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Robovations
Robovations™
Robot Autonomy, Classified
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ComparisonGardena smart Sileno free 800

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 smart Sileno free 800
Yard size
Under ¼ acre GoodCoverage rated for up to 800 m² (8,600 sqft); quarter-acre yards fall well within range.
¼ – ½ acre DependsUpper end of rated coverage; multiple dock zones or split scheduling may be required for consistent weekly cuts.
Over ½ acre PoorExceeds 800 m² rating. Manufacturer documentation does not address larger properties; runtime and battery capacity unspecified for boundary sprawl.
Terrain
Mostly flat GoodIdeal operating condition. Flat turf with firm ground optimizes GPS accuracy and traction.
Gentle slopes DependsRated for up to 25% gradient; 15-20% slopes perform reliably. Steeper sections may cause traction loss or GPS signal fade.
Steep / hilly PoorAbove 25% gradient, traction failure and boundary-detection unreliability documented. Sidehilling on slopes above 20% produces GPS accuracy loss.
Grass type
Typical lawn grass GoodDesigned for standard residential turfgrass. Mulching blade and systematic navigation optimized for fine-to-medium blade grass types.
Mixed / tall growth DependsBlade dulling accelerates in tall or coarse grass; more frequent replacement intervals expected. Manufacturer cadence based on standard mowing height assumption.
Thick (Bermuda / Zoysia) DependsDense, thick grass increases blade stress and motor load; slower coverage and potential battery drain on single-pass schedules. Test in heavy-growth season before committing.
Boundary setup
Wireless required GoodWire-free GPS geofencing is this mower's defining feature. No perimeter wire required; virtual boundary drawn via app.
Wire required DependsThis mower does not support perimeter wire operation. If you prefer wire-based boundaries, older Sileno+ models (wired) offer that option with proven RTK availability on select tiers.
No preference GoodWireless GPS geofencing is the only boundary method available; no wire option. Works well for owners with no preference.

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 recordGardena smart Sileno free 800Specifications, 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.