Mount any server
in Finder.Online-only by default.
KastDrive turns SMB shares, WebDAV servers, SFTP hosts, and S3 buckets into Finder folders that feel exactly like iCloud Drive. Files appear as cloud icons, download on first open, and stay synced both ways.
First-class Tailscale support. One-click migration from Mountain Duck.$29 once, no subscription, free tier forever.
Free tier: 1 mount, all protocols — no credit card required
Finder-native, iCloud-style UX
Uses Apple's official File Provider Extension API. No FUSE, no kernel extensions, no drama.
Files appear instantly
Remote files show up in Finder with a cloud badge the moment you mount a share — no waiting, no bulk download.
Download on demand
Double-click any file to fetch it on first open. Pin "Always keep offline" for files you need without a connection.
Sync both ways
Edits on your Mac propagate to the server within seconds. Conflicts resolve with readable `.sync-conflict` filenames.
First-class Tailscale support
KastDrive auto-discovers Tailscale peers on your tailnet. Mount your home NAS, office SMB share, or Raspberry Pi from anywhere — no VPN configuration, no port forwarding, no public IP required.
KastDrive vs Mountain Duck
Mountain Duck is excellent software — but it costs more and doesn't integrate with Apple's File Provider API, so files don't stream on demand.
| Feature | KastDrive | Mountain Duck |
|---|---|---|
| Price | $0 free / $29 one-time | $49 + $24.99/yr renewals |
| Finder integration | Native File Provider Extension | FUSE / kernel extension |
| Online-only files | Yes — iCloud-style cloud icons | No — full download required |
| On-demand sync | Yes — opens on first click | No |
| Tailscale support | Built-in peer discovery | Manual host entry |
| Free tier | Yes — 1 mount, forever | No (trial only) |
| SMB / WebDAV / SFTP / S3 | All four | All four |
| macOS Sequoia native | Yes | Partial (FUSE deprecated) |
Mountain Duck pricing as of June 2026. No affiliation with Cyberduck/Mountain Duck.
Your files, exactly where you expect them.
Start free with one mount. Upgrade to Pro for unlimited mounts, bandwidth scheduling, and Cryptomator vaults.