Micromax Ninja A91 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

  Ninja A91: 30.9 g lighter

  Ninja A91:

  149.1 g

  A31:

  180 g

• Width

  Ninja A91: 9.5 mm narrower

  Ninja A91:

  66 mm

  A31:

  75.5 mm

• Screen diagonal

  Ninja A91: 2 in smaller diagonal

  Ninja A91:

  4.5 in

  A31:

  6.5 in

• Rear camera layout

  Ninja A91:

  Single

  A31:

  Triple

• Depth

  A31: 1.7 mm thinner

  Ninja A91:

  10 mm

  A31:

  8.3 mm

• Height

  Ninja A91: 33.9 mm shorter

  Ninja A91:

  130 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. Ninja A91

   Height:

   130 mm

   Width:

   66 mm

   Depth:

   10 mm +1.7 mm versus A31

2. 2. A31

   Height:

   163.9 mm +33.9 mm versus Ninja A91

   Width:

   75.5 mm +9.5 mm versus Ninja A91

   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. Ninja A91

   Screen diagonal:

   4.5 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   55.8 cm²

2. 2. A31

   Screen diagonal:

   6.5 in

   Aspect ratio (height:width):

   20:9

   Approximate rectangular screen area:

   102 cm²

A31 has approximately 82.7% more rectangular screen area than Ninja A91.

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.