Samsung Galaxy Ace 4 vs Xiaomi Redmi Note 9 Pro Max

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

  Galaxy Ace 4: 85.2 g lighter

  Galaxy Ace 4:

  123.8 g

  Redmi Note 9 Pro Max:

  209 g

• Width

  Galaxy Ace 4: 13.8 mm narrower

  Galaxy Ace 4:

  62.9 mm

  Redmi Note 9 Pro Max:

  76.7 mm

• Screen diagonal

  Galaxy Ace 4: 2.67 in smaller diagonal

  Galaxy Ace 4:

  4 in

  Redmi Note 9 Pro Max:

  6.67 in

• Rear camera layout

  Galaxy Ace 4:

  Single

  Redmi Note 9 Pro Max:

  Quad

• Depth

  Redmi Note 9 Pro Max: 2 mm thinner

  Galaxy Ace 4:

  10.8 mm

  Redmi Note 9 Pro Max:

  8.8 mm

• Height

  Galaxy Ace 4: 44.1 mm shorter

  Galaxy Ace 4:

  121.4 mm

  Redmi Note 9 Pro Max:

  165.5 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. Galaxy Ace 4

   Height:

   121.4 mm

   Width:

   62.9 mm

   Depth:

   10.8 mm +2 mm versus Redmi Note 9 Pro Max

2. 2. Redmi Note 9 Pro Max

   Height:

   165.5 mm +44.1 mm versus Galaxy Ace 4

   Width:

   76.7 mm +13.8 mm versus Galaxy Ace 4

   Depth:

   8.8 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. Galaxy Ace 4

   Screen diagonal:

   4 in

   Aspect ratio (height:width):

   5:3

   Approximate rectangular screen area:

   45.5 cm²

2. 2. Redmi Note 9 Pro Max

   Screen diagonal:

   6.67 in

   Aspect ratio (height:width):

   20:9

   Approximate rectangular screen area:

   107.4 cm²

Redmi Note 9 Pro Max has approximately 135.9% more rectangular screen area than Galaxy Ace 4.

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.