Realme C21Y vs Realme C51
A spec-by-spec comparison of the Realme C21Y and the Realme C51, taken from their full specification sheets. Green marks the better value in each measured row.
Head to head
| Realme C21Y | Realme C51 |
|---|
| Our rating | 7/10 | 7/10 |
| Battery | 5,000 mAh | 5,000 mAh |
| Wired charging | 10W | 33W |
| RAM (max) | 4 GB | 8 GB |
| Storage (max) | 64 GB | 256 GB |
| Screen size | 6.5 in | 6.74 in |
| Refresh rate | — | 90 Hz |
| Main camera | 13 MP | 50 MP |
| Weight (lower is lighter) | 200 g | 186 g |
| Released | Jul 2021 | Aug 2023 |
Summary: Realme C51 is ahead on wired charging, ram (max), storage (max), screen size.
★ Which should you buy? Realme C51 is the stronger overall pick on the measured specs.
Reviewed by the infozme.com Editorial Team — see how we research & rate phones.
Display
| Realme C21Y | Realme C51 |
|---|
| Type | IPS LCD, 400 nits (typ) | IPS LCD, 90Hz, 560 nits (peak) |
| Size | 6.5 inches | 6.74 inches, 109.7 cm2 (~85.5% screen-to-body ratio) |
| Resolution | 720 x 1600 pixels | 720 x 1600 pixels, 20:9 ratio (~260 ppi density) |
| Protection | Unspecified | Corning Gorilla Glass (unspecified version) |
Platform
| Realme C21Y | Realme C51 |
|---|
| OS | Android 10, Realme UI (upgradable to Android 11 in some regions) | Android 13, Realme UI T Edition |
| Chipset | Unisoc T610 (12 nm) | Unisoc Tiger T612 (12 nm) |
| CPU | Octa-core (2x1.8 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55) | Octa-core (2x1.8 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55) |
| GPU | Mali-G52 | Mali-G57 |
Memory
| Realme C21Y | Realme C51 |
|---|
| Card slot | microSDXC (dedicated slot) | microSDXC (dedicated slot) |
| Internal | 32GB 3GB RAM, 64GB 4GB RAM | 64GB 3GB RAM, 64GB 4GB RAM, 128GB 4GB RAM, 128GB 8GB RAM, 256GB 6GB RAM (eMMC 5.1) |
Main Camera
| Realme C21Y | Realme C51 |
|---|
| Triple | 13 MP, f/2.2, 26mm (wide), 1/3.06", 1.12µm, PDAF; 2 MP, f/2.4, (macro); 2 MP, f/2.4, (depth/B&W) | — |
| Features | LED flash, HDR, panorama, Chroma Boost, Night Mode, Panoramic view, Expert, Timelapse, Portrait Mode, Ultra macro, AI Beauty, Filter | LED flash, HDR, panorama |
| Video | 1080p@30fps | 1080p@30fps |
| Dual | — | 50 MP, f/1.8, 27mm (wide), 1/2.76", 0.64µm, PDAF; 0.08 MP (auxiliary/depth sensor) |
Selfie Camera
| Realme C21Y | Realme C51 |
|---|
| Single | 5 MP, f/2.2 (wide) | 5 MP, f/2.2, 28mm (wide), 1/5.0", 1.12µm |
| Features | HDR, panorama, Timelapse, Panoramic view, Beauty Mode, Face-Recognition, Filter | HDR |
| Video | 1080p@30fps | 720p@30fps |
Battery
| Realme C21Y | Realme C51 |
|---|
| Type | Li-Po 5000 mAh, non-removable | Li-Po 5000 mAh, non-removable |
| Charging | 10W wired, Reverse charging | 33W wired, 50% in 28 min (advertised) |
Body
| Realme C21Y | Realme C51 |
|---|
| Dimensions | 164.5 x 76 x 9.1 mm | 167.2 x 76.7 x 7.99 mm |
| Weight | 200g | 186 g |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) |
| Colors | — | Carbon Black, Mint Green |
Comms
| Realme C21Y | Realme C51 |
|---|
| WLAN | Wi-Fi 802.11 b/g/n, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band |
| Bluetooth | 5.0, A2DP, LE | 5.0, A2DP, LE |
| Positioning | GPS, A-GPS, GLONASS, BDS | GPS, GLONASS, GALILEO |
| NFC | Yes (region dependent) | Yes (360-degree enabled, market/region dependent) |
| Radio | FM Radio | — |
| USB | microUSB 2.0, OTG | USB Type-C 2.0 |
Launch
| Realme C21Y | Realme C51 |
|---|
| Announced | July 2021 | 2023, August |
| Status | Available | Available. Released 2023, August |
Frequently asked questions
Which has more RAM, Realme C21Y or Realme C51?
Realme C51 — 4 GB for the Realme C21Y versus 8 GB for the Realme C51.
Which is lighter, Realme C21Y or Realme C51?
Realme C51 — 200 g for the Realme C21Y versus 186 g for the Realme C51.
Which is newer, Realme C21Y or Realme C51?
Realme C51 — Jul 2021 for the Realme C21Y versus Aug 2023 for the Realme C51.
Is the Realme C21Y or the Realme C51 rated higher?
We rate the Realme C21Y 7/10 and the Realme C51 7/10.
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