Steward vs Slopehelper
Two autonomous tractor machines, one verified table. Every figure below is sourced and dated; vendor claims are labelled and kept apart from independent results.
US aftermarket kit (proprietary control unit + dual-GNSS + cameras/obstacle sensors) that converts existing 80-150hp tractors — John Deere 5E/5M/6E, Kubota M5 and Fendt 700-series (Deutz-Fahr in development) — into autonomous units for mowing, seeding, tillage, rolling, hay cutting and (via a Verdant Robotics partnership) precision spray. Installed in roughly a day (press reports range from a few hours to two days) with a five-minute calibration; sold through Trimble's Vantage dealer network in the US and Canada, with roughly 300 systems operational as of mid-2026. A July 2026 oversubscribed Series B led by Leaps by Bayer, with Yara participating, is funding expansion.
Best for: US/Canadian row-crop, broad-acre and sod/turf operations with an existing fleet of compatible 80-150hp tractors who want autonomy without buying new large-horsepower machines — Sabanto pitches "gangs" of several sub-150hp tractors as a lower-capital alternative to one big autonomous unit.Slovenian heavy-duty autonomous tracked platform for vineyards and orchards — a full-cycle electric workhorse with 19+ hinged attachments covering mowing, mulching, spraying, harrowing, leaf removal, blossom thinning and harvest support. Suspended caterpillar tracks and gravity-stabilised cargo let it work slopes up to 42° where wheeled robots cannot go.
Best for: Vineyards and orchards on steep terrain wanting one electric platform to replace tractor passes across the whole season: soil work, canopy work, spraying and transport.| Steward Verified 2026-07-18 | Slopehelper Verified 2026-07-17 | |
|---|---|---|
| Overview | ||
| Task | Autonomous tractor | Autonomous tractor |
| Autonomy | Fully autonomous | Fully autonomous |
| Country of origin | United States | Slovenia |
| Availability | Available now | Available now |
| EU market | Pending | CE-marked |
| Lead time | Not disclosed | Not disclosed |
| Last verified | 2026-07-18 | 2026-07-17 |
| Specifications | ||
| Power source | Retrofit kit powered by the host tractor's own diesel powertrain — no dedicated power source of its own | Battery-electric · 48 V EV48 FEV lithium system · 8–12 h operation, 5–8 h recharge |
| Required tractor power | Aftermarket retrofit centred on 80-150hp tractors; compatible models include John Deere 5E (5075E, 5085E, 5090E, 5100E), 5M (5090M, 5095M, 5100M, 5105M, 5115M, 5120M, 5130M) and 6E (6105E, 6120E, 6135E cab-only) series, Kubota M5 (M5-091, M5-111), and Fendt 700-series (model year 2022+); Deutz-Fahr support is in development. Requires an electronic shuttle (PowrReverser) and factory grill guard on the host tractor | Not required (self-propelled tracked platform, ~2 t load capacity) |
| Dimensions | Not disclosed | 2.60 × 1.61 × 1.23 m |
| Weight | Not disclosed | 1,750 kg |
| Min farm size | Not disclosed | Not disclosed |
| Productivity | Roughly 300 systems operational across North America as of mid-2026 (Farmers Weekly); one large customer runs 25 units simultaneously (AgFunderNews); sod-farm customer Super-Sod runs 11 units across the southeastern US (Trimble customer story) | 8–12 h continuous operation per charge depending on task |
| Max speed | Up to 13 km/h in autonomous mode | 5 km/h (working range 0.5–5 km/h) |
| Sensors | Trimble BX992 dual-GNSS receiver for heading determination with Trimble CenterPoint RTX correction — sub-4cm guidance accuracy maintained under partial tree canopy; cameras and obstacle-detection sensors; onboard AI processing unit; cellular connection to the cloud | R-WAVE RTK/GNSS autonomy · 2D MP radar (±30 mm, 0.5–6 m) · encoders · dual electromechanical bumpers and radiowave safety scanners |
| Price & model | ||
| Price (EUR) | ≈€55,000 upfront, ≈€8,500/yr (indicative conversion — no direct EU pricing published) | from €100,000 |
| Native price | US$65,000 equipment + installation, plus a US$10,000 annual subscription (Farmers Weekly-reported dealer pricing, 2026) | from €100,000 (base platform); attachments €20,000–€60,000 |
| Business model | Buy the retrofit kit outright through Sabanto's dealer network (Trimble Vantage dealers in the US/Canada, e.g. Vanderloop Equipment for Fendt); requires a mandatory annual subscription for guidance/software | Buy from PeK Agroline; five-year manufacturer warranty |
| Ongoing cost | US$10,000/year subscription covering guidance service and software updates (Farmers Weekly-reported dealer pricing); individual low-cost sensors can disable the system if damaged ("it only takes one US$20 sensor to put a tractor out of action" — Farmers Weekly) | Battery charging and wear parts; TeroAir platform |
| Key outcome | ||
| Best verified result | Equipment capital investment (single-farm case study — Quint Pottinger, Kentucky) approximately 70% reduction in equipment capital investment · vendor | Soil compaction under machine −50% ground pressure · vendor |
| EU context | ||
| CE marking | Not disclosed — no CE-marking evidence found; confirmed deployments are US/Canada only | CE status not published; Slovenian manufacturer selling in the EU |
| Machinery Regulation | Not applicable — no evidence Steward has been placed on the EU market | Placed on the EU market by PeK Automotive; Regulation (EU) 2023/1230 autonomous-machine provisions apply |
| CAP subsidy | Not applicable — no EU/CAP-linked deployment found | Zero-emission electric platform supports fuel/emission-reduction and eco-scheme measures under CAP |
"—" means the manufacturer has not disclosed the figure; we never estimate silently. Model either machine's payback with your own numbers on its ROI calculator page.