Mountain Duck

Name: Mountain Duck
Rating: 0 (0 reviews)
Author: David Kocher

Mount remote storage as a disk

Only for Mac

Free · In‑App Purchases

Ages

4+
Years
Category

Productivity
Developer

David Kocher
Language

EN
+ 36 More
Size

311.5
MB

Mac

Mountain Duck lets you mount server and cloud storage as a disk on your desktop. With Smart Synchronization, files are synchronized to the local disk when opened to allow offline usage and changes are uploaded in the background as soon as a connection is available. Open remote files with any application and work like on a local volume. Transfer files using Finder to remote servers, fast. Select files and folders to always keep offline on your computer. Other files are downloaded and cached on demand only and otherwise do not take space on your local disk. Encryption for data at rest using Cryptomator interoperable vaults prevent unauthorized access regardless of the server or cloud storage infrastructure. Based on the solid open source foundation of Cyberduck, all major protocols are supported to connect to just about any server you want. Including FTP, SFTP, WebDAV, Azure Cloud Storage, Amazon S3, Google Cloud Storage, Google Drive, Dropbox, Backblaze B2 & OpenStack Swift. Standard Apple Terms of Use (EULA) from https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ apply.

Ratings & Reviews

This app hasn’t received enough ratings or reviews to display an overview.

Really God But Support ?
05/29/2019

Federmanhoyos
I bought the application because its option of offline mode. And so far the application has been working pretty well. The complaint is that I cant open PDF files ( Preview or any other editor ) and write notes in the pdf. Every time I do that I receive a messages telling me that is not allowed and basically force me to save the document with a different name. I have emailed to the product support, but guess what? No answer at all. Nothing. Fixing the PDF editing error and fixing his support service I will 5 starts to the product

Developer Response
Files opened in Preview.app and edited cannot be saved at the original location but the message "The original document can't be changed, so a duplicate with your changes has been created" is displayed in the title bar. As a workaround you can set a custom mount point in Preferences → Connection → Mount Location for volumes such as a ~/Volumes/ folder in your home directory. Also refre to our FAQ or known issues at https://trac.cyberduck.io/wiki/help/en/howto/mount/issues#OriginaldocumentcantbechangedPreview.app
Really God But Support ?
05/29/2019

Federmanhoyos

I bought the application because its option of offline mode. And so far the application has been working pretty well. The complaint is that I cant open PDF files ( Preview or any other editor ) and write notes in the pdf. Every time I do that I receive a messages telling me that is not allowed and basically force me to save the document with a different name. I have emailed to the product support, but guess what? No answer at all. Nothing. Fixing the PDF editing error and fixing his support service I will 5 starts to the product
Developer Response 06/04/2019
Files opened in Preview.app and edited cannot be saved at the original location but the message "The original document can't be changed, so a duplicate with your changes has been created" is displayed in the title bar. As a workaround you can set a custom mount point in Preferences → Connection → Mount Location for volumes such as a ~/Volumes/ folder in your home directory. Also refre to our FAQ or known issues at https://trac.cyberduck.io/wiki/help/en/howto/mount/issues#OriginaldocumentcantbechangedPreview.app
One of the best
12/29/2020

MichaelThwaite
Extends my desktop to servers, sharepoint, S3 and more, reliably. But don't expect the attached disk to work exactly like your internal disk - it's a long way away! When you take that into consideration then this is one of the best tools out there.Making an S3 bucket or a SharePoint or Google drive look like a local disk is no easy task. Things you do on a local disk like renaming files, moving a hundred files to a new folder, etc. become far more difficult when the wire between you and the disk is 2,000 miles long!Take S3 for example, you can't rename or edit files in an S3 bucket yet Mountain Duck makes it seem as though you can - silently re-copying and renaming S3 objects in the background - more like a swan than a duck.
One of the best
12/29/2020

MichaelThwaite

Extends my desktop to servers, sharepoint, S3 and more, reliably. But don't expect the attached disk to work exactly like your internal disk - it's a long way away! When you take that into consideration then this is one of the best tools out there.Making an S3 bucket or a SharePoint or Google drive look like a local disk is no easy task. Things you do on a local disk like renaming files, moving a hundred files to a new folder, etc. become far more difficult when the wire between you and the disk is 2,000 miles long!Take S3 for example, you can't rename or edit files in an S3 bucket yet Mountain Duck makes it seem as though you can - silently re-copying and renaming S3 objects in the background - more like a swan than a duck.
Fantastic - S3 As a Filesystem More
07/14/2022

Shango80
I love this application. I was previously on the G Suite plan with unlimited storage, but when that was phased out I needed a solution to let me have multi-system sync and offline access to large collections of data. Mountain Duck lets me do this; and with a combination of being able to use native AWS S3 and local S3 I can mix and match my storage tiers and pricing!One request here -- would be great if we could enter our own preferences on the sizes of the local cache. The existing choices jump from 10 GB (not enough for some workflows) to 500 GB (more local disk than I have). Can we just enter a number in GB?
Fantastic - S3 As a Filesystem More
07/14/2022

Shango80

I love this application. I was previously on the G Suite plan with unlimited storage, but when that was phased out I needed a solution to let me have multi-system sync and offline access to large collections of data. Mountain Duck lets me do this; and with a combination of being able to use native AWS S3 and local S3 I can mix and match my storage tiers and pricing!One request here -- would be great if we could enter our own preferences on the sizes of the local cache. The existing choices jump from 10 GB (not enough for some workflows) to 500 GB (more local disk than I have). Can we just enter a number in GB?
WARNING - New Version Invalidates License
12/01/2025

JohnnyG925
I would give this product 5 starts as it has worked wonderfully for me for years now. But id don’t work for me at all anymore…let me explain.When I initially purchased the software, the model was a one-time payment that included all future updates free of charge via the App Store. However, the latest update transitioned the product to a subscription model. While I generally have no issue with a subscription model change, I have a major concern with how this update was deployed. It was pushed through the App Store as an automatic update to the previous, paid version. This automatic update has forced my previously working version onto the new subscription-required platform.As a direct result of this update, the license I previously purchased has been invalidated, and I can no longer use the program.I contacted support regarding this situation, and the response indicated that there is no way to revert to the previous version (Version 4) and that I must pay what feels like an extortionate fee to continue using software I already own outright.

Developer Response
You are eligible to run version 5 with no limitations for up to one year after your purchase date before you are required to purchase a monthly or yearly subscription. We never advertised a "lifetime" license, but have been unable to charge for major updates in the Mac App Store in contrast to licenses purchased from our website. We published regular free upgrades for the last 10 (!) years in the Mac App Store, but you will understand this is not sustainable for our business when maintaining and adding new features to the software.You are welcome to request a free license from our support to run Mountain Duck 4 available from our website if you don't want to upgrade at this time.
WARNING - New Version Invalidates License
12/01/2025

JohnnyG925

I would give this product 5 starts as it has worked wonderfully for me for years now. But id don’t work for me at all anymore…let me explain.When I initially purchased the software, the model was a one-time payment that included all future updates free of charge via the App Store. However, the latest update transitioned the product to a subscription model. While I generally have no issue with a subscription model change, I have a major concern with how this update was deployed. It was pushed through the App Store as an automatic update to the previous, paid version. This automatic update has forced my previously working version onto the new subscription-required platform.As a direct result of this update, the license I previously purchased has been invalidated, and I can no longer use the program.I contacted support regarding this situation, and the response indicated that there is no way to revert to the previous version (Version 4) and that I must pay what feels like an extortionate fee to continue using software I already own outright.
Developer Response 12/04/2025
You are eligible to run version 5 with no limitations for up to one year after your purchase date before you are required to purchase a monthly or yearly subscription. We never advertised a "lifetime" license, but have been unable to charge for major updates in the Mac App Store in contrast to licenses purchased from our website. We published regular free upgrades for the last 10 (!) years in the Mac App Store, but you will understand this is not sustainable for our business when maintaining and adding new features to the software.You are welcome to request a free license from our support to run Mountain Duck 4 available from our website if you don't want to upgrade at this time.

• Performance improvements in “Smart Synchronization” connect mode • Validate tokens when using AWS S3 CLI connection profile (#17690)

Version 5.1.1

12/24/2025

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Supported Features
- VoiceOver
- Voice Control
- Dark Interface
- Differentiate Without Color Alone
- Sufficient Contrast
- Reduced Motion

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Category
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In-App Purchases
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Developer Website

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Family Sharing

Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

Mountain Duck

Mount remote storage as a disk

Ratings & Reviews

What’s New

Version 5.1.1

App Privacy

Data Not Collected

Accessibility

Supported Features

VoiceOver

Voice Control

Dark Interface

Differentiate Without Color Alone

Sufficient Contrast

Reduced Motion

Information

Supports

Family Sharing