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Robot Autonomy, Classified
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ComparisonRobomow RK4000 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 Robomow RK4000 Stihl iMow 7
Yard size
Under ¼ acre GoodRuntime stretches thin on a 1/4-acre lot in a single cycle; works fine with split sessions or a slightly larger model. GoodOversized for small yards; covers efficiently but underutilizes runtime capacity.
¼ – ½ acre Good3,000-7,000 sqft is the optimal range; single battery charge covers most yards in this band. GoodIdeal deployment zone; systematic pattern and 420-min runtime cover this range in single session.
Over ½ acre DependsYards over 7,000 sqft may require multiple charge cycles; runtime tops out at 2 hours per battery. 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 GoodRandom-pattern coverage completes reliably on flat ground; the pendulum-suspended deck needs no incline compensation here. GoodFlat terrain is the baseline; iMow 7 excels without slope challenges limiting traction.
Gentle slopes GoodRobomow rates the RK4000 to a 45% gradient (about 24 degrees); gentle slopes sit well inside that rating. GoodRated to 45% gradient; moderate slopes are well within operating specifications per owner reports.
Steep / hilly DependsRated to 45% gradient (about 24 degrees) with passive slip-based traction; steeper banks exceed the rating and wet grass reduces grip. DependsNear the 45% limit on wet grass, traction degrades; dry conditions perform better than wet.
Grass type
Typical lawn grass GoodRandom-pattern coverage completes over typical lawn grass with no reported cutting-quality issues on standard turf. GoodStandard turf and lawn grasses are the design baseline; systematic mowing pattern optimized for normal growth.
Mixed / tall growth DependsNo published cutting-height range; mixed or tall growth performance is not documented for the offset-blade deck. DependsTall or overgrown grass may require multiple passes; blade wear accelerates with dense growth.
Thick (Bermuda / Zoysia) DependsBlade torque and cutting-height range for dense Bermuda or Zoysia are unpublished; performance on thick turf is unconfirmed. 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 RK4000 requires a buried boundary wire; there is no wire-free or RTK navigation mode available. PooriMow 7 requires physical perimeter wire; no wireless virtual-boundary option available.
Wire required GoodThis model is wire-guided by design; boundary wire installation is the standard, documented setup path. GoodPhysical perimeter wire is the required boundary system; installation is a one-time setup cost.
No preference GoodAny boundary preference is satisfied here since the RK4000 ships as a wire-guided mower only. 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 recordRobomow RK4000Specifications, 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.