Head to head
Melody vs UBTech U1
Melody (Realbotix, from $95,000) against UBTech U1 (UBTech Robotics, from $17,650), side by side on price, realism, specifications and availability.
The short version
- UBTech U1 scores higher on our Realism Index: 60/100 to Melody's 56. The widest gap is motion (50 vs 12).
- UBTech U1 is the cheaper way in: $17,650 against $95,000.
- Melody is no longer listed by its maker; UBTech U1 is on preorder.
- Melody also carries a $199.99/month software subscription.
Composed from the two directory records, so it updates when they do.
Our verdict
Melody shares Aria's 17-motor head and edges the U1 on face and body (80 and 74 against 76 and 70), but it stays put below the waist while the U1 walks on flat indoor floors. Melody was built to order from $95,000 plus $199.99 a month and runs whatever AI you wire into it, but Realbotix stopped listing it in October 2026. The U1's Lite and Pro trims cost a fraction of that and keep an encrypted memory on the robot, but the U1 doesn't accept user programming and its emotion-reading figures are company claims.
- Pick Melody if
- Pick Melody if you're a builder who wants an expressive, portable platform for your own AI, and Realbotix will still sell you one.
- Pick UBTech U1 if
- Pick the U1 if you want a companion that walks, for far less money, and are happy with the personality UBTech ships.
Melody56/100
UBTech U160/100
Realism Index sub-scores — six weighted dimensions built from public evidence. How we score
 |  | |
|---|---|---|
| Status | Unlisted | Pre-order |
| Type | Companion | Companion |
| Form | Modular | Full body |
| Presents as | Female-presenting | Male- or female-presenting |
| Price | Last listed Sept 2026: M-Series from $95k (launched ~$150k), plus $199.99/mo AI. No longer on Realbotix's site, so confirm pricing and availability with Realbotix. | U1 Lite (semi-torso) from ¥119,800 (~$17,650); full-body U1 Pro ¥169,800 (~$25,000); high-dynamic U1 Ultra up to ¥990,000 (~$146,500). Adults only. |
| Subscription | $199.99/mo | — |
| Availability | Last listed Sept 2026 | Preorder · deliveries claimed, no unit count |
| Origin | USA | China |
| Realism index | 56/100 | 60/100 |
| Height | 175 cm · 5 ft 9 in (third-party) | Male 183 cm (6 ft 0 in) · Female 168 cm (5 ft 6 in) |
| Weight | ~54 kg (third-party) | Male 42 kg · Female 35.2 kg |
| Skin & materials | Platinum-cure silicone | Proprietary biomimetic silicone skin; realistic hair; expressive face |
| Actuation | Dynamixel P-Series servos; 17 facial motors | 88 degrees of freedom; dual-pivot biomimetic neck; claims ~90% of basic human motion |
| Power | Built-in battery | Onboard rechargeable battery |
| Runtime | Several hours | ~2–4 hours per charge |
| AI & conversation | Open platform — proprietary AI or third-party (e.g. GPT) | Emotion-aware 'fast-and-slow' brain (100B+ params); ~500 ms reflexive response; 'Agent Memory OS' |
| Voice | Customisable voices | Conversational; speech-to-lip sync within ~20 ms |
| Mobility | Stationary from the waist; does not walk | Bipedal — walks, sits, stands on flat indoor floors; no stairs or rough terrain |
| Expressions | 17 facial motors; smoother P-Series motion | Reads 20+ emotions from face, tone and speech (>90% claimed); adaptive expression |
| Languages | 100+ languages | Mandarin at launch; others undisclosed |
| Connectivity | Wi-Fi, Bluetooth | Wi-Fi; head-mounted cameras; encrypted memory stored on-device (Rockchip RK3588) |