kodebeat / papers / cost
Knowing what changed your cloud bill, and why
A ranked diff of two Cost Explorer periods.
Cost Explorer will show you this month and last month grouped by service, and will not tell you what changed, ranked, which is the only form of the answer anyone wants. cost-diff subtracts two periods, ranks by money moved rather than percentage, flags services that appeared from nothing, and renders a report you can read in fifteen seconds. Its numbers reconcile with the invoice because they are the provider's own.
What is in it
- The problem — what goes unanswered without it, and who notices first.
- Why the obvious alternative falls short — stated plainly, including where it is the better choice.
- How it works — the method, not a feature list.
- Concrete use cases — with console output quoted from the repository, never reconstructed.
- The methodology behind any number it emits — every term shown, so the figure survives a question.
- What it deliberately does not do — the section most papers leave out.
Part of the Cost & FinOps theme.
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