Lava Smart 4 Plus vs Redmi K90 Ultra
The Lava Smart 4 Plus (2026) runs on the Unisoc SC9863A, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 21/100 (a 52-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5000); the main camera is 13 MP vs 50 MP; the Redmi K90 Ultra is faster in AnTuTu (3,233,695 vs 153,667); the Redmi K90 Ultra has NFC for contactless payments, the Lava Smart 4 Plus doesn't.
Profile comparison
Category scores
Lava Smart 4 Plus
Redmi K90 Ultra
What makes Lava Smart 4 Plus better?
- Better portability (46/100 vs 40/100)
What makes Redmi K90 Ultra better?
- Higher AnTuTu: 3233695 vs 153667
- Better Geekbench Single: 3013 vs 205
- Better Geekbench Multi: 9287 vs 846
- Bigger battery: 8550 vs 5000 mAh
- Faster charging: 100W vs 10W
- Better main camera: 50MP vs 13MP
- Higher refresh rate: 165Hz vs 90Hz
- Higher performance (92/100 vs 9/100)
- Better camera (37/100 vs 10/100)
- Longer battery life (78/100 vs 43/100)
- Better display (94/100 vs 43/100)
Comparison verdict
Comparing the Lava Smart 4 Plus vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 52 points higher (73/100 vs 21/100). In the "performance" category, the Redmi K90 Ultra leads (92/100 vs 9/100). In the "camera" category, the Redmi K90 Ultra leads (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra leads (78/100 vs 43/100). In the "performance" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus (92/100 vs 9/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus (94/100 vs 43/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Lava Smart 4 Plus (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus (78/100 vs 43/100). In the "portability" category, the Lava Smart 4 Plus is a bit better (46/100 vs 40/100).
Specs comparison
| Specification | Lava Smart 4 Plus | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Unisoc SC9863A | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 153667 | 3233695 | |
| Geekbench Single | 205 | 3013 | |
| Geekbench Multi | 846 | 9287 | |
| Display | 6.8" IPS LCD | 6.8" AMOLED | |
| Resolution | 720x1600 | 1280x2772 | |
| Refresh rate | 90 Hz | 165 Hz | |
| Battery | 5000 mAh | 8550 mAh | |
| Charging | 10W | 100W | |
| Main camera | 13 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 5 MP | 20 MP | |
| RAM | 4GB | 12GB / 16GB | |
| Storage | 64GB | 256GB / 512GB | |
| OS | Android 15 | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | no | yes | |
| Protection | IP64 | IP68/IP69 | |
| Dimensions | 165.0×76.1×8.5 mm | 162.9×77.9×8.2 mm | |
| Weight | — | 227 g | |
| Launch price | — | $420 |
Camera comparison
Lava Smart 4 Plus
- Main: 13MP
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Lava Smart 4 Plus
- 6.8" IPS LCD
- Resolution: 720x1600
- Refresh rate: 90 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Lava Smart 4 Plus
- 5000 mAh
- Wired: 10W
- No wireless charging
Redmi K90 Ultra
- 8550 mAh
- Wired: 100W
- No wireless charging
Overall performance score
We compared Lava Smart 4 Plus and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Lava Smart 4 Plus by 95.2% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Lava Smart 4 Plus
Price unknownDetailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus (92/100 vs 9/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus (94/100 vs 43/100).
camera
In the "camera" category, the Redmi K90 Ultra notably outperforms the Lava Smart 4 Plus (37/100 vs 10/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus (78/100 vs 43/100).
portability
In the "portability" category, the Lava Smart 4 Plus is a bit better (46/100 vs 40/100).
Frequently asked questions
Which is better: the Lava Smart 4 Plus or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Lava Smart 4 Plus by 52 points (73/100 vs 21/100).
What is the rating of the Lava Smart 4 Plus and the Redmi K90 Ultra?
The Lava Smart 4 Plus has a MobileRank rating of 21/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Lava Smart 4 Plus or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on camera score (37/100 vs 10/100).
Which is more powerful: the Lava Smart 4 Plus or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 9/100).
Should you choose the Lava Smart 4 Plus over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.