Blit - Big files, moved fast, proven intact

My work depends on moving large files between servers in other countries and my own drives, and production waits until they arrive. I used Transmit and ForkLift for years, and they're good apps, but they move a big file over one connection, and over a long distance one connection can't use a fast line. Blit started with one question: could those files move faster?

They can. From a server 148 ms away, Blit downloads a big file up to 278% faster than the fastest Mac app I measured, and up to 769% faster than stock sftp, and it checks every file it moves. The gain is largest when the server is far away and your connection is fast.

• Each file is split across 3 connections, and transfers resume after a dropped connection, sleep or a quit.
• Every file is checked by SHA-256 at its destination. The server computes its own hash, and copies to a NAS are checked by running sha256sum on the NAS, so the check reads the NAS's disk, not the Mac's cache. A file gets its real name only after the hashes match.
• Choose a folder on your server, and Blit copies each new download once it's finished. If the server runs qBittorrent, Blit reads its records, so a download stuck at 43% is never fetched, and each item shows its status.
• A two-pane browser with tabs (F5 copies, F6 moves), Rename N Items with presets, and a pixel-terminal display for transfers.

There's no account and no analytics, and your files go only between your servers, your Mac and your NAS. It's $19 once for 3 Macs, with 7 days free on each.

I'd like to hear from anyone who moves big files over long distances: what's missing, and which servers cause it problems.