Zip, RAR, 7-Zip o 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 non comprime byte. Decodifica l'audio, lo ricodifica senza perdite (FLAC per l'integer, WavPack per il float), elimina take e bounce ripetuti tra i file e ricostruisce un gemello esatto dall'altra parte — controllato campione per campione con SHA-256.

A confronto

 ZipRAR7-ZipCrate
Capisce l'audio———Sì
Dimensione compressa, quota rispetto all'originale45.2%30.9%35.1%25.2%
Dimostra che la copia è al bit———SHA-256
Elimina le take duplicate tra i file——parzialeSì
Apre un archivio rilasciato e comprime l'audio al suo interno———Sì
Divide in volumi adatti all'upload—SìSìSì
Dati di recupero per trasferimenti instabili—Sì—Sì
Gratis da aprire per chi riceveSìSìSìSì
I file lasciano mai il tuo computer?nononono

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.

Il benchmark

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.

Perché esiste questo divario

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.

È anche per questo che Crate può essere onesto sull'essere lossless: «lossless» non è una promessa sulla confezione, è un controllo SHA-256 su ogni file, ogni volta.

Quando uno zip va benissimo

Se stai inviando un paio di MP3, un PDF o una cartella di codice, usa lo zip: è ovunque e il risparmio non conterebbe. Crate si guadagna il suo posto nel momento in cui sposti una sessione vera: tante tracce, WAV grandi, una connessione lenta o costosa e una scadenza che non sopravvive a un upload corrotto.

Scaricare e ricevere è gratis. $25 una tantum per comprimere — nessun account, mai.