Between the Pico 4 Ultra and Index, the Pico 4 Ultra comes out ahead in eye tracking and color passthrough, while the Index wins on refresh rate and field of view. Overall, the Pico 4 Ultra scores 57.4 and the Index scores 95 on our Mars Score.
Which should you buy?
The Index is the clear pick on raw spec strength, leading by 37.6 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Pico 4 Ultra if you care most about eye tracking and color passthrough. The biggest gaps in its favor are eye tracking, color passthrough, standalone.
Pick the Index if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are refresh rate, field of view.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the Index is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why ByteDance - Pico 4 Ultra wins
- ▲Has Eye tracking.
- ▲Has Color passthrough.
- ▲Standalone: true (vs false).
Why Valve - Index wins
- ▲Refresh rate — 60.00% more. 144 Hz vs 90 Hz.
- ▲Field of view — 23.81% more. 130 ° vs 105 °.
Spec comparison
Display
| Spec | ByteDance - Pico 4 Ultra | Valve - Index |
|---|---|---|
| Resolution per eye | 2160x2160 | 1440x1600 |
| Refresh rateⓘ | 90 Hz | 144 Hzlead |
| Field of view | 105 ° | 130 °lead |
| Panelⓘ | LCD | LCD |
Tracking & Audio
| Spec | ByteDance - Pico 4 Ultra | Valve - Index |
|---|---|---|
| Inside-out tracking | truelead | false |
| Eye tracking | truelead | false |
| Face tracking | truelead | false |
| Color passthrough | truelead | false |
Compute
| Spec | ByteDance - Pico 4 Ultra | Valve - Index |
|---|---|---|
| Standalone | truelead | false |
| Battery | 2.5 hlead | 0 h |
Frequently asked
Spec-level deep dives
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