Cozoy D2 vs TRUTHEAR ZERO:BLUE2: 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.

Wired IEMs

Cozoy D2

81Outstanding

$55

Full review data

Wired IEMs

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
TRUTHEAR ZERO:BLUE2

HearWiki score

Sound

8.5

7.6

Value

9.0

8.1

Price (USD)

$55

$59

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

Cozoy D2 (2026) against TRUTHEAR ZERO:BLUE2 (2025). These are 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.

D220261 yr newer
ZERO:BLUE22025

Specifications

D2ZERO:BLUE2

Type: Wired IEMs; Wired IEMs
Price (USD): $55; $59
HearWiki score: 81; 78
Released: 2026; 2025
Availability: Sold new; 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 - 41 kHz
Impedance: 20 Ω; 5.8 Ω
Sensitivity: -; 119.5 dB/mW
Sensitivity (dB/Vrms): -; 119.5
Active noise cancelling: -; No
Detachable cable: -; Yes
USB-C: -; No
Connector: 2-pin 0.78 mm; 3.5 mm

Specification comparison of Cozoy D2 vs TRUTHEAR ZERO:BLUE2
Spec	Cozoy D2	TRUTHEAR ZERO:BLUE2
Type	Wired IEMs	Wired IEMs
Price (USD)	$55	$59
HearWiki score	81 / 100 Outstanding	78 / 100 Great
Released	2026	2025
Audio
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 - 41 kHz
Impedance	20 Ω	5.8 Ω
Sensitivity	-	119.5 dB/mW
Sensitivity (dB/Vrms)	-	119.5
Features
Active noise cancelling	-	No
Design
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

TRUTHEAR ZERO:BLUE2

The TRUTHEAR ZERO:BLUE2 is a budget-friendly wired IEM with a dual 10mm dynamic driver setup, offering a spacious soundstage and solid sub-bass. Its engineering focuses on efficiency and performance, though its tuning may not suit every listener, and its fit can be picky about tips. It represents a clear step up from its predecessor in build and distortion control, making it a strong value for its price.

Pro:Powerful sub-bass and good instrument separation
Pro:Dual-driver design with improved engineering
Pro:Detachable cable and competitive price

Con:Midrange can sound thin, with less lively vocals
Con:Upper treble may be sharp for some listeners
Con:Bass can be excessive, and foam tips are needed for best tuning

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 comparison Cozoy D2 TRUTHEAR ZERO:BLUE2