A Cyberduck alternative that does not stop at the transfer.
Mongrel is a Cyberduck alternative for people who already live in databases and shells. Dual-pane S3-compatible storage, FTP, FTPS, SFTP, and SCP sit in one File Manager, next to SSH terminals and 30+ database engines — not in a separate bookmark window.
Windows x64 and ARM64 · macOS Apple silicon · Linux x86-64
// Why you are here
Cyberduck is a great client. It is still only a client.
Cyberduck made S3, FTP, and a long list of cloud bookmarks easy. Mongrel takes the overlapping protocols — S3-compatible object storage, FTP/FTPS, SFTP/SCP — and puts them in the same desktop app as the query and the shell you open next.
// What ships
What you get when transfers share the workbench.
S3 plus classic file protocols
Amazon S3 and S3-compatible stores (Spaces, MinIO, R2, B2, Wasabi) share the File Manager with FTP, explicit and implicit FTPS, SFTP, and SCP.
Dual-pane File Manager
Local and remote panes, Name/Size sort, a non-selectable .. row, drag-and-drop ghosts, a resizable Transfers drawer, and remembered local folders.
SSH terminals in the next tab
SFTP reuses the SSH terminal profile you already configured. Keys, agent auth, and jump hosts are not a second product.
Databases in the same window
Thirty-plus engines sit beside File Transfer, so the dump you just pulled is one click from a query instead of another desktop client.
Prefixes, not pretend POSIX
S3 listings treat prefixes as folders. New Folder writes a prefix marker. Rename is copy-then-delete. There is no chmod, resume, or symlink on objects.
Keychain-held secrets
S3 secret keys, optional STS tokens, FTP passwords, and FTPS key passphrases stay in the OS keychain and never enter Connection Sync or export.
// Side by side
Mongrel vs Cyberduck, feature for feature.
| Capability | Mongrel | Cyberduck |
|---|---|---|
| S3 and compatible APIs | Amazon S3, Spaces, MinIO, R2, B2, Wasabi in File Transfer | Amazon S3 plus many cloud storage connectors |
| FTP, FTPS, SFTP, SCP | Dedicated File Transfer profiles plus SSH SFTP with SCP fallback | FTP, SFTP, and WebDAV bookmarks |
| Consumer and object clouds | S3-compatible object storage only | Azure, GCS, OpenStack, OneDrive, Dropbox, Google Drive, Box, WebDAV |
| Desktop workbench | File Manager plus terminals, 30+ databases, Docker, Kubernetes, API Client | A focused transfer client (Mountain Duck adds a drive letter) |
| Price and license | Commercial; annual plans from $99/year with a free 7-day trial | Free and open source |
// Honest tradeoffs
Where Cyberduck still has the edge.
Cyberduck is free and open source and connects to Azure, Google Cloud Storage, WebDAV, OpenStack Swift, and consumer drives Mongrel does not speak. Keep it when those endpoints matter. Choose Mongrel when S3-compatible storage and classic file protocols belong next to SQL and SSH, not in a second app.
// FAQ
Frequently asked questions.
What is a good Cyberduck alternative?
If you only need a free bookmark-style client for many cloud vendors, Cyberduck remains a strong fit. If transfers sit next to SSH sessions and databases, Mongrel is a Cyberduck alternative that keeps S3, FTP/FTPS, and SFTP in one dual-pane File Manager inside a desktop workbench.
Does Mongrel connect to Amazon S3 like Cyberduck?
Yes. File Transfer → S3 with a blank endpoint uses the SDK regional resolver. Compatible endpoints cover DigitalOcean Spaces, MinIO, Cloudflare R2, Backblaze B2, and Wasabi.
Does Mongrel support OneDrive, Dropbox, or Google Drive?
No. Those connectors are a Cyberduck strength. Mongrel covers S3-compatible object storage and classic FTP/FTPS/SFTP/SCP, not consumer drive APIs.
Does Mongrel support WebDAV or Azure Blob?
No. WebDAV and Azure Blob stay with Cyberduck. Mongrel's object-storage path is the S3 API only.
Can I use Mongrel on Windows, Mac, and Linux?
Yes. Native packages ship for Windows x64 and ARM64, macOS Apple silicon, and Linux x86-64. Cyberduck also covers those platforms; Mongrel adds the workbench around the transfers.
Is Mongrel free like Cyberduck?
No. Mongrel is commercial software with a 7-day trial and no credit card required. Keep Cyberduck when a free transfer-only client is enough.
Related guides and comparisons
S3, FTP, and SFTP beside the rest of the work.
7-day trial. Windows, macOS, Linux. No credit card.