Technical research on ISP surveillance, privacy detection techniques, and network-level tracking.
A VPN shifts who sees your traffic: your ISP out, VPN provider in. Whether that's an improvement depends on which one you trust less. A practical breakdown of what changes, what doesn't, and how to verify your VPN is doing anything at all.
HTTP vs HTTPS, DNS queries, SNI, traffic metadata, deep packet inspection. A precise breakdown of what is and isn't visible to your internet provider at every layer of the stack.
Verizon injected a unique tracking identifier into every HTTP request for years. Your ISP may still be doing something similar. Here's the technique we use to detect it, running entirely from your browser with no install required.
Curious about the technical methodology behind our privacy checks? We explain every signal we detect, how we score it, and the limitations of browser-based detection.
Read the methodology →