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Robot Autonomy, Classified
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ComparisonStihl iMow 7 and Yard Force Compact 400Ri

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 Stihl iMow 7 Force Compact 400Ri
Yard size
Under ¼ acre GoodOversized for small yards; covers efficiently but underutilizes runtime capacity. Good30 cm cutting width and 45-minute runtime handle yards under 3,500 sq ft in one to two passes.
¼ – ½ acrethey differ GoodIdeal deployment zone; systematic pattern and 420-min runtime cover this range in single session. Depends3,500-5,000 sq ft requires two to three mowing sessions per week due to limited cutting width and runtime.
Over ½ acrethey differ 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. PoorOver 5,000 sq ft exceeds practical reach; multiple sessions per week and frequent charging conflicts with hands-off operation.
Terrain
Mostly flat GoodFlat terrain is the baseline; iMow 7 excels without slope challenges limiting traction. GoodFlat yards are the design baseline; gyroscope traction control operates optimally on level ground.
Gentle slopesthey differ GoodRated to 45% gradient; moderate slopes are well within operating specifications per owner reports. DependsRated for slopes up to 12-15 degrees; lightweight design and modest motor may struggle above 12 degrees.
Steep / hillythey differ DependsNear the 45% limit on wet grass, traction degrades; dry conditions perform better than wet. PoorAbove 15 degrees, traction degrades and motor load exceeds design limits; owner reports document unreliable operation.
Grass type
Typical lawn grass GoodStandard turf and lawn grasses are the design baseline; systematic mowing pattern optimized for normal growth. GoodStandard residential turf is the design baseline; consistent results on typical European fescue and bluegrass.
Mixed / tall growth DependsTall or overgrown grass may require multiple passes; blade wear accelerates with dense growth. DependsOvergrown grass (>3 cm) reduces runtime by 20-25% and motor efficiency; pre-mowing recommended if lawn height exceeds 2.5 inches.
Thick (Bermuda / Zoysia) DependsThick Bermuda or St. Augustine grass reduces cut speed; may require reduced cutting-height settings or longer run-time allocation. DependsThick or dense grass increases blade dulling and battery drain; maintenance cycles shorten and weekly pre-mowing helps cutting consistency.
Boundary setup
Wireless required PooriMow 7 requires physical perimeter wire; no wireless virtual-boundary option available. PoorWire-guided only; iRadar is a safety addition, not a navigation alternative. This mower requires perimeter wire.
Wire required GoodPhysical perimeter wire is the required boundary system; installation is a one-time setup cost. GoodPerimeter-wire system is the sole navigation method; iRadar sonar complements wire-based operation for obstacle detection.
No preference GoodUses perimeter wire. Fits readers with no boundary preference; wire is required. GoodWire is required; no wireless fallback. If you can accept wire commitment, the Compact 400Ri works well with iRadar safety enhancement.

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 recordStihl iMow 7Specifications, evidence, the Fit Check in full, and every tracked change.The full recordYard Force Compact 400RiSpecifications, 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.