FileFluss

A dual-panel file manager for macOS that lets you conveniently handle files across cloud storage providers.

What FileFluss does

FileFluss puts a left and a right panel side by side. Each panel can show a local folder or a connected cloud account, and the two are independent — even when you have the same cloud account loaded in both panels you can browse to different folders on each side. Drag and drop, copy, move, sync, compare, search — all between the two panels with native macOS performance.

Features

Two independent panels

• Open a different local folder, cloud account, or favourite on each side.
• Same cloud account on both panels? They navigate independently — and dragging between them does an in-cloud move/copy without re-uploading.
• Per-panel sidebar with favourites, locations, and connected cloud accounts.
• Active panel is marked with a thin accent line; toolbar actions and shortcuts target it.

Multi-cloud, in one place

Connect once in Settings → Cloud Accounts and the account appears in both panels' sidebars.

• Google Drive
• Dropbox
• OneDrive (Microsoft)
• Box
• iCloud Drive
• pCloud
• kDrive (Infomaniak)
• Mega (with 2FA)
• Koofr
• Filen (filen.io)
• Internxt (internxt.com — end-to-end encrypted)
• NextCloud
• Seafile
• Synology Drive
• Synology C2
• WordPress (Media Library)
• GMX Cloud (MediaCenter)
• AWS S3
• Generic S3-compatible (Hetzner Object Storage, MinIO, Wasabi, Backblaze B2, Cloudflare R2, DigitalOcean Spaces, …)
• WebDAV
• SFTP

Cloud-to-cloud transfers, Google Workspace files auto-converted to DOCX/XLSX/PPTX on download, modification dates preserved.

• Used / free storage at a glance — most accounts surface their quota in the status bar and as a sidebar tooltip.
• Edit credentials in place from Settings → Cloud Accounts; no need to remove and re-add an account when a password changes.
• Remove from FileFluss as an opt-in context-menu entry on each cloud account in the sidebar.

Mount cloud accounts in Finder

Mount any connected cloud account as a drive in Finder and use it from every app on your Mac — not just inside FileFluss.

• Open a cloud document straight into Word, Preview, or Photos; attach files from any Save/Open dialog; drag into Mail.
• Mount and unmount from the sidebar, with a one-click Reveal in Finder.
• A local read cache makes reopening files instant, and mounts are cleaned up on quit.

Offline Mode & offline search

Index any connected cloud account once and you keep browsing — and searching — even when you're offline.

• Right-click an indexed cloud account in the sidebar → Go Offline / Go Online to flip the flag on the fly.
• Offline accounts serve their cached file tree from the local search index, so file names and folder structure stay available without a connection.
• Universal search (⌘F) covers every connected cloud account and indexed drive at once, including offline accounts.

Index Status

Settings → Index Status lists every indexed source with last-indexed date, file and folder counts, total bytes, and a per-source refresh button. Renames in the sidebar are reflected here immediately; removing an account drops its indexed rows so they don't linger.

Customizable keyboard shortcuts

Settings → Keyboard lets you remap every common file-manager command. Pick one of three presets — Finder-like, Total Commander, or Norton Commander — or build your own. Single keys (F5 to copy, F6 to move) or full modifier chords (⌘C / ⌃X) are all supported.

Cache management

Settings → Storage shows a live cache size and offers a one-click Clear. Optional auto-management on launch prunes entries older than N days, then enforces a size cap. Slider + numeric field for the max size, and a separate slider for auto-delete age.

Drag & drop, with shortcuts

• Drop files between panels — a Move or Copy? prompt asks once.
• Drop directly onto a folder row, the table background, or any breadcrumb in the path bar — files land where you expect.
• Right-click → Copy to Other Panel / Move to Other Panel for the no-prompt version.
• Side-by-side conflict resolution dialog with newer/older labels and Apply-to-All.

Copy Mode and Move Mode

Two toolbar toggles for when you're in the flow and don't want the Move or Copy? prompt every time:

• Copy Mode forces every drag & drop to copy.
• Move Mode forces every drag & drop to move.

Mutually exclusive, and both reset on relaunch so a stuck Move Mode can't quietly destroy files across sessions.

Sync

Make one folder match another — local↔local, local↔cloud, or cloud↔cloud.

• Newer — copy files that are newer on the source.
• Mirror — make the destination identical, including deletes (with explicit confirmation).
• Additive — only copy files that are missing; never overwrite.

A pre-flight plan shows file counts, total bytes, and direction before a single byte moves. Byte-weighted progress so a single large file doesn't stall the bar. Cancel any transfer with confirmation.

Compare Folders

A non-destructive side-by-side diff of two folders.

• Color-coded statuses: Different, Only on Left, Only on Right, Identical.
• Collapsible folders — a folder that exists only on one side, or contains many differing files, shows a single summary row that you expand to drill in.
• Filter chips narrow to one status (e.g. show only differences).
• Compare Date — opt-in checkbox flagging files whose size matches but modification date differs, with both modify and create timestamps and a Left newer / Right newer badge.
• Compare Again — runs against the panels' current folders. Browsing the panels while the compare window is open does not retrigger the scan, so no surprise re-enumerations of cloud trees.
• The compare window is movable and resizable, so you can keep both panels visible behind it.

Universal search

Search the active local folder and every connected cloud account at once.

• Press ⌘F or click Search in the toolbar.
• Results stream in per source as each one responds.
• Double-click a result to navigate the active panel to its folder.
• Right-click to open a result explicitly in the Left or Right panel — the search window stays open so you can pick more.
• Movable, resizable window; size and position remembered across launches.

Open files like local

• Double-click a file in any panel — local or cloud — and it opens in the system default app (Word, Preview, Photos, etc.).
• Cloud files are downloaded to a temp cache the first time, so reopening is instant.
• Quick Look with Space, just like Finder.
• Local image and PDF rows show a real Quick Look thumbnail of the file content; cloud files show a colourful generic icon based on the extension.

Other niceties

• Folder size calculation in the background, never blocking the UI.
• Favourites pin frequently-used local and cloud folders to the sidebar — drag any folder onto Favorites with a row-reorder-style insertion indicator.
• Independently resizable sidebars, each collapsible to an icon-only mode.
• Finder-style row size toggle (View → row size, or ⌘+ / ⌘-).
• Auto-Resize Name column toggle per panel (right-click the Name column header).
• Hidden-files toggle per panel.
• Customisable toolbar (right-click → Customize Toolbar…).
• Light/Dark app icon variants — the dock icon swaps live when macOS toggles appearance.
• Built-in FileFluss Help under the Help menu (⌘?).

Requirements

• macOS 14.0 (Sonoma) or later

Installation

Homebrew (recommended)

brew install --cask rana-gmbh/filefluss/filefluss

This auto-taps rana-gmbh/filefluss and installs the cask in one step. To upgrade later: brew upgrade --cask filefluss.

Manual

Download the latest DMG from the Releases page and drag FileFluss.app into your Applications folder.

Building from source

FileFluss uses XcodeGen to generate the Xcode project.

brew install xcodegen
xcodegen generate
xcodebuild build -project FileFluss.xcodeproj -scheme FileFluss -destination 'platform=macOS'

Credits

• App icon (Light & Dark variants) — thanks to @JohnnyFireOne.
• File-type icons — redbooth/free-file-icons, © 2009 Teambox Technologies, S.L. (MIT License).

Support

If you want to support the FileFluss project, please consider buying me a coffee.

License

FileFluss is released under the GNU General Public License v3.0.

Copyright © 2026 Rana GmbH.