The Sunseeker S4 rates 3.8 among up to 1/4 acre robot lawn mowers; the Sunseeker X3 Plus rates 3.6 among 1/4 to 1 acre ones. The Sunseeker X3 Plus costs $314.65 less ($836.98 vs $1,151.63).
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 $1,279.99For small, fairly flat, open suburban lawns where buyers want wire-free mowing on a budget. Hilly or heavily shaded yards should look elsewhere.
Amazon $836.98 Sunseeker $999.99Prices 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.
These two sit in different size classes (up to 1/4 acre and 1/4 to 1 acre), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Sunseeker S4 | Sunseeker X3 Plus |
|---|---|---|
| Overall rating | 3.8/5 | 3.6/5 |
| Value 30% | 82 $4,610 per rated acre | 71 $2,790 per rated acre |
| Navigation 20% | 85 LiDAR + vision, no boundary wire | 80 RTK + vision, no boundary wire |
| Slopes 20% | 31 42% (23°) slopes | 9 30% (17°) slopes |
| Features 15% | 75 6 of 8; no 4G, height set in the app | 100 5 of 5 |
| Warranty 10% | 33 2-year warranty | 33 2-year warranty |
| Noise 5% | 67 60 dB(A) rated | 50 noise not published (neutral score used) |
| 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. |
No independent test published yet.
| Sunseeker S4 | Sunseeker X3 Plus | |
|---|---|---|
| Coverage | ||
| Lawn size (rated) | 0.25 acres (10,900 sq ft) | 0.3 acres (13,100 sq ft) |
| Max slope | 42% (23°) | 30% (17°) |
| All-wheel drive | No | - |
| Battery | 20 V 4 Ah | - |
| Navigation | ||
| Navigation | LiDAR + vision | RTK + vision |
| Boundary wire needed | No | No |
| RTK station | - | Included |
| Obstacle avoidance | 360° 3D LiDAR + monocular AI camera + bumper | AI camera + ultrasonic |
| Multiple zones | Yes | Yes |
| No-go zones | Yes | Yes |
| Cutting | ||
| Cutting width | 7 in (178 mm) | 8 in (203 mm) |
| Cutting height | 1.6–3.2 in | 1.6–3.2 in |
| Height adjustment | By hand (knob) | - |
| Blades | Six pivoting blades on a floating cutting disc | Offset blade disc |
| Edge mowing | Ride-on boundary cutting mode | Ride-on-edge cutting with offset blade disc |
| Smart features | ||
| Connectivity | Wi-Fi, Bluetooth | - |
| Rain sensor | Yes | - |
| Anti-theft | Optional 4G module with anti-theft tracking | GPS tracking and geofence alerts |
| Build | ||
| Noise (rated) | 60 dB(A) | - |
| Water resistance | IPX6 | - |
| Weight | 26 lb (11.8 kg) | - |
| Warranty | 2 years | 2 years |
