Compare phones
| Global Score | |
| 72.6 | 76.1 |
| Basic Information | |
| Asus | Samsung |
| Android 12 | Android 10 |
| 2022-07-28 | 2020-06-29 |
| 5.77 x 2.68 x 0.36 inches | 6.61 x 3.02 x 0.32 inches |
| 5.96 ounces | 6.81 ounces |
| -- | Black |
| -- | Plastic and Plastic |
| Scratch-Resistant Glass | -- |
| -- | $ 194.00 |
| Display / Screen | |
| 5.9 inches | 6.5 inches |
| 2400 x 1080 pixels | 1600 x 720 pixels |
| Super AMOLED | IPS LCD |
| 446 pixels per inch | 270 pixels per inch |
| No touch screen | No touch screen |
| 7.7 | 7.3 |
| Performance | |
| Qualcomm Snapdragon 8+ Gen1 SM8475 (4 nm) chipset | Mediatek Helio P35 chipset |
| processor | Arm Cortex-A53, 64-bit, 12 nm (Octa-Core 2300 MHz) processor |
| 8 GB RAM | 3 GB RAM |
| Adreno 730 GPU | PowerVR GE8320 GPU |
| 6.21 | 9.27 |
| Storage | |
| 128 GB internal memory | 32 GB internal memory |
| No SD card slot | microSDXC (up to 512 GB) external memory slot |
| 10.1 | 9.84 |
| Camera | |
| 50.00 MP + 12.00 MP | 16.00 MP + 13.00 MP |
| f/1.90 aperture | f/1.80 aperture |
| 14.40mm focal length | -- |
| 0.64 inches (1/1.56") sensor | 0.33 inches (1/3.06") sensor |
| 7680 x 4320 (24 fps) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 1920 x 1080 (240 fps) (Full HD) slow motion video | -- |
| 12.43 | 9.35 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G) and HSDPA | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM |
| 10.6 | 6.7 |
| Battery Life | |
| 4300mAh Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 6.16 | 5.92 |
| Other Features | |
| Bluetooth 5.2 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
Comparison review
The Galaxy A21 has a general score of 76.1, which is a bit better than the Asus Zenfone 9's 72.6 global score. Both of these devices work with Android operating system, but Galaxy A21 has older 10 version and Asus Zenfone 9 has Android 12. Even though Galaxy A21 is notably older and somewhat heavier than the Asus Zenfone 9, it's body is still thinner.
The Galaxy A21 has a much more powerful processor than Asus Zenfone 9, although it has 5 GB less RAM, they both have 8 cores. Asus Zenfone 9 has a slightly better looking screen than Galaxy A21, because although it has a quite smaller screen, it also counts with a way better 1080 x 2400 resolution and much more pixels per inch in the screen.
Asus Zenfone 9 has a little bit more memory for games and applications than Samsung Galaxy A21, because although it has no external memory card slot, it also counts with 128 GB internal storage capacity. Asus Zenfone 9 features a lot better camera than Galaxy A21, because although it has a smaller aperture which is not good for taking photos or videos in poorly lited situations, it also counts with a way better 7680x4320 video resolution, a way larger back camera sensor capturing more light and vivid colors and a way more megapixels back-facing camera.
The Asus Zenfone 9 features a little longer battery performance than Samsung Galaxy A21, because it has a 4300mAh battery size.
Disclaimer: As an Amazon Associate I earn from qualifying purchases.