How is Gridsync related to S4? Anamika October 20, 2017 10:48 Updated Gridsync is a new cross-platform desktop application, which provides a graphical user interface (GUI) to S4. Related articles How do I get my “invite code”? How should I configure Tahoe-LAFS and find more information about it? What does Gridsync provide to S4 customers? What is Gridsync? Comments 0 comments Please sign in to leave a comment.