Realme C21Y runs Android 10-based Realme UI. It features a 6.5-inch HD+ (720×1,600 pixels) display that has an 88.7 percent screen-to-body ratio and 400 nits of peak brightness. Under the hood, the phone is powered by an octa-core Unisoc T610 SoC paired with a Mali-G52 GPU. Realme C21Y is offered with up to 4GB of LPDDR4x RAM and up to 64GB of internal storage that is expandable via a microSD card through a dedicated slot.
For photos and videos, the Realme C21Y packs a triple rear camera setup that includes a 13MP primary sensor with an f/2.2 lens, a 2MP black and white sensor with an f/2.4 lens, and a 2MP macro shooter with an f/2.4 aperture. At the front, there is a 5MP selfie shooter with an f/2.2 aperture housed in a notch.
For connectivity, the Realme C21Y comes with LTE, Wi-Fi, Bluetooth v5, GPS, a 3.5mm headphone jack, and a Micro-USB port for charging. There is a fingerprint scanner on the back. The phone is backed by a 5,000mAh battery that supports reverse wired charging.
Realme C21Y is priced at VDN 3,240,000 (roughly Rs. 10,500) for the 3GB RAM + 32GB storage model and VDN 3,710,000 (roughly Rs. 12,000) for the 4GB + 64GB model. The phone is offered in Black Caro and Caramel Green colors. It is available for purchase in Vietnam via major online retailers. As of now, Realme has not shared any information on the availability of the Realme C21Y in India and other regions.