PerfectTOML is yet another TOML parser. It is fully compliant with TOML v1.0.0, and faster than existing TOML parsers for Ruby. PerfectTomlImproved is just a fork of PerfectToml with a features I have merge requests open for in PerfectToml. PerfectTomlImproved will go away once the changes are merged. You should use PerfectToml unless you want those features.