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Cozoy D2 vs Hidizs ST2 PRO Nebula: 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 4 of 5 measures.

  • Cozoy D2
  • Hidizs ST2 PRO Nebula
HearWiki score
81
71
Sound
8.5
6.9
Calls
-
5.4
Value
9.0
8.2
Price (USD)
$55
$65

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 2 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.

  • D220262 yr newer
  • ST2 PRO Nebula2024

Specifications

D2ST2 PRO Nebula
Type
Wired IEMs
Wired IEMs
Price (USD)
$55
$65
HearWiki score
81
71
Released
2026
2024
Availability
Sold new
Still sold new
Driver
2DD
10 mm dynamic
Driver type
dynamic
dynamic
Driver configuration
2DD
-
Driver size
-
10 mm
Drivers per side
2
1
Frequency response
-
20 Hz - 40 kHz
Sound signature
-
neutral-warm
Impedance
20 Ω
32 Ω
Sensitivity
-
108 dB/mW
Active noise cancelling
-
No
ANC type
-
none
Transparency mode
-
No
Companion app
-
No
Custom EQ
-
No
Wear detection
-
No
Controls
-
buttons
Weight
-
7 g
Detachable cable
-
Yes
USB-C
-
Yes
Connector
2-pin 0.78 mm
2-pin 0.78 mm
Microphones
-
1

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

Hidizs ST2 PRO Nebula

The Hidizs ST2 Pro Nebula is a budget-friendly wired USB-C earphone built around a single 10mm dynamic driver, offering a lively and energetic sound signature with pronounced bass. It's designed for everyday convenience with an integrated DAC cable and simple button controls, making it a solid choice for beginners seeking an engaging listen on the go. However, its tuning may not appeal to those wanting a perfectly neutral or reference-style response, and its passive isolation is modest.

  • Pro:Engaging, bass-forward tuning
  • Pro:Convenient USB-C connection with built-in DAC
  • Pro:Comfortable and lightweight fit
  • Con:Weak passive noise isolation
  • Con:Treble can be uneven or lack smoothness
  • Con:Output may get too loud too easily

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

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New comparisonCozoy D2Hidizs ST2 PRO Nebula