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realme NARZO 100x 5G vs vivo Y21 5G

Same price. Here is what actually separates them.

The short version

Which one should you buy?

Same price: both start at ₹20,999 in India, so this comes down to what you get for it.

  • The realme NARZO 100x 5G has the bigger battery: 8,000 mAh against 6,500 mAh.
  • The realme NARZO 100x 5G has the better screen on paper: smoother (144Hz against 120Hz).
  • The Y21 5G is the lighter phone: 209 g against 224 g.
Which to buy

Get the realme NARZO 100x 5G for the bigger battery and the smoother screen. Get the Y21 5G for the lighter build.

Side by side

Every spec, lined up

Better on paper

Display

Specrealme NARZO 100x 5GY21 5G
Size 6.8 inches 6.74 inches
Panel LCD LCD
Resolution 1570 x 720 (HD+) 1600 x 720 (HD+) (better)
Refresh rate 144Hz (better) 120Hz
Peak brightness 1,200 nits 1,200 nits
Protection Panda 1681 Not listed

Performance

Specrealme NARZO 100x 5GY21 5G
Chipset MediaTek Dimensity 6300 Dimensity 6300
CPU Octa-core, up to 2.4GHz Octa-core, up to 2.4GHz
GPU Mali-G57 MC2 Not listed
RAM 4GB, 6GB 4GB, 6GB
Storage 64GB, 128GB, 256GB 64GB, 128GB
Software realme UI OriginOS 6, Android 16

Camera

Specrealme NARZO 100x 5GY21 5G
Rear cameras 50MP main 50MP main (f/1.8) + 0.08MP auxiliary (f/3.0)
Front camera 8MP (f/2.0) 5MP (f/2.2)
Video 1080p at 30fps (rear), 1080p at 30fps (front) Not listed

Battery

Specrealme NARZO 100x 5GY21 5G
Battery 8,000 mAh (better) 6,500 mAh
Wired charging 45W (better) 44W

Build and connectivity

Specrealme NARZO 100x 5GY21 5G
Network 5G, 4G LTE 5G, 4G
SIM Dual nano SIM Dual nano SIM (hybrid microSD slot)
Wi-Fi and Bluetooth Wi-Fi 5, Bluetooth 5.3 Wi-Fi (2.4GHz, 5GHz), Bluetooth 5.4
NFC No No
Dust and water IP65 IP65
Weight 224 g 209 g (better)
Thickness 8.8 mm 8.39 mm (better)
Colours Flash Orange, Midnight Black Champagne Gold, Midnight Blue

Availability

Specrealme NARZO 100x 5GY21 5G
Launch in India 15 Jul 2026 25 Mar 2026
Status On sale On sale
Price in India

Versions and prices

realme NARZO 100x 5G
  • 4GB + 64GB₹20,999
  • 4GB + 128GB₹22,999
  • 6GB + 128GB₹25,999
  • 6GB + 256GB₹28,999
Y21 5G
  • 4GB + 64GB₹20,999
  • 4GB + 128GB₹23,999
  • 6GB + 128GB₹27,999

Prices in India as we last checked them. Sales and bank offers change them often, so check before you buy.

Quick answers

realme NARZO 100x 5G vs Y21 5G, answered

In India, the realme NARZO 100x 5G starts at ₹20,999 and the vivo Y21 5G starts at ₹20,999.

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Which is cheaper, the realme NARZO 100x 5G or the Y21 5G?

Neither: both start at ₹20,999. The realme NARZO 100x 5G comes in 4 versions, up to ₹28,999. The Y21 5G comes in 3 versions, up to ₹27,999.

Which has the bigger battery, the realme NARZO 100x 5G or the Y21 5G?

The realme NARZO 100x 5G, with 8,000 mAh to 6,500 mAh. Charging is close too: 45W and 44W. Battery life also depends on the chip and the software, so treat these as a starting point.

Which has the better display?

On paper, the realme NARZO 100x 5G's: it is smoother (144Hz to 120Hz). The realme NARZO 100x 5G has a 6.8-inch LCD at 144Hz, the Y21 5G a 6.74-inch LCD at 120Hz.

Which has the better camera?

The main cameras are 50MP main on the realme NARZO 100x 5G and 50MP main (f/1.8) on the Y21 5G. A spec sheet can't show how the photos look, so read a review before you decide on the camera alone.

Which processors do they use?

The realme NARZO 100x 5G runs the MediaTek Dimensity 6300, the Y21 5G the Dimensity 6300.

Which is better protected against water?

Neither: both are rated IP65. Still, no phone is fully waterproof, so keep them out of the pool.

Which is lighter?

The Y21 5G, at 209 g to 224 g.