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Cozoy D2 vs KZ ZST: which should you buy?

On aggregated review scores the Cozoy D2 comes out ahead with a HearWiki score of 81. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Cozoy D2 - Outstanding overall at around $55.

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

Cozoy D2 leads on 3 of 4 measures.

  • Cozoy D2
  • KZ ZST
HearWiki score
81
40
Sound
8.5
4.8
Value
9.0
1.3
Price (USD)
$55
$55

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

The Cozoy D2 is 8 years newer, but it is the same generation of hardware: nothing in the radio, the codecs or the noise cancelling separates them. Nothing separates them on convenience features either, so the choice comes down to tuning and price. For 8 years between them, that is a thin return - treat this as a restyle rather than a new platform.

  • D220268 yr newer
  • ZST2018

Specifications

D2ZST
Type
Wired IEMs
Wired IEMs
Price (USD)
$55
$55
HearWiki score
81
40
Released
2026
2018
Availability
Sold new
Still sold new
Driver
2DD
2× 10 mm dynamic
Driver type
dynamic
dynamic
Driver configuration
2DD
-
Driver size
-
10 mm
Drivers per side
2
2
Frequency response
-
20 Hz - 20 kHz
Impedance
20 Ω
18 Ω
Sensitivity
-
120 dB/mW
Active noise cancelling
-
No
Controls
-
buttons
Weight
-
22 g
Detachable cable
-
Yes
USB-C
-
No
Connector
2-pin 0.78 mm
3.5 mm

What reviewers said

Cozoy D2

The Cozoy D2 is a budget-friendly wired IEM that pairs a 6 mm beryllium driver with a 10 mm graphene-composite driver for a dual-dynamic setup. It offers a flexible connection via a 2-pin 0.78 mm cable that includes swappable 3.5 mm and 4.4 mm plugs, catering to both standard and balanced sources. With a 20-ohm impedance, it's easy to drive from most devices.

  • Pro:Dual-driver hybrid design for detailed sound
  • Pro:Interchangeable 3.5 mm and 4.4 mm plugs
  • Pro:Low impedance (20 ohms) for easy pairing
  • Con:No active noise cancellation
  • Con:Wired only, limiting portability
  • Con:Budget build may not suit all users

KZ ZST

The KZ ZST is a budget-friendly wired IEM with a dual dynamic driver setup that delivers a bass-forward, energetic sound. It offers a detachable cable and decent clarity for the price, though its tuning can be uneven with a recessed midrange and occasionally piercing treble. Comfort is generally acceptable, but the build feels basic and long listening sessions may not be ideal for everyone.

  • Pro:Strong bass response with good low-end punch
  • Pro:Detachable cable for easy replacement or upgrades
  • Pro:Good value for the price
  • Con:Recessed midrange can push vocals back in the mix
  • Con:Treble can be harsh or piercing on some tracks
  • Con:Basic build quality

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

Compare something else

Swap either side out, or start again from the picker.

New comparisonCozoy D2KZ ZST