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Share files between devices. They show up as a folder on your computer.

• End-to-end encrypted (post-quantum). The relay cannot read your files.
• On the same network, devices find each other automatically. One click to connect.
• Over the internet, exchange fingerprints once. Save contacts for future sessions.
• Peer files appear as a native folder (FUSE). Open, edit, git clone, anything.
• Works through firewalls. Automatic fallback to an encrypted relay.
• macOS, Linux, Windows. iOS and Android coming soon.
• Open source (MPL-2.0).

Direct Transfer	Virtual Folder (FUSE)
Drag files in. Your peer saves what they need.	Peer files appear as a folder. Open in any app.

Finder	Terminal (git)

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Install

macOS

brew tap keibisoft/keibidrop
brew install keibidrop

Linux (Debian/Ubuntu)

wget https://github.com/KeibiSoft/KeibiDrop/releases/latest/download/keibidrop_amd64.deb
sudo dpkg -i keibidrop_amd64.deb

Windows

choco install keibidrop

Or download from GitHub Releases.

Build from source

git clone https://github.com/KeibiSoft/KeibiDrop.git
cd KeibiDrop
make build-kd       # CLI daemon
make build-cli      # Interactive CLI
make build-rust     # Desktop UI (needs Rust + Slint)

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Quick start

Same network (LAN):

1. Both peers launch KeibiDrop
2. Devices discover each other automatically
3. One click to connect
4. Share files

Over the internet:

1. Both peers launch KeibiDrop
2. Copy your fingerprint and send it to your peer (Signal, Telegram, anything)
3. Paste each other's fingerprints and connect
4. Share files

Save a peer as a contact to skip the fingerprint exchange next time. On the same network, saved contacts connect with one click using pseudonyms.

It works through firewalls automatically. If direct connection fails, KeibiDrop falls back to an encrypted relay. No port forwarding, no router configuration.

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Two modes

	Direct Transfer	Virtual Folder (FUSE)
Speed	Up to 550 MB/s	Up to 250 MB/s
How it works	Add files, peer pulls them	Peer's files appear as a local folder
Setup	Nothing extra	Install macFUSE, fuse3, or WinFsp
Best for	Sending large files	Working on shared files, git repos

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How it works

1. Peers exchange fingerprints (or discover each other on LAN)
2. KeibiDrop finds the fastest path: LAN, direct IPv6, or encrypted relay
3. Files transfer over an encrypted channel the relay cannot read
4. Keys rotate automatically for forward secrecy

The encryption is post-quantum (ML-KEM-1024 + X25519) with AES-256-GCM or ChaCha20-Poly1305. Full protocol details in Security.md.

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Three interfaces

Desktop UI (Rust/Slint)

./keibidrop

Interactive CLI (terminal REPL)

./keibidrop-cli

Agent CLI (for scripts and AI agents, all output is JSON)

./kd start                           # Start daemon
./kd show fingerprint                # Get your fingerprint
./kd register <peer-fingerprint>     # Register peer
./kd create                          # Create room (or: kd join)
./kd add /path/to/file.zip           # Share a file
./kd list                            # List shared files
./kd pull file.zip ~/Downloads/      # Download a file

See docs/kd-agent-guide.md.

Configuration

KeibiDrop reads ~/.config/keibidrop/config.toml. Environment variables override the config.

Setting	Env var	Default
Relay server	KD_RELAY	https://keibidroprelay.keibisoft.com/
Bridge relay	KD_BRIDGE	bridge.keibisoft.com:26600
Save folder	KD_SAVE_PATH	~/KeibiDrop/Received/
FUSE mount	KD_MOUNT_PATH	~/KeibiDrop/Mount/
Inbound port	KD_INBOUND_PORT	26431
Disable FUSE	KD_NO_FUSE	false

Security

Post-quantum hybrid key exchange prevents future quantum computers from decrypting recorded traffic. Forward secrecy via periodic re-keying limits exposure if a session key is ever compromised.

By default, identity is ephemeral: a fresh keypair each session, anonymous, unlinkable. For ease of use, you can save persistent identities encrypted with a per-install master key stored in the OS keychain (macOS Keychain Services, Linux Secret Service, Windows Credential Manager). Headless setups fall back to ~/.config/keibidrop/.master.key (mode 0600). Optional passphrase protection via Argon2id for users who back up config to the cloud.

Full protocol description: Security.md

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Troubleshooting

See TROUBLESHOOTING.md.

Contributing

See CONTRIBUTING.md.

License

Go engine, CLI, and mobile bindings: Mozilla Public License 2.0 (per-file copyleft)

Rust UI and brand assets: Proprietary - see DUAL-LICENSE.md

Desktop UI built with Slint

Built by KeibiSoft SRL.

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Links

• Website
• Technical deep dive
• Blog posts (22 posts on FUSE, crypto, performance)
• FAQ
• Comparison with alternatives