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Cozoy D2 vs HZSOUND Heart Mirror Pro: 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 4 measures.

  • Cozoy D2
  • HZSOUND Heart Mirror Pro
HearWiki score
81
69
Sound
8.5
7.0
Value
9.0
6.1
Price (USD)
$55
$80

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 4 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 4 years between them, that is a thin return - treat this as a restyle rather than a new platform.

  • D220264 yr newer
  • Heart Mirror Pro2022

Specifications

D2Heart Mirror Pro
Type
Wired IEMs
Wired IEMs
Price (USD)
$55
$80
HearWiki score
81
69
Released
2026
2022
Availability
Sold new
Still sold new
Driver
2DD
-
Driver type
dynamic
-
Driver configuration
2DD
-
Drivers per side
2
-
Impedance
20 Ω
-
Connector
2-pin 0.78 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

HZSOUND Heart Mirror Pro

The HZSOUND Heart Mirror Pro is a wired in-ear monitor featuring a single 10 mm dynamic driver with a carbon nanotube diaphragm and a detachable 0.78 mm 2-pin cable. It delivers a warmer, bass-forward sound profile compared to its predecessor, making it a solid choice for casual music enjoyment. This model does not include active noise cancellation, so it relies on passive isolation from its fit.

  • Pro:Warm, bass-rich tuning
  • Pro:Replaceable 2-pin cable
  • Pro:Single dynamic driver for coherent sound
  • Con:No active noise cancellation
  • Con:Bass-heavy tuning may not suit purists
  • Con:Requires a source with a headphone jack

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 D2HZSOUND Heart Mirror Pro