See exactly what your browser reveals to the internet. Instantly check your screen resolution, OS architecture, GPU renderer, and Public IP address.
Easily gather all the technical metrics required by software engineers to debug responsive layout issues.
The DOM executes the `navigator.hardwareConcurrency` API to accurately estimate how many logical CPU cores your machine has available to process complex JavaScript threads.
Instead of displaying a confusing, unreadable `Mozilla/5.0...` string, our parser cleanly extracts your exact Browser Name, Browser Version, and Operating System.
The application pings a secure third-party server to echo back the exact IPv4 or IPv6 address your internet service provider is broadcasting to the world.
When you visit a website, your web browser automatically transmits hundreds of data points about your physical computer to the server. While frontend developers use this data innocently to ensure the website layout looks correct on your specific screen, marketing firms use this exact same data for a practice known as Browser Fingerprinting.
Since the invention of the internet in the 1990s, every HTTP request has included a User-Agent header. This is a text string that identifies the software making the request. A modern User-Agent string looks like a complete mess of historical artifacts:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36
Advertising companies do not need cookies to track you across the internet.
When millions of people visit a website, their computers are technically identical. However, when you combine 15 different innocuous data points together—your exact screen resolution (1920x1080), your timezone (UTC-5), your operating system (macOS), your CPU core count (8), the specific fonts installed on your machine, and your GPU renderer (Apple M1)—you create a unique "Fingerprint".
Even if you delete your cookies or use a VPN to hide your IP address, advertisers can look at your hardware fingerprint and say with 99% certainty: "This is the exact same person who was looking at shoes on another website yesterday." Modern browsers like Safari and Firefox have begun aggressively restricting what data the navigator API can access to combat this surveillance.
If a button is broken on a website, telling a developer "it doesn't work on my computer" is completely useless. The developer needs to perfectly recreate your physical environment to see the bug.
If you check your resolution on a modern iPhone, the tool will say your screen is "390x844". However, Apple claims the screen is "1170x2532". Why the difference? Modern phones use high-density (Retina) displays. They cram 3 physical LED pixels into the space of 1 logical software pixel to make text look incredibly sharp. The browser reports the logical size (390px) to prevent websites from rendering microscopically small on your phone.