Zip、RAR、7-Zip，还是 Crate？

General-purpose zippers were built for documents and code. They do shrink an audio session — and then they stop, because a waveform is a wall of random bytes to them. Crate was built for one job: moving audio sessions. It reads the stems, packs them to roughly half the size of a zip, and proves every byte arrived perfectly.

Try it yourself: take a finished multitrack session, zip it, then pack it with Crate. Across the twenty real client sessions in our benchmark, the zip came out between 1.38 and 2.46 times the size of the .crate package. The zip is not doing nothing — it saved a median of 51.5% (per-session range 15–88%). It simply runs out of things to find, because a byte-level compressor never sees the waveform underneath.

Crate 压缩的不是字节。它解码音频，无损重新编码（整数用 FLAC，浮点用 WavPack），对跨文件重复的 take 和导出片段去重，并在另一端重建一个分毫不差的副本 — 用 SHA-256 逐样本核对。

并排对比

	Zip	RAR	7-Zip	Crate
读得懂音频	—	—	—	是
打包后体积，占原工程的比例	45.2%	30.9%	35.1%	25.2%
证明副本逐位完美	—	—	—	SHA-256
跨文件对 take 去重	—	—	部分支持	是
打开拖入的压缩包，并对其中的音频进行打包	—	—	—	是
分割成适合上传的分卷	—	是	是	是
为不稳定传输提供恢复数据	—	是	—	是
接收方免费打开	是	是	是	是
文件会离开你的机器吗	否	否	否	否

Percentages are the packed size as a share of the original session — lower is smaller. Figures are pooled across the eleven mixed sessions of the current benchmark, every archiver at its strongest setting (zip -9, RAR -m5 -s -md1g, 7-Zip -mx=9, Crate on Smallest), every result restored and compared byte for byte. Per-session ranges are wider — the Impact page carries them lane by lane.

基准测试

One run, one machine, nothing else running. Twenty real client sessions — mixed, loop-heavy, stem exports and dense live recordings — each packed by Crate on both of its presets and by ten other archiver configurations set for maximum compression, every run restored and compared byte for byte. Sessions are pooled into four material classes so no one session can stand in for the rest. The full tables are on the Impact page, engine by engine.

1.38–2.46×

the size of a zip of the same session, across all twenty measured

5.5–8.8×

faster to pack than RAR at maximum settings, on the pilot corpus measured at these documented settings

72%

typical reduction on a session of 1 GB or more, across 301 production packs

The ranges overlap because the sessions differ, not because the engines do — every engine packed the same twenty sessions. Pooled on the mixed-class lane, the zip came out 1.79 times the size of the .crate package. Same files, same machine, same clock.

差距为何存在

A zipper looks for repeated byte patterns, and a session does hold some: headers, long stretches of silence, whole files that appear twice. That is worth the 15 to 88% a zip finds on audio sessions — about half, at the median — and then the search is over, because the low bits of a 24-bit WAV are noise to it. Crate instead does what an audio engineer would: it reads the actual waveform, stores it in a lossless audio codec, notices when two tracks are the same take (on by default) and — on the Smallest preset — when a bus is the sum of its stems, keeping only what's unique. Then it reassembles a byte-identical copy and proves it.

这也是 Crate 敢于坦白说自己无损的原因：「无损」不是包装盒上的一句承诺，而是对每个文件、每一次都做的 SHA-256 校验。

什么时候用压缩软件就够了

如果你只是发几个 MP3、一个 PDF 或一个代码文件夹，那就用 zip — 它无处不在，省下的那点体积也无所谓。但当你搬动一个真正的工程时，Crate 才显出价值：轨道众多、WAV 庞大、网络又慢又贵，还有一个经不起上传损坏的截止期限。

免费下载 Crate 了解工作原理

下载和接收都免费。打包只需一次性 $25 — 永远不用注册账号。