Alternative & Comparison · Drive mounter
Ultra Explorer vs Mountain Duck
Ultra Explorer is built for bulk work across storages: transfers with history, scheduled synchronizations and space analysis, on macOS, Windows, Linux and Docker.
Ultra Explorer shows two storages side by side and runs every copy and move through a durable queue with progress and history. Pro adds search, space analysis and scheduled synchronizations, and it also runs on Linux and as a web app on your NAS. Mountain Duck, a paid app for macOS and Windows, integrates storages into Finder and File Explorer.
Ultra Explorer
Free, Pro or Lifetime
Free plan includes full dual-pane file management across 40+ clouds, durable transfers, and Docker container. Pro upgrade unlocks Disk Space Analyzer, Synchronizations, and Global Search.
Mountain Duck
Paid license per user and major version (free trial)
Move, synchronize and analyze files between storages.
Feature-by-Feature Matrix
| Feature / Capability | Ultra Explorer | Mountain Duck |
|---|---|---|
| Technology stack Compiled native core: fast startup, low memory use | Rust + Tauri | Java |
| Dual-pane explorer Source and destination shown side by side | Included in Free | Uses Finder / File Explorer |
| Search across several storages at once Any number of storages in parallel, with filters and presets | Pro module | Via the system’s search |
| Synchronization Update or Mirror, preview before running, deletion limit, schedules | Pro module | Smart sync of used files |
| Disk space analysis Local disks and clouds, largest files, breakdown by type | Pro module | No |
| Durable transfer queue Queue and history kept between sessions, one-click retry | Included in Free | Via the system file manager |
| Conflict choice per batch Replace, skip, keep both or cancel, applied to the whole batch | Included in Free | System copy dialog |
| Encryption Files and names encrypted on your machine with rclone Crypt | Included in Free | Via Cryptomator |
| Self-hosted web version For a Synology, QNAP, TrueNAS or Unraid NAS | Included in Free | No |
| Platforms Desktop and server | macOS, Windows, Linux, Docker | macOS, Windows |
Why switch from Mountain Duck to Ultra Explorer
- 1 Durable queue
Transfers with a history
Every copy and move goes through a durable queue with progress, history and an explicit choice on conflicts.
- 2 Linux + Docker
Linux and Docker
Ultra Explorer runs on macOS, Windows and Linux, and as a web app on your NAS.
- 3 Free version
A free version
Connect and manage all your storages for free; Pro adds search, space analysis and synchronizations.
Under the Hood Architecture
Mountain Duck vs Ultra Explorer Architecture
Mountain Duck Architecture
Integrates storages into Finder and File Explorer, so every application can open remote files.
Ultra Explorer Rust & Svelte 5
Rust core driving a bundled rclone, shared by a Tauri desktop app (macOS, Windows, Linux) and a self-hosted web server (Docker). Transfers, history and synchronization jobs are stored in SQLite.
Technical Verdict For transfers, synchronizations and space analysis across storages, Ultra Explorer is the dedicated tool.
Honest Pros & Cons
Mountain DuckPaid license per user and major version (free trial)
Mountain Duck Limitations
- Paid license, renewed with each major version
- No Linux version
- No side-by-side transfer view or space analysis
Ultra ExplorerRecommended
Ultra Explorer Strengths
- Find a file without knowing where it is: one search across all your storages in parallel (Google Drive, OneDrive, NAS, local disks…)
- Durable transfer queue with history, up to four operations at once
- Runs on macOS, Windows and Linux
- Desktop app plus a self-hosted web version (Docker)
Trade-offs & Considerations
- Does not mount storages as drives
When to choose Ultra Explorer
Choose Ultra Explorer if you mainly move, sort and analyze files across storages, on Linux too, or from a NAS.
Frequently Asked Questions: Ultra Explorer vs Mountain Duck
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Install Ultra Explorer and add your storages: sign in to your clouds or enter your server details. If you already use rclone, import your rclone.conf in Settings. Your files stay where they are; Ultra Explorer works directly with your existing accounts.
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Yes. Search (Pro) scans every storage you pick in parallel, for example Google Drive, OneDrive, your NAS and your computer, and lists every match in one place. Filter by name, extension, modification date or size, then open or move the file straight from the results.
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Free covers the dual-pane explorer, every storage, transfers and folder totals. Pro (monthly, yearly or lifetime) adds multi-storage search, space analysis and scheduled synchronizations.
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Yes. The Docker image runs the web version on your server or NAS. You sign in from a browser, and the web app can be installed on a phone.
Try Ultra Explorer for free
Download Ultra Explorer for macOS, Windows, Linux, or deploy on your NAS via Docker.