See the cost spike before the invoice

The problem

Your spend changes daily. Your invoice does not

Most teams check cloud and AI spend once a month. By then, a spike is old news and the waste has already repeated.

• surprise billsA runaway job or an agent loop can run for days before anyone sees it. The invoice arrives weeks later, when it is too late to stop it.
• nobody watches dailyAWS, your AI provider, and your SaaS tools each have their own console. No single page shows all of them, so nobody looks until month end.
• waste nobody findsIdle resources and unused commitments keep billing. Nobody checks for them, so the same waste repeats every month.
• unowned spendCosts have no team or project attached, so nobody owns them. A line item can triple overnight and no one notices.

The alert

The message you get when a line jumps

The card at the top shows a $302 day on one Claude model. That is 64% above its 14-day average, so the default rule fires. CostMon posts this message in your in-app feed. It also sends it by email, Slack, or webhook once you add a channel.

Anomaly: anthropic / claude-opus-4-6 spend spike

anthropic / claude-opus-4-6 was $302.00 on 2026-10-23 — 64% above its 14-day average of $184.00.

Severity: warning
Occurred on: 2026-10-23

{
  "id": "01978e4a-6f3d-7c92-8b41-2e9a7d4c1f60",
  "kind": "anomaly",
  "ref_id": "01978e4a-1a2b-7c3d-9e4f-5a6b7c8d9e0f",
  "title": "Anomaly: anthropic / claude-opus-4-6 spend spike",
  "detail": "anthropic / claude-opus-4-6 was $302.00 on 2026-10-23 — 64% above its 14-day average of $184.00.",
  "severity": "warning",
  "status": "open",
  "owner_user_id": null,
  "observed_value": 302,
  "threshold_value": 196.26493258964643,
  "occurred_on": "2026-10-23"
}

Every new account starts with this rule. Add a channel, and the next spike reaches you. You can tune the rule, or add rules for a budget, one service, or token use.

Try the detection math →Connect a source →

Estimate your waste

See what your stack is quietly wasting

Drag your real numbers in. Everything below computes in your browser. Nothing you type here is sent anywhere.

This is only an estimate. It draws on Flexera's 2025 State of the Cloud report. The report found that organizations waste 27% of cloud spend. It also found that 84% of orgs struggle to manage cloud spend. CostMon shows you where your spend goes. It does not guarantee savings. We never take a cut of what you save. This estimate leaves out one of the biggest levers. Check the commitment discount calculator to see how much a Savings Plan or Reserved Instance could add. If you run Kubernetes, idle capacity hides differently there. See the Kubernetes cost allocation & idle capacity calculator.

Features

See it, get alerted, cut the waste

CostMon watches your spend every day, tells you when a line jumps, and points at what you can cut.

FinOps for AI

Your AI bill, broken down like an engineer would

Anthropic, OpenAI, Amazon Bedrock, Vertex AI / Gemini, and Helicone usage lands in the same normalized view as the rest of your stack. You also get the token-level detail an AI budget needs.