I posted about AIDE a few weeks ago. I have not checked how that compares to this submission:

https://news.ycombinator.com/item?id=44688636

AIDE is a solid and mature tool. Kekkai focuses on being lightweight:

content-only hashing to avoid false positives,

S3 integration with strict write/read separation,

a single Go binary with minimal dependencies. It’s designed to be easy to deploy and run in production.