| Global Score | |
| 77.7 | 87.7 |
| Basic Information | |
| HTC | Samsung |
| Android 5.0 | Android 10 |
| 2015-03-01 | 2020-09-11 |
| 5.69 x 2.74 x 0.38 inches | 6.45 x 3.00 x 0.37 inches |
| 5.54 ounces | 7.51 ounces |
| Black, Gold, Gray and Pink | Black and White |
| Aluminium | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 178.00 | -- |
| Display / Screen | |
| 5 inches | 6.7 inches |
| 1080 x 1920 pixels (Full HD) | 2340 x 1080 pixels |
| S-LCD 3 | Super AMOLED Plus |
| 441 pixels per inch | 385 pixels per inch |
| Capacitive, Multi-touch | No touch screen |
| 9.3 | 8 |
| Performance | |
| Qualcomm Snapdragon 810 MSM8994 chipset | Qualcomm Snapdragon 730 SM7150-AA chipset |
| 64-bit ARM Cortex-A57 (Quad-Core 2000 MHz + Quad-Core 1500 MHz) processor | Kryo 470, 64-bit, 8 nm (Octa-Core 2200 MHz) processor |
| 3 GB (800 MHz) RAM | 6 GB RAM |
| Adreno 430 (600 MHz) GPU | Adreno 618 GPU |
| 9.99 | 9.27 |
| Storage | |
| 32 GB internal memory | 128 GB internal memory |
| microSD, microSDHC, microSDXC (up to 128 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 8.12 | 14.14 |
| Camera | |
| 20.00 MP + 4.00 MP | 64.00 MP + 32.00 MP |
| f/2.20 aperture | f/1.80 aperture |
| 27.80mm focal length | 26.00mm focal length |
| 0.42 inches (1/2.4") sensor | 0.57 inches (1/1.76") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| 10.12 | 11.88 |
| 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, Dual SIM |
| 6.7 | 6.7 |
| Battery Life | |
| 2840mAh Li-Polymer Battery | 7000mAh Battery |
| Non-Removable Battery | Non-Removable Battery |
| 391 hours standby time 25.4 hours talk time | -- |
| 4.8 | 8.32 |
| 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 |
Galaxy M51 is better than the HTC One M9, getting a general score of 87.7 against 77.7. Both of these devices come with Android OS (operating system), but Galaxy M51 has the newer 10 version and HTC One M9 has Android 5.0. The Galaxy M51 is a notably newer and just a little thinner cellphone than the HTC One M9, although it's also way heavier.
The HTC One M9 has a bit more powerful processing unit than Samsung Galaxy M51, because although it has less RAM, and they both have 8 processing cores, the HTC One M9 also counts with an additional graphics co-processor and a 64 bits processing unit. The HTC One M9 has a sharper display than Samsung Galaxy M51, because although it has a bit worse resolution of 1920 x 1080 pixels and a lot smaller screen, it also counts with a little better pixels density.
The Samsung Galaxy M51 shoots better pictures and videos than HTC One M9, and although they both have the same video frame rate and the same 3840x2160 video resolution, the Samsung Galaxy M51 also has a lot larger sensor taking lot higher quality videos and pictures, a back camera with a lot higher resolution and a larger aperture.
The Samsung Galaxy M51 has a much greater memory capacity to install applications and games or saving photos and videos than HTC One M9, because it has 128 GB internal memory and a slot for an SD memory card that allows up to 512 GB. The Galaxy M51 counts with a superior battery duration than HTC One M9, because it has 7000mAh of battery capacity.
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