A copy on every device, or only the bytes you open.
Resilio Sync keeps a full copy of a folder on every device that joins it, over a peer to peer link with no account. Selective sync, where a file is fetched when you ask for it, is in the paid Pro tier, and the source is closed. KEIBIDROP mounts the other machine's folder, so the second machine holds only the bytes you open, and the engine is MPL-2.0.
| KEIBIDROP | Resilio Sync | |
|---|---|---|
| Disk used on the second machine | Only what you open | A full copy, or selective sync in the Pro tier |
| Time before you can work | Immediate, it mounts | After the sync finishes |
| Open a file without copying the folder | Yes | With the Pro tier's selective sync |
| Both peers online | Required | Not required |
| Many devices | Two per share | A fleet |
| Account | None | None |
| NAS | A container image | Packages for the major NAS brands |
| Encryption | End to end, X25519 with ML-KEM-1024 | Encrypted between peers |
| Source code | Open, MPL-2.0 | Closed |
A sync tool copies the whole folder before the second machine can work, and keeps copying as the folder changes. KEIBIDROP mounts the folder, so a read pulls only the bytes it touches and the second machine holds only the files you opened. Resilio Sync copies the whole folder to every device by default and offers on-demand files in its Pro tier.
KEIBIDROP's engine is MPL-2.0 on GitHub, so anyone can read how the key exchange and the mount work. Resilio Sync is closed source.
KEIBIDROP mounts the other machine's folder as a folder on yours, and a read pulls only the bytes it touches, so you open the one file you came for instead of receiving a whole directory. It is a real filesystem, so Premiere, Resolve, Blender, grep and git open a path on it the way they open a local one.
Not with KeibiDrop: it mounts the folder and pulls only the bytes you open. Resilio Sync keeps a full copy unless you pay for selective sync.
KeibiDrop's engine is MPL-2.0 on GitHub. Resilio Sync is closed source.
No. KeibiDrop joins two machines that are both running. Resilio Sync catches up when a device returns, and for that shape of work a sync tool is the right choice.