Both are lossless formats — meaning identical sound quality. The real differences are compatibility and ecosystem.
FLAC: universal standard.
ALAC: Apple-friendly.
Sound quality: identical.
Both FLAC and ALAC are lossless, meaning they preserve the exact original audio data. The choice is about compatibility, not quality.
FLAC: general use, cross-platform.
ALAC: Apple devices and iTunes workflows.
| Feature | FLAC | ALAC |
|---|---|---|
| Audio quality | Lossless (identical to source) | Lossless (identical to source) |
| Compatibility | Very wide (many apps/devices) | Best within Apple ecosystem |
| File size | Similar | Similar |
| Open vs proprietary | Open format | Originally Apple, now open source |
| Best use case | Music libraries, archiving | Apple Music / iTunes workflows |
Both FLAC and ALAC reproduce the original audio perfectly. If two files come from the same source, they will sound identical.
FLAC is widely supported across platforms, players, and devices. It is often the default choice for lossless audio outside Apple systems.
ALAC integrates smoothly with Apple software and devices, making it convenient for users in that ecosystem.
This is not a quality decision. It is a compatibility and workflow decision.