Web Vitals Budget Simulator
Estimate LCP, INP, CLS and Total Blocking Time from a deterministic browser-side resource budget.
About this tool
Model render-blocking resources, script execution, input delay, transfer time, and layout shifts against Core Web Vitals budgets. Web Vitals Budget Simulator runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- Web Vitals Budget Simulator is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use Web Vitals Budget Simulator?
Open Web Vitals Budget Simulator, enter or paste your input, and copy the result. The page works without an account.
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