Spec-driven development went mainstream, and there are good tools for it. Most make one developer's AI output better. REEZN is built for a different job: governed spec-driven development for teams, where product and engineering approve together and your standards, safeguards, and sign-offs are enforced by the platform, not left to discipline. Here is how it stacks up against the tools teams weigh it against, honestly, conceding what each one does well.