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InnoReviews

OPPO K13x 5G vs Samsung Galaxy S21 Ultra

OPPO K13x 5G
37.3Inno Score
VS
WINNER
Samsung Galaxy S21 Ultra
53.9Inno Score
21.8Performance37.2
45.2Display56.3
29Camera72
61.9Battery46.4
36Features78.7
5 spec wins — OPPO K13x 5G10 spec wins — Samsung Galaxy S21 Ultra

InnoReviews verdict

Samsung Galaxy S21 Ultra wins this phone face-off, 53.9 to 37.3, pulling ahead mainly in camera (+43) and features (+43). OPPO K13x 5G still makes sense if its price or standout specs fit your needs better.

Which would you pick?

Key differences

Reasons to pick the OPPO K13x 5G

  • Stronger battery score: 62 vs 46
  • 80% higher Wired charging: 45 W vs 25 W
  • 20% higher capacity: 6,000 mAh vs 5,000 mAh
  • 15% lower weight: 194 g vs 228 g
  • 11% lower thickness: 7.9 mm vs 8.9 mm

Reasons to pick the Samsung Galaxy S21 Ultra

  • Stronger performance score: 37 vs 22
  • Stronger display score: 56 vs 45
  • Stronger camera score: 72 vs 29
  • Stronger features score: 79 vs 36
  • 400% higher Front camera: 40 MP vs 8 MP

Display

Display comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
Screen size6.67 ″6.8 ″+2%
Panel typeIPS LCDLTPO AMOLED
Resolution1604x7203200x1440
Pixel density264 ppi515 ppi+95%
Refresh rate120 Hz120 Hz
Peak brightness1,000 nits1,500 nits+50%
Screen-to-body89.9 %—

Performance

Performance comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
ChipsetMediaTek Dimensity 6300Samsung Exynos 2100
AnTuTu—783,817Bottom 22%
AnTuTu 11 (CPU)—263,424Bottom 17%
AnTuTu 11 (GPU)—126,989Bottom 33%
AnTuTu 11 (Memory)—165,563Bottom 35%
AnTuTu 11 (UX)—227,841Bottom 20%
Geekbench 6 (single)785Bottom 19%1,430+82%Top 46%
Geekbench 6 (multi)1,984Bottom 16%3,550+79%Bottom 50%
RAM (max)8 GB12 GB+50%
Storage options128GB128GB / 256GB / 512GB
Storage typeUFS 2.2UFS 3.1

Camera

Camera comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
Main camera50 MP108 MP+116%
Main aperturef/1.8f/1.8
Ultra-wide—12 MP
Telephoto—10 MP
Optical zoom—10 x
Max video1080p@60fps8K@24fps
Front camera8 MP40 MP+400%
OISNoYes

Battery

Battery comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
Capacity6,000 mAh+20%5,000 mAh
Wired charging45 W+80%25 W
Wireless charging—15 W

Design

Design comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
Weight194 g+15%228 g
Thickness7.9 mm+11%8.9 mm
IP ratingIP65IP68
Frame materialPlasticAluminum

Connectivity

Connectivity comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
5GYesYes
Wi-FiWi-Fi 5Wi-Fi 6E
Bluetooth5.45.2
NFC—Yes
USBUSB-CUSB-C 3.2
eSIM—Yes

Software

Software comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
OS at launchAndroid 15 (ColorOS 15)Android 11 (One UI 3.1)
OS update pledge2 years4 years+100%

Audio

Audio comparison: OPPO K13x 5G versus Samsung Galaxy S21 Ultra
SpecOPPO K13x 5GSamsung Galaxy S21 Ultra
Stereo speakers—Yes
3.5mm jackYesNo

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