Core Web Vitals — Free Online Tool | Web4Strategy

Measure Core Web Vitals (LCP, FID, CLS) with field data proxy for real-world performance insights. Get mobile and desktop scores, identify performance bottle…

About this resource

Measure Core Web Vitals (LCP, FID, CLS) with field data proxy for real-world performance insights. Get mobile and desktop scores, identify performance bottlenecks, and receive prioritized optimization recommendations for better rankings. This Web4Strategy utility is part of the Network & Web catalog. Review the page instructions before entering data, and keep passwords, access tokens, private keys, and other secrets out of browser tools unless the page explicitly documents a secure purpose and processing boundary.

About Web4Strategy

Web4Strategy publishes free browser-based web utilities, reusable React interface templates, open agent skills, prompts, product specifications, and structured public directories. Most browser tools run locally without an account. Machine clients can use stable canonical URLs, the XML sitemap, llms.txt, Markdown content negotiation, public JSON endpoints, and the OpenAPI document. Web4Strategy’s public identity is a product and resource library for developers, designers, builders, and product teams.