Peer-to-peer file sync with zero central storage. No corporation holds your data. Your backup payments go to real people, not big tech.
File sync that works how you expect, built on infrastructure you can trust.
Files transfer directly between your devices over encrypted gRPC connections. No cloud middleman stores or routes your data.
Grass Drive appears in your Windows Explorer sidebar via Cloud Files API. Sync status overlays, drag-and-drop — just like OneDrive, but yours.
Right-click any folder to share with contacts. Invitation by email, manage active, pending, and sent shares from the app.
Every version of every file is kept for 30 days. Made a mistake? Restore any previous version with one click.
Deleted files go to a 30-day trash. Recover accidentally deleted files or let them expire automatically.
Version vectors detect concurrent edits across peers. Both copies are kept with clear naming so you never lose work.
Choose which folders sync to which devices. Changes made offline queue up and sync automatically when you reconnect.
Chunked transfers with automatic resume. Connection drops mid-transfer? It picks up exactly where it left off.
Military-grade encryption at every layer. Your files are protected at rest, in transit, and in backup — by design, not by policy.
Each device gets a unique Ed25519 key pair. Peer ID is derived from SHA-256 of the public key — cryptographically verifiable, unforgeable.
Every peer-to-peer connection is authenticated in both directions. No man-in-the-middle attacks. Both sides prove identity before any data flows.
Backup shards are encrypted before leaving your device. Backup peers store ciphertext they cannot decrypt. Even we can't read your files.
All local metadata is stored in SQLite encrypted with SQLCipher. Even if someone accesses your disk, your sync state is unreadable.
Multi-factor authentication on every login and new device registration. 6-digit code via email with 10-minute expiry.
Your files never touch a corporate server. The coordinator matches peers and issues tokens — it never sees, stores, or routes your actual data. When you pay for backup, that money goes to real people contributing storage, not big tech.
Your file is detected, hashed, synced, compressed, encrypted, erasure-coded, and distributed — in seconds.
FSWatcher monitors your Grass Drive folder in real time. The moment a file is saved, renamed, or deleted, the sync engine wakes up. A 1-2 second debounce coalesces rapid saves into a single event.
A SHA-256 hash is computed for the changed file. Your device exchanges manifests with connected peers — a compact list of file paths, hashes, and version vectors — to determine what needs syncing.
Changed files stream directly to your other devices over gRPC with mutual TLS. Large files are chunked with automatic resume. Bandwidth throttling keeps your connection usable.
For backup, the file is compressed with zstd (60-80% reduction for text) then encrypted with AES-256-GCM using a per-file key derived from your master key. Compression before encryption — because ciphertext is incompressible.
Reed-Solomon 8+8 splits the encrypted file into 16 shards — 8 data, 8 parity. Each shard goes to a different backup peer. Any 8 of 16 shards can reconstruct the original. When a node goes offline, the network automatically replicates its shards to new peers — maintaining full redundancy at all times.
Lost your laptop? Log in on a new device, authenticate with MFA, and Grass Drive gathers 8+ shards from the network. Reconstruct → decrypt → decompress → your original files, restored.
A file is saved, hashed, synced to peers, encrypted, sharded, and distributed — all in real time.
Contribute storage to the Grass Drive network as a backup peer. Store encrypted shards you can never read, earn money for keeping them safe. Every dollar goes to people like you — not a corporation.
Contribute to the network and sync for free. Or pay a flat monthly rate — and every cent goes to the people storing your data, not a tech giant.
Download Grass Drive for Windows and join a network where your data belongs to you — and your money goes to people, not big tech.