Aria - Robot Girlfriend by Realbotix vs Elf-Xuan 2.0 by AheadForm

Aria and Elf-Xuan 2.0 are both built around lifelike faces, but they differ in body and mobility. Aria is a 175 cm, 54 kg humanoid with 44 degrees of freedom, including 17 facial motors, and a modular design with interchangeable faces and voices. Elf-Xuan 2.0 is a stationary upper-body robot whose face uses a very high number of degrees of freedom for fluid, asymmetrical expressions, and version 2.0 adds articulated arms. Aria offers a full human-sized figure, while Elf-Xuan 2.0 concentrates everything on the face and upper body.

Aria moves at about 2 km/h on a motorised wheeled base guided by waypoints, which suits smooth indoor floors. Elf-Xuan 2.0 does not walk or drive; it stays where it is installed. Aria can move to greet people, while Elf-Xuan 2.0 waits for people to come to it. Neither is designed to navigate complex spaces on its own.

Aria has cameras in its eyes and a wide-angle camera in its chest, plus microphones and proximity sensors. AheadForm has not published a sensor list for Elf-Xuan 2.0. Aria's eye cameras let it look at the person it is talking to. Ask AheadForm what cameras and microphones support Elf-Xuan 2.0's interaction.

Aria runs Realbotix software with conversational AI and can connect to external AI models through REST APIs. Elf-Xuan 2.0 is designed for face-to-face interaction, using its expressive face to make conversations feel natural. Aria's open connection to outside AI models gives owners more control over how it talks. Elf-Xuan 2.0's strength is the subtlety of its facial expressions.

Aria's 1.5 kWh lithium-ion pack gives 4 to 8 hours of use and recharges in 2 hours. AheadForm has not published power details for Elf-Xuan 2.0. Aria needs its battery to move around, while Elf-Xuan 2.0 can be installed near a power supply. For a full day of greeting, plan for a charging break with Aria.

Aria is aimed at companionship, customer greeting, telepresence and social entertainment. Elf-Xuan 2.0 suits reception desks, exhibitions and human-robot interaction research, where an expressive face matters more than mobility. Both are social robots rather than workers. Choose Aria for lifelike conversation and greeting on a mobile base, or Elf-Xuan 2.0 for expressive face-to-face interaction.

Aria runs Realbotix OS, with REST APIs and support for external AI models. AheadForm has not published SDK details for Elf-Xuan 2.0. Aria is the more open and better-documented platform for developers. Research teams interested in Elf-Xuan 2.0 should ask AheadForm about access to its face and arm controls.

Aria has an emergency stop, collision-avoidance thresholds and power cut-offs. Elf-Xuan 2.0 stays in one place and handles only light objects of about 1 to 2 kg, so it poses little risk of collision. Neither robot is designed to carry loads. Aria needs its safety features more because it moves among people.

Realbotix sells Aria from about $135,000 for the modular version to $175,000 for the full body. Elf-Xuan 2.0 is priced at around $50,000 to $150,000. Elf-Xuan 2.0 can come in well below Aria's entry price. Aria's premium buys a full-height mobile body, interchangeable faces and published battery and software details.