Tool Open source

Who Are You

Who Are You is an open-source privacy self-check that runs on Cloudflare Workers and shows what a website can infer from a visit. It runs browser and network sniffers without permission prompts, combines their readings into a portrait covering location, language, time zone, device, browser, graphics hardware, network, preferences, and fingerprinting, and compares those readings to identify contradictions that may reveal a VPN or proxy. Twelve environment checks receive an A–F grade, including time-zone and language mismatches, DNS and WebRTC leaks, split routing, proxy-like round-trip differences, data-center networks, user-agent inconsistencies, tampering, fingerprint stability, and automation. The site provides per-check explanations and system-specific DNS or WebRTC fixes, supports comparisons with previous runs and sharing of masked results, and keeps most readings in the browser; its Cloudflare Worker handles the request data and anonymous aggregate counters without retaining visit logs. It can be self-hosted with Wrangler and is released under the MIT license.

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What Who Are You is used for

1 use taken from transcripts — each links to the moment in the video.

  • A privacy self-check running on Cloudflare Workers that shows what a website can figure out about you from your visit, grading 12 checks from A to F with tips to fix leaks like a time zone that doesn't match your IP.

Videos mentioning Who Are You

1 in the library.