BLU Bold N1 vs vivo X21 UD

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

  X21 UD: 25.8 g lighter

  Bold N1:

  182 g

  X21 UD:

  156.2 g

• Memory variants

  At 128 GB storage

  Bold N1:

  4 GB RAM

  X21 UD:

  6 GB RAM

• Chipset

  Bold N1:

  Mediatek MT6771V Helio P70 (12nm)

  X21 UD:

  Qualcomm SDM660 Snapdragon 660 (14 nm)

• Depth

  X21 UD: 1.2 mm thinner

  Bold N1:

  8.6 mm

  X21 UD:

  7.4 mm

• Height

  X21 UD: 4.2 mm shorter

  Bold N1:

  158.7 mm

  X21 UD:

  154.5 mm

• Release year

  Bold N1:

  2019

  X21 UD:

  2018

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. Bold N1

   Height:

   158.7 mm +4.2 mm versus X21 UD

   Width:

   74.1 mm

   Depth:

   8.6 mm +1.2 mm versus X21 UD

2. 2. X21 UD

   Height:

   154.5 mm

   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. Bold N1

   Screen diagonal:

   6.4 in

   Aspect ratio (height:width):

   19.5:9

   Approximate rectangular screen area:

   100.5 cm²

2. 2. X21 UD

   Screen diagonal:

   6.28 in

   Aspect ratio (height:width):

   19:9

   Approximate rectangular screen area:

   98.4 cm²

Bold N1 has approximately 2.1% more rectangular screen area than X21 UD.

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.