CostWatch vs Azure budget alerts
Azure Cost Management includes budgets and alerts, and you should use them. But a budget alert tells you when total spend crosses a line you guessed in advance. Anomaly detection answers a different question: did something jump today that never jumps?
What triggers it
CostWatch: A statistical jump against each service's own rolling baseline, even if the monthly total is still under budget.
Azure budget alerts: Total or forecasted spend crossing a fixed threshold you set.
Attribution
CostWatch: Names the service and resource group that jumped, and by how much.
Azure budget alerts: Tells you the budget tripped; finding the cause is on you.
Timing
CostWatch: Flags the spike the day after it appears in your cost data.
Azure budget alerts: Often fires late in the month, after the spike has been running for weeks.
Setup
CostWatch: Upload the daily cost CSV you already export. No connector, no permissions.
Azure budget alerts: Configured per subscription in the portal, needs sensible thresholds per scope to be useful.
Cost
CostWatch: Pro at $49/mo for your own subscriptions, MSP at $199/mo for client tenants. Both start with a 7-day trial.
Azure budget alerts: Included with Azure.
The short version: if the alternative is working for you, keep it. If it is quietly costing you hours or risk, CostWatch takes minutes to evaluate and the trial runs for a week.