Anthbot M9
For flat, tidy quarter-acre lawns on a budget, where it cuts neatly and quietly. Bumpy or overgrown yards will frustrate it.
Amazon $829 Anthbot $769$769
The Anthbot M9 is the better robot lawn mower overall, rated 4.3 to 3.8. The Anthbot M9 leads on value, features and warranty. The Anthbot M9 costs $382.63 less ($769 vs $1,151.63).
Sunseeker S4
#10 in Up to 1/4 acreFull review
For quarter-acre suburban yards with trees or walls that block satellite signal, where a LiDAR mower avoids RTK setup. Yards with steep slopes need an AWD model.
Amazon $1,151.63 Sunseeker $1,279.99$1,151.63
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Anthbot M9 for value ($3,080 per rated acre vs $4,610 per rated acre), features (8 of 8 vs 6 of 8; no 4G, height set in the app) and warranty (3-year warranty vs 2-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 1/4 acre robot lawn mower; a clear win is highlighted. How we rank explains each one.
| Factor weight | Anthbot M9 | Sunseeker S4 |
|---|---|---|
| Overall rating | 4.3/5 | 3.8/5 |
| Value 30% | 99 $3,080 per rated acre | 82 $4,610 per rated acre |
| Navigation 20% | 80 RTK + vision, no boundary wire | 85 LiDAR + vision, no boundary wire |
| Slopes 20% | 36 45% (24°) slopes | 31 42% (23°) slopes |
| Features 15% | 100 8 of 8 | 75 6 of 8; no 4G, height set in the app |
| Warranty 10% | 67 3-year warranty | 33 2-year warranty |
| Noise 5% | 80 58 dB(A) rated | 67 60 dB(A) rated |
Independent tests
Anthbot M9
| Tested by | Conditions |
|---|---|
| Notebookcheck | Covered almost 300 m² per charge. Recharging took about 2 hours, with just under 110 Wh drawn (peak 55 W) and about 7 W on standby. The cutting disc sits about 9 cm in from the body edge, which leaves an uncut strip. It struggled on rough or uneven ground. |
Sunseeker S4
| Tested by | Conditions |
|---|---|
| Tom's Guide | On the first cut, a charge lasted about 90 minutes. The test lawn was about 5,875 sq ft in two zones, and the backyard took just under 2 hours of cutting. |
Specifications
| Anthbot M9 | Sunseeker S4 | |
|---|---|---|
| Coverage | ||
| Lawn size (rated) | 0.25 acres (10,900 sq ft) | 0.25 acres (10,900 sq ft) |
| Max slope | 45% (24°) | 42% (23°) |
| All-wheel drive | - | No |
| Battery | 5 Ah | 20 V 4 Ah |
| Navigation | ||
| Navigation | RTK + vision | LiDAR + vision |
| Boundary wire needed | No | No |
| Obstacle avoidance | Dual 150° HDR AI cameras | 360° 3D LiDAR + monocular AI camera + bumper |
| Multiple zones | Yes | Yes |
| No-go zones | Yes | Yes |
| Cutting | ||
| Cutting width | 7.9 in (200 mm) | 7 in (178 mm) |
| Cutting height | 1.2–2.8 in (30–70 mm) | 1.6–3.2 in |
| Height adjustment | In the app | By hand (knob) |
| Blades | 5 free-rotating blades on a 20 cm disc | Six pivoting blades on a floating cutting disc |
| Edge mowing | On-edge mowing mode | Ride-on boundary cutting mode |
| Smart features | ||
| Connectivity | 4G | Wi-Fi, Bluetooth |
| Rain sensor | Yes | Yes |
| Anti-theft | GPS tracking with alerts when the mower leaves its zone | Optional 4G module with anti-theft tracking |
| Build | ||
| Noise (rated) | 58 dB(A) | 60 dB(A) |
| Water resistance | IPX6 | IPX6 |
| Weight | - | 26 lb (11.8 kg) |
| Warranty | 3 years | 2 years |