The Sunseeker S4 is a wire free robot mower for small, mostly flat yards up to a quarter acre, often found for well under its list price. Testers praised its easy setup and even cut, but it struggles on steeper ground and leaves a strip of grass at the edges, so it is best for simple lawns.
What the Sunseeker S4 is
The Sunseeker S4 is a robot lawn mower built for lawns up to 1,000 square meters, or about a quarter acre Lawn and Landscape launch news ↗. It combines LiDAR with AI vision to map your yard and avoid obstacles, so it needs no buried boundary wire Lawn and Landscape launch news ↗.
Tom's Guide lists the navigation as a monocular camera plus a 360 degree LiDAR sensor, with no GPS antenna to install Tom's Guide review ↗. Bob Vila rates it for slopes up to 42 percent and named it Best for Small Yards in its 2026 test of seven wire free mowers Bob Vila test ↗.
Hands on testing is in progress, and we will update this review with our results.
What it does well
Setup is the S4's strongest point. Bob Vila found setup straightforward and the app easy to use, and the mower started working quickly with little troubleshooting Bob Vila test ↗. It scored 4.5 out of 5 for setup and mapping, its best category score Bob Vila test ↗. Tom's Guide also called setup and mapping easy after a month of use Tom's Guide review ↗.
It cuts evenly. Bob Vila saw generally very good, consistent mowing in normal conditions Bob Vila test ↗. Tom's Guide said its yard had not looked this good in years Tom's Guide review ↗.
The app covers the basics well. It saves multiple zones, sets schedules, shows a 3D LiDAR map and lets you choose traceless cutting or patterns Tom's Guide review ↗. It also reminds you to replace blades after 120 hours and wash the cutting disc after 60 hours Tom's Guide review ↗.
Because it does not rely on satellite positioning, there is no antenna mast to place and no GPS signal to worry about Tom's Guide review ↗. In the box you get the mower, a charging dock, spare blades and a brush for cleaning the LiDAR sensor Tom's Guide review ↗.
Where it falls short
Slopes are a problem. Bob Vila found its small front wheels struggled on steeper sections, and it rates for 42 percent slopes, well below the 65 to 84 percent of several rivals Bob Vila test ↗.
Edges are its other weak spot. The blades sit about 4.3 inches inside the edge of the housing, so a strip of grass along each boundary stays uncut, and Tom's Guide recommends keeping a trimmer handy Tom's Guide review ↗.
The cut is narrow. The deck is 7 inches wide, with height set from 1.6 to 3.2 inches by a manual dial, not from the app Tom's Guide review ↗. One battery run lasted about 90 minutes in Tom's Guide's tests, and a backyard took just under 2 hours of cutting, or just over 3 hours including charging Tom's Guide review ↗.
Bob Vila also called the design dated, with fewer premium touches and advanced navigation features than newer models Bob Vila test ↗. It is rated IPX6, but heavy rain left Tom's Guide's unit unresponsive until it dried out Tom's Guide review ↗.
Pricing and plans
The suggested retail price at launch was $1,599 Lawn and Landscape launch news ↗. Tom's Guide later saw a Sunseeker regular price of $1,799 with a sale price of $1,299 Tom's Guide review ↗.
Street prices vary a lot. Tom's Guide found it at The Home Depot and Lowe's for $1,399.99, Best Buy for $1,799.99, and on Amazon for around $984 to $999.99 at the time of its review Tom's Guide review ↗. Shop around before you pay list price.
It is sold direct from Sunseeker and through Amazon Lawn and Landscape launch news ↗. No subscription is mentioned on the pages we read. Ongoing costs are replacement blades, which the app prompts you to change every 120 hours Tom's Guide review ↗. None of the pages we opened state the warranty length, so check it with the seller.
Who should (and shouldn't) use it
- Good fit: small, flat lawns up to a quarter acre where you want the easiest possible setup.
- Good fit: yards with trees or buildings that block satellite signal, since it navigates with LiDAR and a camera instead of RTK Tom's Guide review ↗.
- Skip it if: your lawn has steep sections; testers saw it struggle Bob Vila test ↗.
- Skip it if: you want clean edges without a trimmer Tom's Guide review ↗.
- Skip it if: your lawn is bigger than a quarter acre.
Alternatives worth a look
- Segway Navimow i210 AWD: our budget pick for small yards, rated for 0.25 acre and 45 percent slopes with all wheel traction, listed at $1,049 Navimow store ↗ i210 AWD specs ↗.
- Worx Landroid Vision Cloud WR320: Bob Vila's easiest setup pick, rated for half an acre but only 30 percent slopes Bob Vila test ↗ Worx WR320 specs ↗.
- Airseekers Tron SE: Bob Vila's best value pick, rated for 0.37 acre and 65 percent slopes Bob Vila test ↗.
- Segway Navimow X430: our top pick for bigger and hilly lawns, listed at $2,499 for yards up to 1 acre Bob Vila test ↗ Navimow store ↗.
Where it appears
ComparedThe Best Robot Lawn MowerWhat’s good
- Easy setup
- Consistent mowing
What to know
- Dated features
- Weak on steep sections
Key features
- 0.25 acre rating, 42% slope
- Vision AI navigation
Questions people ask
How much does the Sunseeker S4 cost?
It launched at a suggested $1,599. Tom's Guide later found it from about $984 on Amazon up to $1,799.99 at Best Buy, with The Home Depot and Lowe's at $1,399.99 Tom's Guide review ↗ Lawn and Landscape launch news ↗.
Does the Sunseeker S4 need a boundary wire?
No. It uses LiDAR and AI vision to map the yard, with no buried wire or GPS antenna Tom's Guide review ↗ Lawn and Landscape launch news ↗.
How big a yard can the Sunseeker S4 mow?
It is built for lawns up to about a quarter acre and slopes up to 42 percent Bob Vila test ↗ Lawn and Landscape launch news ↗.
Is the Sunseeker S4 worth it?
For small, flat yards, it is easy to set up and cuts evenly. It struggles on steeper ground and leaves uncut edges, so hillier yards are better served by an all wheel drive model Bob Vila test ↗ Tom's Guide review ↗.
Where this comes from
Checked Oct 9, 2026. Vendor pages describe their own products; independent sources add outside views. Hands on testing is in progress.
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