Yes, SOPS does have `exec-env` which does the same thing, kind of. From one of the issues, it currently lacks support for the POSIX-semantic way to run commands: https://github.com/getsops/sops/issues/1469, where you cannot add a `--` to tell sops that everything after it is supposed to be a command, so you end up having to quote everything. Other things that I found lacking were that with SOPS, adding a new team member means manually updating .sops.yaml, re-encrypting all files, and managing PGP/age keys. With kiln, you just add their SSH key to kiln.toml and run `kiln rekey`.

kiln also lets you have different access controls per environment file (devs get staging, only ops get production) without separate .sops.yaml configs, automatically discovers keys from SSH agent/~/.kiln/, and has built-in template rendering and export formats for different tools. You could definitely build similar workflows with SOPS + scripts, or any other tool, but kiln packages these common patterns into a single tool with better UX for teams.

Think of kiln as "opinionated SOPS", focused specifically on environment variables rather than general file encryption.