Coolpad Cool S1 vs vivo X21

Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

• Display technology

  OLED versus LCD

  Cool S1:

  LCD

  X21:

  OLED

• Weight

  X21: 11.8 g lighter

  Cool S1:

  168 g

  X21:

  156.2 g

• Screen diagonal

  Cool S1: 0.78 in smaller diagonal

  Cool S1:

  5.5 in

  X21:

  6.28 in

• Chipset

  Cool S1:

  Qualcomm MSM8996 Snapdragon 821 (14 nm)

  X21:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

• Rear camera layout

  Cool S1:

  Single

  X21:

  Dual

• Height

  Cool S1: 3.1 mm shorter

  Cool S1:

  151.4 mm

  X21:

  154.5 mm

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

1. 1. Cool S1

   Height:

   151.4 mm

   Width:

   74.7 mm

   Depth:

   7.5 mm

2. 2. X21

   Height:

   154.5 mm +3.1 mm versus Cool S1

   Width:

   74.8 mm

   Depth:

   7.4 mm

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

1. 1. Cool S1

   Screen diagonal:

   5.5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   83.4 cm²

2. 2. X21

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

X21 has approximately 18% more rectangular screen area than Cool S1.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

Battery capacity

Capacity is not battery life. No endurance test is implied.

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.