3Hub 4+

If you're on the hunt for a good S3 solution on the Mac, I certainly would recommend 3Hub. Always works, and provides the features/functions you need to get the job done. For the price you have near zero risk with this app. Only thing I'd throw on the wish list is tighter integration with Finder. Though you have to be careful what you wish for. I actually tried another client solution (Name begins with "J") but abandoned it because local folder name changes in Finder's nav bar were automatically mirrored in S3, which I didn't care for. I've also found that my particular S3 need is sporadic. I like that I can run 3Hub as needed, vs. having it as an "always on" app taking up resources on my MacBook AIr.

3Hub provides me with 95% of what I need, and for the price, I'm a very happy customer.

The app’s UI is clean and fairly snappy, if rudimentary and clumsy at times (e.g., renaming folders). It’s straightforward to set up and use.

My big problem with this app is that the transfer speed appears to be hamstrung. On two different machines, over a total of five different networks, 3Hub gives me an upload speed of around 50 KB/s (yes, bandwidth limitation is off), while the s3cmd command line tool gives me transfer speeds closer to 90% of my available bandwidth - at work, that’s over 15 MB/s, which is literally 300 times faster. As a data scientist, I’m moving hundreds of gigs of data every day, and as they say, ain’t nobody got time for that.

I’m willing to believe that there’s something wrong with my configuration or something, but if there is I can’t find it. I’d add a star or two if the bandwidth issue were fixed.

The app is simple, fast and good at all, but it has a buggy folder support. AWS S3 doens't support folders, but the clients can (and should) treat key files like "mystuff/" as a folder, but this isn't the case here. The 3Hub uses a very weird and non-elegant prefix system like $folder$ that is only supported by itself! It means that if you share the bucket with another clients it won't work and will possibly mess everything up!
It is a shame, this is a quite neat app...