Yes it's official, v3.0 is now available to download for Windows, macOS and Linux.
Mac App Store:
https://itunes.apple.com/app/sftp-client/id1201717048
Linux Snap Store:
https://snapcraft.io/sftpclient
Windows App Store:
Coming shortly (Application Pending)
Directly from sFTP Client:
https://www.sftpclient.io/download
(If you'd prefer not to use an app store to download our app, you can download our packaged version directly from our website above, all packages are code signed under our publisher name "sFTP Client Ltd")
Please let us know your thoughts and share any ideas or features you'd like to see in our app.
We will also soon be opening our community forums!