The Krunker community generally distinguishes between "custom clients" and "hacker clients":

If you're looking to improve your gameplay without risking a ban,

For a better understanding of legitimate performance clients versus the risks of cheating, check out these community reviews and guides: INSANE Krunker Mods That Will Change Your Game Forever! YouTube · Benitto This NEW Krunker Client is INSANE... (NXT Client Review) YouTube · Benitto THE BEST CLIENTS FOR KRUNKER! (MAX FPS) YouTube · Benitto