| Global Score | |
| 77.7 | 76.1 |
| Basic Information | |
| HTC | Samsung |
| Android 5.0 | Android 10 |
| 2015-03-01 | 2020-06-29 |
| 5.69 x 2.74 x 0.38 inches | 6.61 x 3.02 x 0.32 inches |
| 5.54 ounces | 6.81 ounces |
| Black, Gold, Gray and Pink | Black |
| Aluminium | Plastic and Plastic |
| Scratch-Resistant Glass | -- |
| $ 178.00 | $ 194.00 |
| Display / Screen | |
| 5 inches | 6.5 inches |
| 1080 x 1920 pixels (Full HD) | 1600 x 720 pixels |
| S-LCD 3 | IPS LCD |
| 441 pixels per inch | 270 pixels per inch |
| Capacitive, Multi-touch | No touch screen |
| 9.3 | 7.3 |
| Performance | |
| Qualcomm Snapdragon 810 MSM8994 chipset | Mediatek Helio P35 chipset |
| 64-bit ARM Cortex-A57 (Quad-Core 2000 MHz + Quad-Core 1500 MHz) processor | Arm Cortex-A53, 64-bit, 12 nm (Octa-Core 2300 MHz) processor |
| 3 GB (800 MHz) RAM | 3 GB RAM |
| Adreno 430 (600 MHz) GPU | PowerVR GE8320 GPU |
| 9.99 | 9.27 |
| Storage | |
| 32 GB internal memory | 32 GB internal memory |
| microSD, microSDHC, microSDXC (up to 128 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 8.12 | 9.84 |
| Camera | |
| 20.00 MP + 4.00 MP | 16.00 MP + 13.00 MP |
| f/2.20 aperture | f/1.80 aperture |
| 27.80mm focal length | -- |
| 0.42 inches (1/2.4") sensor | 0.33 inches (1/3.06") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 10.12 | 9.35 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA, HSUPA, EDGE, GPRS and GSM | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM |
| 6.7 | 6.7 |
| Battery Life | |
| 2840mAh Li-Polymer Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| 391 hours standby time 25.4 hours talk time | -- |
| 4.8 | 5.92 |
| Other Features | |
| Bluetooth 4.1 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Infra-red port | -- |
| -- | Fingerprint ID Scanner |
| Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | FM Radio |
HTC One M9 is a little bit better than Galaxy A21, with a general score of 77.7 against 76.1. Both of these devices come with Android operating system, but HTC One M9 has 5.0 version and Galaxy A21 has Android 10. The HTC One M9 is an a lot older and somewhat thicker device than the Galaxy A21, but HTC made it somewhat lighter anyway.
HTC One M9 counts with a much better looking screen than Galaxy A21, because although it has a much smaller screen, it also counts with a better 1920 x 1080 resolution and a much greater display pixel density. The Samsung Galaxy A21 counts with a way bigger storage capacity for apps and games than HTC One M9, and although they both have the same 32 GB internal storage, the Samsung Galaxy A21 also has a SD card slot that admits a maximum of 512 GB.
The HTC One M9 has a little bit better hardware performance than Galaxy A21, and although they both have the same number of cores and a 3 GB RAM, the HTC One M9 also has an additional graphics processor and a 64 bits CPU. The Galaxy A21 counts with a much longer battery lifetime than HTC One M9, because it has 4000mAh of battery capacity.
HTC One M9 features a little bit better camera than Galaxy A21, because although it has a tinier aperture, it also counts with a camera with more megapixels, a lot better 3840x2160 video resolution and a much bigger camera sensor providing a way higher image quality.
Despite of being the best phone of the ones in this comparison, HTC One M9 is also the cheapest.
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