KZ ZST

The KZ ZST sounds like a $100 IEM for $25, but the hiss and useless mic keep it from being a true all-rounder. Buy it for music, not for calls.

The sound is the story here. Our database puts it in the 91st percentile for audio, and owners back that up with consistent praise for deep, punchy bass and clear highs. The hybrid driver setup actually earns its keep, the dynamic driver handles low end while the armature keeps vocals and treble crisp. But that hiss is real. Multiple owners report a constant background noise when powered, which kills the vibe for quiet listening sessions. The ANC claim is marketing fluff, it's passive isolation from the silicone tips, not active cancellation.

Against the Soundcore P31i and EarFun Air Pro 4+, the KZ ZST wins on raw sound quality but loses on convenience. Those competitors are wireless with better mics and actual ANC, but they cost more and can't match the ZST's audio detail. The Anker Space A40 is the pick if you need wireless and call quality. The JLab JBuds Pods ANC is more comfortable for small ears. But if you're plugging into a phone or laptop for music only, the ZST beats them all on sound per dollar.

At $20 to $29 USD depending on the vendor, this is a steal for the sound alone. The US listings show a $9 spread, so shop around before you click buy. The cheapest US option gets you 90% of the experience for the lowest price. For pure music listening, this is one of the best budget values we've seen. Just don't expect the mic or noise cancellation to be anything more than checkbox features.

The KZ ZST is a budget IEM that punches way above its price class on sound. You get a hybrid setup with a 10mm dynamic driver and a balanced armature, which is the kind of combo you'd normally pay triple for. The catch? A constant background hiss that owners keep mentioning, and a mic that's basically decorative. If you want pure sound quality for under $30, this is a serious contender. If you need something for calls or gaming chat, keep scrolling.

If you need a reliable mic for calls, gaming, or video meetings, this isn't it. The microphone quality is consistently called out as poor, and the background hiss makes voice chat frustrating. Go get a Soundcore P31i or Anker Space A40 instead, they cost more but actually work for communication. Small ears should also look elsewhere, the bulky fit is a real complaint.

Buy the KZ ZST if you want the best sound quality under $30 and don't care about the mic or wireless convenience. It's a music lover's budget pick, plain and simple. The hiss is annoying but tolerable for most, and the detachable cable means you can upgrade later. Skip it if you need something for calls, gaming chat, or have small ears.