Wireless protocol is where these two earbuds diverge most meaningfully. The QCY Crossky C30S runs on Bluetooth 6, the latest generation of the standard, which brings improvements in connection stability, interference resistance, and power efficiency over the Bluetooth 5.4 found in the EarFun Clip. While both share the same rated 10 m range, real-world reliability in crowded RF environments — busy offices, transit hubs, city streets — tends to benefit from the newer standard.
Codec support tells a split story. Both earbuds include LDAC, Sony's high-resolution audio codec that transmits up to three times the data of standard SBC, making it the standout shared feature for Android users who want near-lossless wireless audio. Beyond that, their codec libraries diverge: the QCY adds AAC, which is the preferred codec on Apple devices and delivers noticeably better audio quality than SBC on iPhones and iPads. The EarFun Clip skips AAC entirely, meaning iOS users fall back to SBC when LDAC is unavailable — a real-world audio quality gap on Apple hardware. In return, the EarFun Clip offers fast pairing, which streamlines the initial setup experience — a convenience the C30S lacks.
On balance, the QCY Crossky C30S has the connectivity edge. Its newer Bluetooth version and AAC support make it the more versatile and future-ready option, particularly for Apple ecosystem users. The EarFun Clip's fast pairing is a useful quality-of-life feature, but it does not offset the codec and protocol advantages of the C30S for most users.