Micromax Ninja A91 vs Oppo A57

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.

• Width

  Ninja A91: 6.9 mm narrower

  Ninja A91:

  66 mm

  A57:

  72.9 mm

• Screen diagonal

  Ninja A91: 0.7 in smaller diagonal

  Ninja A91:

  4.5 in

  A57:

  5.2 in

• Chipset

  Ninja A91:

  Mediatek MT6577 (40 nm)

  A57:

  Qualcomm MSM8940 Snapdragon 435 (28 nm)

• Depth

  A57: 2.3 mm thinner

  Ninja A91:

  10 mm

  A57:

  7.7 mm

• Height

  Ninja A91: 19.1 mm shorter

  Ninja A91:

  130 mm

  A57:

  149.1 mm

• Release year

  Ninja A91:

  2013

  A57:

  2016

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 +2.3 mm versus A57

2. 2. A57

   Height:

   149.1 mm +19.1 mm versus Ninja A91

   Width:

   72.9 mm +6.9 mm versus Ninja A91

   Depth:

   7.7 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. A57

   Screen diagonal:

   5.2 in

   Aspect ratio (height:width):

   16:9

   Approximate rectangular screen area:

   74.5 cm²

A57 has approximately 33.5% 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.