Compare Apple TV 2021
Apple TV 2021 has two variant 4K vs HD

Apple TV 4K 2021
Capacity | 32GB, 64GB |
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Video Output | 2160p, Dolby Vision and HDR10 |
Audio Output | Up to Dolby Digital Plus 7.1 surround sound |
Processor | A8 chip with 64-bit architecture |
Siri Remote (2nd generation) | ✓ |

Apple TV HD 2021
Capacity | 32GB |
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Video Output | 1080p |
Audio Output | Up to Dolby Atmos 360-degree cinema sound |
Processor | A8 chip with 64-bit architecture |
Siri Remote (2nd generation) | ✓ |