September 12, 2025 | Natalie Webber Robooter X40 vs XSTO M4 Powerchair: Models Compared If you’ve been researching the latest omnidirection electric wheelchairs, you may be wondering what the differences are between the Robooter X40 and XSTO M4 powerchairs, and which one is best for you. Here’s a complete comparison of both models; a non-biased, facts-first review of their advantages/disadvantages and their similarities/differences. What is the Robooter X40? The Robooter X40 is an indoor/outdoor powerchair with omnidirectional front wheels and lithium battery. It features a autofold mechanism, which means you can fold the Robooter X40 to the size of a large suitcase for storage or transport. The Robooter X40 is made in China. Top pros of the Robooter X40 compared to the XSTO M4 Modern Controls: The controls of the Robooter X40 are more modern, refined and user-friendly, with a clear angled digital screen showing battery level and speed on the same view. Comfortable Seat: More thought has gone into the seating on the Robooter X40 and most will find it more comfortable, with a curved, memory foam seat cushion and ergonomic honeycomb backrest. The angle adjustable armrests also allow you to choose the position most comfortable for you. Easier Transfers: With a flip-up footplate, the Robooter X40 is easier to transfer on and off from the front. Both models have flip-up armrests for side transfers. Find out more about the Robooter X40 What is the XSTO M4? The XSTO M4 is an indoor/outdoor powerchair with omnidirectional front wheels and lithium battery. It features seat lift and tilt and self-balancing technology, and its folding and splitable frame means you can dismantle the XSTO M4 for transport. The XSTO M4 is made in China. Top pros of the XSTO M4 compared to the Robooter X40 Transport Weight: The XSTO M4 splits into 3 sections for transport, with the heaviest part weighing 25kg. By contrast, the Robooter X40 weighs 41.8kg without the battery, so usually requires a ramp or hoist to get into a car boot. Omnidirection Performance: The XSTO M4’s omnidirectional driving is more fine-tuned than Robooter, giving sideways movement a slightly smoother feel with less vibration. Positioning Options: With height adjustment and being able to customise the angle of the seat, the XSTO M4 offers more control over your seating position. Self-Balancing: With the XSTO M4, the self-balancing technology means you’ll always stay sitting level on slopes – a feature not found on the Robooter X40. Find out more about the XSTO M4 Common features of the Robooter X40 and XSTO M4 Omnidirection front wheels USB port Lap belt Ergonomic joystick Freewheel mode Anti-tippers Auto speed reduction on slopes Robooter X40 vs XSTO M4: tech specs compared Robooter X40 XSTO M4 Length 1005mm (39.5in 1035mm (40.7in) Width 590mm (23.2in) 580mm (22.8in) Seat Width 420mm (16.5in) 470mm (18.5in) Seat Height 575mm (22.6in) 347 mm – 650 mm (13.6 – 25.5 in) Seat Depth 420mm (16.5in) 430mm (17in) Backrest Height 450mm (17.7in) 450mm (17.7in) Ground Clearance 70mm (2.7in) 50mm (2in) Turning Radius 760mm (29.9in) 780mm (30.7in) Motors 2 x 200W 2 x 250W Max Speed 4mph 4mph Max Obstacle Height 60mm (2.3in) 50mm (2in) Max Gradient 10° 15° Batteries 20Ah Optional 10Ah for airline travel 15.6Ah Optional 10Ah for airline travel Max Range 15 miles 11 miles Charging Time 4-6 hours 4 hours Wheels & Tyres Front: 10in omnidirectional wheels Rear: 10in pneumatic tyres Front: 10in omnidirectional wheels Rear: 10in pneumatic tyres Max User Weight 120kg (18.8st) 150kg (23.6st) Net Weight 41.8kg 25kg Crash Tested No No App Control Yes Yes Waterproof Level IPX4 IPX4 Colours 2 8 I trust this guide has given you a clear understanding of the differences between the Robooter X40 and XSTO M4, along with the benefits of each model. With this information, you should have a better idea of which model would be best for you. And, if you’d like to book a test drive of either, please get in touch. Related articles Robooter Powerchairs: An Honest Review (September 2024) Robooter power wheelchairs: which is best for me? Robooter Power Wheelchairs: Models Compared Get in touch Got a question or want to send us a message? Let’s talk.