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Cozoy D2 vs HZSOUND HEART MIRROR: 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
  • HZSOUND HEART MIRROR
HearWiki score
81
63
Sound
8.5
6.9
Value
9.0
6.4
Price (USD)
$55
$49

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 6 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 6 years between them, that is a thin return - treat this as a restyle rather than a new platform.

  • D220266 yr newer
  • HEART MIRROR2020

Specifications

D2HEART MIRROR
Type
Wired IEMs
Wired IEMs
Price (USD)
$55
$49
HearWiki score
81
63
Released
2026
2020
Availability
Sold new
Discontinued
Driver
2DD
10 mm dynamic
Driver type
dynamic
dynamic
Driver configuration
2DD
-
Driver size
-
10 mm
Drivers per side
2
-
Impedance
20 Ω
32 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

The HZSOUND Heart Mirror is a wired, budget-friendly IEM featuring a 10mm dynamic driver and a neutral-bright tuning that prioritizes vocal clarity and natural timbre over heavy bass. Its balanced, reference-leaning sound makes it a solid pick for monitoring-style listening, though achieving the best seal may require experimenting with different ear tips. With strong build quality and impressive value, it appeals to those who favor a clean, articulate presentation over a fun, V-shaped signature.

  • Pro:Neutral-bright tuning with excellent vocal clarity
  • Pro:Natural timbre and clean presentation
  • Pro:Strong build quality for the price
  • Con:Fit and seal can be finicky, requiring tip rolling
  • Con:Not for listeners who want heavy bass or a V-shaped sound

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