dense growth.
Thick (Bermuda / Zoysia) DependsDense thick-blade turf can slow progress; frequent short-duration passes are the documented mitigation for this grass type. DependsThick Bermuda or St. Augustine grass reduces cut speed; may require reduced cutting-height settings or longer run-time allocation.
Boundary setup
Wireless required PoorThe Optimow 15 requires physical perimeter wire; no wireless or GPS boundary option is available on this model. PooriMow 7 requires physical perimeter wire; no wireless virtual-boundary option available.
Wire required Good200 m of perimeter wire is included; the entire operating boundary is wire-defined, matching this setup. GoodPhysical perimeter wire is the required boundary system; installation is a one-time setup cost.
No preference GoodThis model is wire-only; factor in the one-time perimeter installation before committing to this setup. GoodUses perimeter wire. Fits readers with no boundary preference; wire is required.

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 7Specifications, 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.