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Cost Explorer

A page for analyzing month-to-date cost and the per-service cost breakdown.

Cost Explorer

Key Features​

KPI Tiles​

Seven tiles at the top of the page summarize your cost posture:

  • Month-to-date: Cumulative cost from the first of the month through now
  • MoM (daily average): Month-over-month change. Since the current month is partial, the comparison is made on a daily-average basis to avoid distortion from incomplete data
  • Projected month-end cost: AWS forecast or a linear estimate (the tile shows AWS forecast / linear estimate)
  • Daily Average: Mean of the trailing-30d daily totals (today's still-accumulating bucket excluded; service filters apply)
  • Last Month: The previous month's total
  • Service count: Number of services that incurred cost — with an 'N increasing >20%' subtext when services grew more than 20% over last month
  • Top service: The highest-cost service and its amount

When there is no data at all (every series empty), a 'no cost data in the selected period' banner appears with a Check availability button — if Cost Explorer is confirmed not enabled (host account), an onboarding hint appears (enable it in the Billing console; up to 24h until data shows); if it is available, the banner says the period most likely had no spend.

Trend Charts​

  • Monthly cost trend: An area chart of monthly cost over roughly the last 6 months
  • Daily cost trend: An area chart of daily cost over roughly the last 30 days

Per-Service Breakdown​

  • Cost by service: A horizontal bar list of cost per service
  • Cost composition: A donut chart of the top services plus an Other rollup of the remainder
  • Service detail table: service / this month / last month / change (day-normalized — thresholds: >20% red · >0 orange · <0 green; no baseline '—') / share (mini bar) — numeric sort, search, and a problems-only toggle

Service Drill-Down Panel​

Clicking a service row in the table opens a detail panel on the right:

  • Daily cost trend (30 days): That service's daily cost over the last 30 days
  • Usage-type breakdown: Cost broken down by usage type over the last 3 months
  • Drag the panel edge to resize its width; close it with the × button, Esc, or clicking the backdrop
Service drill-down panel

How to Use​

  1. Click Cost > Cost Explorer in the sidebar
  2. Check month-to-date cost and the month-end projection in the KPI tiles
  3. Read the trend charts to understand monthly and daily cost flow
  4. Review the distribution with the Cost by service list and the Cost composition donut
  5. In the Service detail table, click a row to view that service's daily trend and usage-type breakdown
  6. Use the refresh button to reload the latest data

Tips​

Understanding partial aggregation

Because the current month is still in progress, the MoM metric compares on a daily-average basis rather than full-month totals. This keeps the change percentage reliable even early or mid-month.

Graceful degradation

If some trend, monthly, or forecast data fails to load, the per-service breakdown still renders. If cost data does not appear, check your Cost Explorer permissions or session state.

Timestamps

Times shown in the app are in Korea Standard Time (KST, Asia/Seoul).

AI Analysis Tips​

From the floating AI Assistant button or the Assistant page, you can ask questions such as:

  • "Which service costs the most this month?"
  • "Is cost up or down compared to last month?"
  • "What's the projected month-end cost?"
  • "Break down EC2 cost by usage type"