Revolutionary macOS File Provider
macOS provides revolutionary technology that enables kernel-level on-demand file sync. S3 Pro is the first app to implement a File Provider that lets you access and browse cloud storage without taking up disk space. When you open or access files APFS triggers S3 Pro to download only the content you want, on demand.
Advanced S3 integration
S3 is the original, and still the the fastest growing cloud-storage back end and all. S3 Pro is the only client that provides deep integration into advanced S3 features such as permissions management, versioning, CORs setting, bucket policy and more.
S3 Pro lets you select which buckets you want accessible in your apps. Choose just what you need and ignore the rest.
Deeply integrated search
S3 Pro fully integrates with Spotlight search for content you've previously browsed along with a comprehensive full-library server side search inside the dropdown. Easily get right to what you need to with high speed server-side search.
Sync without using free space
One of the most unique aspects of S3 Pro is that the files you don't needlessly use up any free space on your Mac. Files get downloaded transparently when another app requests them or when you request them in Finder.
APFS, the Apple Filesystem, manages your content and will evict your locally downloaded content if spaces gets low on your device. And soon S3 Pro will let you manually pin files to prevent evicition.
Ridiculously fast Parallel Transfer
S3 Pro utilizes the same high-speed transfer engine developed over the past decade for ExpanDrive. With the File Provider interface S3 Pro can upload and download large numbers of files in parallel, achieving dramatically higher performance than any other solution on the market.
Deep Integration with Finder and macOS
S3 Pro shows up in the Finder Sidebar along with every open and save dialog, in any app. It works with posix apps from the terminal. The on-disk content resides in ~/Library/CloudStorage. S3 Pro fully integrates with Spotlight search for content you've previously browsed.
Usage is subject to our License agreement.