We wrote Confidant in the beginning of 2015, so it's not a reinvention of sneaker. That said, sneaker is very similar in design, as is credstash: https://github.com/fugue/credstash

Both of those are really great projects and I recommend them if they fit your use-case.

One of the reasons we originally avoided S3 was because it can occasionally be very eventually consistent, which we wanted to avoid. We also wanted to avoid fanning out secrets to services when the secret needed to be shared between multiple services.

We also wanted to have a UI that was simple and easy to use for everyone.