Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | ByteDance - Pico 4 Ultra | Valve - Index |
|---|---|---|
| Refresh rate | 90 Hz | 144 Hz |
| Field of view | 105 ° | 130 ° |
| Eye tracking | true | false |
| Color passthrough | true | false |
| Standalone | true | false |
Between the Pico 4 Ultra and Index, the Pico 4 Ultra comes out ahead in eye tracking / color passthrough, while the Index wins on refresh rate / field of view. Overall, the Pico 4 Ultra scores 70.6 and the Index scores 65.4 on our Mars Score.
Which should you buy?
The Pico 4 Ultra edges ahead on the Mars Score (70.6 vs 65.4), but the 5.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Pico 4 Ultra if you care most about eye tracking / color passthrough. The biggest gaps in its favor are eye tracking, color passthrough, standalone. The single most decisive one: Has Eye tracking.
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. The single most decisive one: Refresh rate — 60.00% more. 144 Hz vs 90 Hz.
There are no meaningful ties on the headline specs — every popular-comparison metric has a winner.
Bottom line: the Pico 4 Ultra is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: ByteDance - Pico 4 Ultra or Valve - Index?
ByteDance - Pico 4 Ultra leads the current Mars Score by 5.2 points.The more useful decision is the trade-off behind that result: compare refresh rate, field of view, standalone against the way you will actually use the product.
Choose ByteDance - Pico 4 Ultra if…
ByteDance - Pico 4 Ultra has the measurable edge on has eye tracking, has passthrough color, is standalone.
Choose Valve - Index if…
Valve - Index has the measurable edge on refresh rate hz, fov deg.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
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 |