Comparison · 2 robots

Ambrogio Twenty Elite · Yard Force Compact 400Ri

All robot lawn mowers. Every measure below is plotted against the full class, so a difference can be read against how much the class itself varies.

Ambrogio Twenty Elite
Yard Force Compact 400Ri

Zucchetti Centro Sistemi

Ambrogio Twenty Elite

Autonomy: II Assisted Autonomy
Score: 69/100 Capable
Readiness: Ready Now
Price: $1,999list

Yard Force

Yard Force Compact 400Ri

Autonomy: II Assisted Autonomy
Score: 64/100 Capable
Readiness: Ready Now
Price: Not tracked

Up to three

01 Classification

What each one does on its own.

The Autonomy Ladder is the same five rungs for every robot on the site. A rung describes the conditions a robot handles without you, not how good it is.

Generalized

Any task, any setting

Environmental

Handles new obstacles without help

III

Conditional

Finishes familiar jobs on its own

Assisted

Runs preset routines, needs rescue

Ambrogio Twenty EliteYard Force Compact 400Ri

Manual

One action, on command

02 Assessment

Where they actually differ.

The Robovations Score is nine inputs across three pillars, each weighted as shown and each scored so that more is better. A robot can lead on one and trail on another, which is the point of showing them apart. Cost of ownership and data handling are reported on each robot's own page and are never averaged into the score.

Capability

Task completion16% of score

Does it finish the job it is sold to do, unattended

7570

Ambrogio Twenty Elite75
Yard Force Compact 400Ri70

18median 72 across 354 scored robots100

Coverage and navigation10% of score

Does it work the whole area, and hold that between runs

5042

Ambrogio Twenty Elite50
Yard Force Compact 400Ri42

15median 70 across 344 scored robots100

Edge-case recovery10% of score

Does it recover from the failures its category presents

4258

Ambrogio Twenty Elite42
Yard Force Compact 400Ri58

18median 50 across 261 scored robots100

Operating envelope4% of score

How far conditions can vary before performance drops

6264

Ambrogio Twenty Elite62
Yard Force Compact 400Ri64

25median 70 across 320 scored robots100

Dependability

Field failure rate16% of score

Documented hardware failures per owner-year

9685

Ambrogio Twenty Elite96
Yard Force Compact 400Ri85

6median 70 across 344 scored robots100

Software stability14% of score

Whether updates fix more than they break

5582

Ambrogio Twenty Elite55
Yard Force Compact 400Ri82

15median 65 across 275 scored robots100

Support longevity10% of score

Committed parts, service and updates, with dates

8548

Ambrogio Twenty Elite85
Yard Force Compact 400Ri48

0median 63 across 354 scored robots100

Ownership burden

Routine maintenance12% of score

Hands-on time it asks for in normal operation

4840

Ambrogio Twenty Elite48
Yard Force Compact 400Ri40

22median 68 across 355 scored robots100

Consumables8% of score

Parts that must be bought to keep it working

6976

Ambrogio Twenty Elite69
Yard Force Compact 400Ri76

30median 69 across 354 scored robots100

03 Measured against the class

How far apart is a long way?

A number only means something next to the spread it sits in. Each track below is the real range across every classified robot in the class, with the median marked.

Runtime74 with a published figure

120 min60 min

Ambrogio Twenty Elite120 min
Yard Force Compact 400Ri60 min

30 minmedian 110 min240 min

Charge time73 with a published figure

150 min100 min

Ambrogio Twenty Elite150 min
Yard Force Compact 400Ri100 min

30 minmedian 90 min300 min

Noise75 with a published figure

58 dB71 dB

Ambrogio Twenty Elite58 dB
Yard Force Compact 400Ri71 dB

50 dBmedian 60 dB82 dB

Weight84 with a published figure

33 lbs26.5 lbs

Ambrogio Twenty Elite33 lbs
Yard Force Compact 400Ri26.5 lbs

11.9 lbsmedian 29.8 lbs134 lbs

Height85 with a published figure

7.5 in8.3 in

Ambrogio Twenty Elite7.5 in
Yard Force Compact 400Ri8.3 in

7.5 inmedian 10.8 in16.5 in

Not compared, because fewer than two of these robots carry a published figure: Price, Suction.

04 Ownership

What the numbers leave out.

The trade-off

What each design gives up to be good at what it is good at.

Ambrogio Twenty Elite

Not recorded for this robot.

Yard Force Compact 400Ri

iRadar safety sensing increases cost but does not upgrade autonomy level. Ultrasonic obstacle detection reduces collision frequency (owner reports cite fewer dock impacts); the mower remains wire-dependent and cannot operate without boundary infrastructure.

Who each one is wrong for

Stated by the record itself. A robot being wrong for a household is a fact about fit, not a fault.

Ambrogio Twenty Elite

Wire-free or RTK-only installations: Perimeter wire is non-negotiable for this model. Retrofitting existing wireless infrastructure requires complete hardware replacement.
Sloped terrain above 45%: Ambrogio rates the Twenty Elite for a maximum permissible slope of 24 degrees, a 45 percent gradient. Above that the machine is outside its rating. Traction falls off on wet grass well below the limit, so grip on a steep bank is lowest after rain.
Owners seeking minimal seasonal setup: Annual wire inspection, repair, and replacement are baseline maintenance. Dormant-season storage preparation extends effort beyond blade changes.

Yard Force Compact 400Ri

North American buyers with limited service and parts availability: Yard Force support ecosystem is EU-first; repair and part sourcing in North America faces long lead times and high costs. Regional authorization is sparse.
Yards larger than 4,000 sq ft or with dense obstacles: A 16 cm cutting width and a 400 m2 rating cap effective coverage; iRadar obstacle sensing helps but does not enable efficient multi-zone operation or layout-change adaptability. Ground steeper than the rated 30 percent incline is outside what the machine is built for.
Owners seeking wire-free or GPS-based autonomy: Yard Force Compact 400Ri is wire-guided only; ultrasonic sensing is a safety layer, not a navigation alternative. RTK or vision-based mowers offer different operational models.

What stays your job

The upkeep ownership hands back to you, whatever the autonomy level says.

Ambrogio Twenty Elite

Seasonally: Inspect perimeter wire for breaks or corrosion; test continuity with a simple tone generator (~$15 tool).
Blade changes: Replace the four steel cutters as a set once edges are dull, chipped or bent. They are replace-only consumables: grinding a thin pivoting cutter thins the steel and unbalances the disc on a machine that runs unattended. Optional star blades fit the same mount.
Monthly: Clean dock charging contacts with dry cloth to prevent corrosion and missed charges.
Every 3-6 months: Check wire routing for rodent damage or displacement; re-stake or re-cover any section that has worked loose.
Annually: Prepare for dormant season by cleaning undercarriage and storing indoors with the battery left charged; check all fasteners and connectors before spring startup.

Yard Force Compact 400Ri

After every use: With the mower switched off, brush clippings from the underside and cutting disc; dry the exterior if it is wet.
Weekly: Charging station contacts and mower charging strips cleaned and dried.
Monthly: Perimeter-wire visual inspection; iRadar sensor faces wiped clear.
As needed: Replace all three disc blades as a set when dull, bent or chipped; spares ship in the box. Replace rather than sharpen, and change the full set so the disc stays balanced. Yard Force publishes no interval or spare price.
Seasonally: Wire condition audit and repair; mower and charging station stored in a cool dry location over winter.

05 Evidence

How much each of these is standing on.

Classifications rest on different depths of evidence. A pre-release assessment and a verified one are not the same kind of claim.

Evidence behind each classification
Robot	Evidence status	Sources reviewed	Last assessed
Ambrogio Twenty Elite	Provisional	3	Mar 2026
Yard Force Compact 400Ri	Provisional	2	Aug 2026