Skip to content

Demystifying Lossless Audio: ALAC vs FLAC Codecs Compared

Hi there! If you‘re an audiophile like me, you may have come across two popular lossless audio formats – ALAC and FLAC. Both promise CD-quality or better sound while taking up less space than uncompressed audio.

But you might be wondering – what exactly is the difference between Apple‘s ALAC and FLAC? Do you need to choose one over the other? Will it make any difference to your listening experience?

In this comprehensive guide, I‘ll give you a detailed comparison of ALAC and FLAC, so you can make sense of these two ubiquitous lossless standards. I‘ll cover everything from technical design, compatibility, sound quality, platform support and more.

Let‘s dive in!

What Are ALAC and FLAC Exactly? A Quick Intro

First, a quick primer on what ALAC and FLAC are.

ALAC stands for Apple Lossless Audio Codec. As the name suggests, it was developed by Apple in 2004 specifically for use within their iTunes platform and iOS devices.

FLAC stands for Free Lossless Audio Codec. It was simultaneously created in 2001 by Josh Coalson as an open source lossless format free for anyone to implement.

Both ALAC and FLAC use compression to reduce audio file sizes by nearly 50% without losing any information. This gives you all the perks of smaller files with no audio quality penalty.

But beneath the surface, ALAC and FLAC have some meaningful technical differences that impact their performance and compatibility. Let‘s look under the hood…

Technical Design Comparison

Here‘s an in-depth look at how ALAC and FLAC differ in their core technical design:

Audio Codec ALAC FLAC
Compression Lossless Lossless
Average Compression Ratio 36-46% 50-60%
Supported Bit Depths 16-bit 16-bit, 24-bit
Sampling Rate Range 44.1kHz – 192kHz 1Hz – 655kHz
Compression Algorithm Prediction-based Linear prediction
Encoding Complexity Faster Slower
Metadata Support ID3 tags FLAC metadata blocks

Let‘s analyze some of the key technical differences:

  • Compression efficiency – FLAC has marginally better compression ratios averaging 50-60% versus ALAC‘s 36-46%. So FLAC files can be about 10-15% smaller for the same audio source.
  • Bit depth – FLAC supports up to 24-bit depth allowing a larger dynamic range and headroom compared to ALAC‘s 16-bit limitation.
  • Sampling rate – FLAC handles exceptionally high sampling rates over 300kHz. ALAC only goes up to 192kHz.
  • Encoding complexity – ALAC‘s prediction-based algorithm is faster than FLAC‘s linear prediction during encoding. But FLAC decoding is equally fast.
  • Metadata support – Both contain metadata, but FLAC‘s flexible structure facilitates more metadata types.

ALAC vs FLAC technical comparison

In essence, FLAC has some technical advantages from an audio purist standpoint. But are those benefits actually audible in practice? Let‘s explore that next…

Sound Quality Comparison

This is arguably what you most care about – how ALAC and FLAC compare in terms of sound quality:

The fact is, both formats are capable of perfectly preserving CD-quality 16-bit/44.1kHz audio without any perceptible loss of fidelity. During double-blind listening tests between ALAC and FLAC, even seasoned audiophiles struggle to tell which is which.

So for ordinary listening purposes, consider them functionally identical in terms of quality. The only time FLAC‘s superior technical specs manifest noticeably is on super high-end audio systems beyond $10,000. We‘re talking ultra-exotic setups far past normal human hearing range!

On consumer-grade gear, even die-hard audiophiles will likely not hear any meaningful difference between well-encoded ALAC and FLAC files. Both will blow away lossy formats like MP3.

Now with that said, FLAC‘s support for higher than 16-bit depth & sampling can provide a more "future-proof" format if you envision upgrading to ridiculously high-end equipment. ALAC may become the limiting link in extreme scenarios demanding the absolute highest fidelity. But that‘s a rather exotic edge case for most listeners!

The reality for most people is ALAC and FLAC both sound incredible to our humble human ears. Let‘s move on to their compatibility and support across devices…

Platform Compatibility Compared

I know you may be wondering – can I play ALAC or FLAC files on my devices? Here‘s a breakdown:

ALAC vs FLAC compatibility


  • Fully supported by all Apple devices – iPhone, iPad, Mac, etc. Integrates seamlessly with iTunes.
  • Limited compatibility on other platforms. Requires conversion for optimal support.


  • Widely supported natively on Android, Windows, Linux, and most audio players.
  • Supported on macOS through apps like VLC, but no iTunes support.

The key takeaway is that ALAC works flawlessly within Apple‘s ecosystem, while FLAC offers much wider cross-device compatibility on both mobile and desktop platforms.

Neither format is inherently "better" – it just depends on which devices you personally use most when listening to music. For Apple loyalists, ALAC makes the most sense. For multi-platform flexibility, FLAC is hard to beat.

Now let‘s go over some ways to actually acquire ALAC and FLAC music files…

Obtaining ALAC and FLAC Music

Once you know which format you want, here are some ways to get ALAC or FLAC music:

  • Buy from online stores – Sites like HDtracks offer huge lossless music catalogs in both ALAC and FLAC. Expect to pay a small premium over MP3s.
  • Rip CDs – Software like XLD (ALAC) and DBpoweramp (FLAC) can rip CDs to respective lossless files.
  • Convert existing audio – Use a tool like XLD or ffmpeg to convert MP3, AAC, WAV to your desired format.
  • Download from torrents – Many audiophile torrent trackers like RED provide extensive lossless music in both ALAC and FLAC.

For buying music, choose the format that best matches your playback devices. For ripping or converting your own library, you can go with either format.

The process of obtaining lossless audio is the same, regardless if you prefer ALAC or FLAC. The only difference is the final format you encode or download your music in.

Recommendations: Should You Use ALAC or FLAC?

So in summary – which lossless format is right for you? Here are my recommendations:

  • If you exclusively use Apple devices – stick with ALAC for seamless iTunes & iOS integration.
  • For the most flexibility across all platforms – FLAC can‘t be beat. It‘s the most versatile lossless codec.
  • Audiophiles may prefer FLAC for its bleeding-edge specs, unless Apple integration is absolutely required.
  • Those with limited storage may want FLAC for its greater compression efficiency to save space.
  • For typical listening on any mainstream gear, ALAC and FLAC will sound indistinguishably perfect so take your pick!

The most important thing is that both formats deliver outstanding lossless quality. Evaluate your personal needs, then choose the right codec that fits your listening lifestyle.

I hope this detailed ALAC vs FLAC comparison has helped demystify lossless audio! Let me know if you have any other questions.

Happy listening!