O2 XDA Comet vs Oppo A31

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.

• Weight

  XDA Comet: 35 g lighter

  XDA Comet:

  145 g

  A31:

  180 g

• Width

  XDA Comet: 17.5 mm narrower

  XDA Comet:

  58 mm

  A31:

  75.5 mm

• Screen diagonal

  XDA Comet: 3.8 in smaller diagonal

  XDA Comet:

  2.7 in

  A31:

  6.5 in

• Rear camera layout

  XDA Comet:

  Single

  A31:

  Triple

• Depth

  A31: 10.7 mm thinner

  XDA Comet:

  19 mm

  A31:

  8.3 mm

• Height

  XDA Comet: 57.9 mm shorter

  XDA Comet:

  106 mm

  A31:

  163.9 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. XDA Comet

   Height:

   106 mm

   Width:

   58 mm

   Depth:

   19 mm +10.7 mm versus A31

2. 2. A31

   Height:

   163.9 mm +57.9 mm versus XDA Comet

   Width:

   75.5 mm +17.5 mm versus XDA Comet

   Depth:

   8.3 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. XDA Comet

   Screen diagonal:

   2.7 in

   Aspect ratio (height:width):

   4:3

   Approximate rectangular screen area:

   22.6 cm²

2. 2. A31

   Screen diagonal:

   6.5 in

   Aspect ratio (height:width):

   20:9

   Approximate rectangular screen area:

   102 cm²

A31 has approximately 351.8% more rectangular screen area than XDA Comet.

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.

At least two unambiguous positive capacity values are needed for a chart. Original entries remain in the specifications.

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.