Compare Oppo A91 vs. Oppo A57s

	Oppo A91	Oppo A57s
Specifications
Brand	Oppo	Oppo
Model	-	-
Release Date	December 2019	September 2022
Operating System	ColorOS (Android 9.0)	ColorOS (Android 12)
Dimensions
Size	160.2 x 73.3 x 7.9 mm 6.31 x 2.89 x 0.31 in	163.8 x 75.0 x 8.0 mm 6.45 x 2.95 x 0.31 in
Weight	172 g 6.07 oz	187 g 6.60 oz
Screen
Size	6.4 inches	6.56 inches
Resolution	1,080 x 2,400 pixels	720 x 1,612 pixels
PPI	408	269
Features	OLED	-
Cameras
Rear	Quad camera 48 MP f/1.8 Wide 8 MP f/2.3 Ultra Wide 2 MP f/2.4 B/W 2 MP f/2.4 Depth	Dual camera 50 MP f/1.8 Wide 2 MP f/2.4 Depth
Front	16 MP f/2.0 Wide	8 MP f/2.0 Wide
Storage
Memory	4 GB 8 GB	4 GB
Fixed	128 GB	64 GB 128 GB
Removable	microSDXC	microSDXC
Processor
Chip	MediaTek Helio P70 Octa-core processor 12 nm	MediaTek Helio G35 Octa-core processor 12 nm
CPU	4x 2.10 GHz Cortex-A73 4x 2.00 GHz Cortex-A53	4x 2.30 GHz Cortex-A53 4x 1.80 GHz Cortex-A53
GPU	Mali-G72 MP3	PowerVR GE8320
Battery
Capacity	4,025 mAh	5,000 mAh
Features	Fast charging 20W	Fast charging 33W
Removable
Connectivity
5G
NFC
3.5 mm Audio Jack
Micro USB
USB Type-C
Lightning

Oppo A91	Oppo A57s

Released in December 2019. Features 6.4 inches screen with a resolution of 1,080 x 2,400 pixels and 408 ppi. Octa-core processor MediaTek Helio P70 with up to 8 GB memory and 128 GB storage. It has 4,025 mAh battery.	Released in September 2022. Features 6.56 inches screen with a resolution of 720 x 1,612 pixels and 269 ppi. Octa-core processor MediaTek Helio G35 with up to 4 GB memory and 128 GB storage. It has 5,000 mAh battery.
Head to Head
Lighter (9%) Much better quality screen (34%) OLED screen Probably more versatile rear camera May have more memory	Slightly larger screen (2%) Much better battery capacity (20%) Battery with better fast charging (39%) It has NFC

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