Show HN: Relia – Open-Source "ESLint" for AWS Costs (Python, Local-First) (opens in new tab)

I’ve spent 7 years in cloud engineering, and I’m tired of "reactive" FinOps tools (CloudHealth/Vantage) that only tell you about waste 30 days after the invoice hits.

I built Relia to be the "ESLint" for cloud costs. It parses Terraform plans locally and blocks PRs that exceed a budget.

Repo: https://github.com/davidahmann/relia_oss

How it works:

Parses .tf files or JSON plans (Cost estimation logic is in Python).

Maps resources to a bundled SQLite pricing database (works fully offline/air-gapped).

Fails the build if monthly_cost > budget (defined in .relia.yaml).

Why not Infracost? Infracost is great, but I wanted something purely offline and privacy-first. Relia doesn't require an API token, doesn't ping a SaaS, and has no "Enterprise" tier. It’s just a CLI tool you own.

It currently supports AWS (EC2, RDS, Lambda, NAT Gateways). I’d love feedback on the heuristic matching logic.