I was looking at the schema language of permify - Did they copy it from SpiceDB with a little bit of syntactic sugar ? 😆

entity user {}
        
entity organization {

    // organizational roles
    relation admin @user
    relation member @user
}

entity document {

    // represents documents parent organization
    relation parent @organization
    
    // represents owner of this document
    relation owner  @user
    
    // permissions
    action edit   = parent.admin or owner
    action delete = owner
}

in terms of features, I can give a general overview, but there are a number of differences

at the high level, SpiceDB is the most "battle tested" of the set, having been fully tested and documented to work at over 1 million QPS and 100 Billion relationships (see: https://authzed.com/blog/google-scale-authorization). Other implementations are claiming this, but without (currently) published results

in terms of features, a bunch of features we've pioneered have been copied but the main differences are: OpenFGA does not support revision-based operations, which means it will not have the same level of caching or new enemy protection. Permify copied our caveats implementation but did so solely as "attributes", which makes it strictly less powerful than caveats in terms of being able to conditionally link together objects based on various attributes

there is a litnay of smaller feature differences too

day 2 operations are also a major difference, with us providing the SpiceDB Operator for running and managing the system