Lava Smart 4 vs Redmi K90 Ultra
The Lava Smart 4 (2026) runs on the Unisoc SC9863A, while the Redmi K90 Ultra (2026) runs on the Qualcomm Snapdragon 8 Elite; launch prices were $69 and $420. By overall MobileRank rating, the Redmi K90 Ultra leads — 73/100 vs 20/100 (a 53-point difference). Key differences: the Redmi K90 Ultra has the bigger battery (8550 mAh vs 5000); the main camera is 8 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 doesn't; the Lava Smart 4 is noticeably lighter (197g vs 227g).
Profile comparison
Category scores
Lava Smart 4
Redmi K90 Ultra
What makes Lava Smart 4 better?
- Lighter: 197g vs 227g
- Cheaper at launch: $69 vs $420
- Better portability (52/100 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 8MP
- Higher refresh rate: 165Hz vs 60Hz
- 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 31/100)
Comparison verdict
Comparing the Lava Smart 4 vs the Redmi K90 Ultra, the Redmi K90 Ultra scores 53 points higher (73/100 vs 20/100). 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). Value score: Lava Smart 4 — 36/100, Redmi K90 Ultra — 72/100; it shows how far a model sits above or below the usual level for its price, and is not part of the overall rating. In the "performance" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 (92/100 vs 9/100). In the "display" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 (94/100 vs 31/100). In the "camera" category, the Redmi K90 Ultra notably outperforms the Lava Smart 4 (37/100 vs 10/100). In the "battery" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 (78/100 vs 43/100). In the "portability" category, the Lava Smart 4 is a bit better (52/100 vs 40/100).
Specs comparison
| Specification | Lava Smart 4 | Redmi K90 Ultra | |
|---|---|---|---|
| Processor | Unisoc SC9863A | Qualcomm Snapdragon 8 Elite | |
| AnTuTu | 153667 | 3233695 | |
| Geekbench Single | 205 | 3013 | |
| Geekbench Multi | 846 | 9287 | |
| Display | 6.6" TFT LCD | 6.8" AMOLED | |
| Resolution | 540x1210 | 1280x2772 | |
| Refresh rate | 60 Hz | 165 Hz | |
| Battery | 5000 mAh | 8550 mAh | |
| Charging | 10W | 100W | |
| Main camera | 8 MP | 50 MP | |
| Ultrawide | 0 MP | 8 MP | |
| Front camera | 5 MP | 20 MP | |
| RAM | 3GB | 12GB / 16GB | |
| Storage | 32GB | 256GB / 512GB | |
| OS | Android 16 Go | Android 16 | |
| Brightness (peak) | — | 3500 nits | |
| NFC | no | yes | |
| Protection | — | IP68/IP69 | |
| Dimensions | 165.0×76.5×8.8 mm | 162.9×77.9×8.2 mm | |
| Weight | 197 g | 227 g | |
| Launch price | $69 | $420 |
Camera comparison
Lava Smart 4
- Main: 8MP
- Front: 5MP
Redmi K90 Ultra
- Main: 50MP f/1.7
- Ultrawide: 8MP
- Front: 20MP
Display comparison
Lava Smart 4
- 6.6" TFT LCD
- Resolution: 540x1210
- Refresh rate: 60 Hz
Redmi K90 Ultra
- 6.8" AMOLED
- Resolution: 1280x2772
- Refresh rate: 165 Hz
Battery and charging
Lava Smart 4
- 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 and Redmi K90 Ultra, covering their specs and all relevant benchmarks.
Redmi K90 Ultra leads Lava Smart 4 by 95.2% in our overall performance rating.
Benchmarks
Launch prices and where to check today's
Launch price difference: $351. Lava Smart 4 was $351 cheaper at launch.
Detailed category analysis
performance
In the "performance" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 (92/100 vs 9/100).
display
In the "display" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 (94/100 vs 31/100).
camera
In the "camera" category, the Redmi K90 Ultra notably outperforms the Lava Smart 4 (37/100 vs 10/100).
battery
In the "battery" category, the Redmi K90 Ultra significantly outperforms the Lava Smart 4 (78/100 vs 43/100).
portability
In the "portability" category, the Lava Smart 4 is a bit better (52/100 vs 40/100).
Frequently asked questions
Which is better: the Lava Smart 4 or the Redmi K90 Ultra?
The Redmi K90 Ultra significantly outperforms the Lava Smart 4 by 53 points (73/100 vs 20/100).
What is the rating of the Lava Smart 4 and the Redmi K90 Ultra?
The Lava Smart 4 has a MobileRank rating of 20/100, the Redmi K90 Ultra — 73/100.
Which has the better camera: the Lava Smart 4 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 or the Redmi K90 Ultra?
The Redmi K90 Ultra leads on performance (92/100 vs 9/100).
Should you choose the Lava Smart 4 over the Redmi K90 Ultra?
The Redmi K90 Ultra is a better fit for gamers and power users, those who care about battery life.