Short answer: the KZ ZVX. It ranks #264 of 450 in-ear headphones by sound quality, rated 4.0/5, at $19.99; the KZ Castor ranks #297, rated 3.9/5, and costs $20.89, so there is little reason to consider the other one.
Buy the KZ ZVX. It is rated higher for sound quality than the KZ Castor and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| KZ ZVX | KZ Castor | |
|---|---|---|
| Price | $19.99 | $20.89 |
| Ranked | #264 of 450 in In-Ear Headphones | #297 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 74 (median of 17 squig.link measurements, calibrated to AutoEQ) | 73 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.82 dB standard deviation | 2.01 dB standard deviation |
| Tonal Tilt | -0.56 (negative is warmer, positive brighter) | -0.29 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.0 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 2 x dynamic |
| Impedance | 25 ohms | - |
| Sensitivity | 109 dB | 105 dB |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
Related Headphone Comparisons
More top alternatives to KZ ZVX:
- TRN MT1 Pro vs KZ ZVX
- KZ ZSN Pro 2 vs KZ ZVX
- KZ ZVX vs CCA CRA
- KZ ZVX vs Tin HiFi C1
- CCA CRA vs KZ Castor
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Headphones In Full
KZ ZVX: $19.99 Linsoul eBay
Full KZ ZVX review and specifications →
| Released | May 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.82 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 74 (median of 17 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 25 ohms |
| Sensitivity | 109 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.5 dB at 30 Hz) |
| Tonal Tilt | -0.56 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
KZ Castor: $20.89 Amazon eBay
Full KZ Castor review and specifications →
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.01 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 2 x dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 73 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Sensitivity | 105 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.0 dB at 30 Hz) |
| Tonal Tilt | -0.29 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons