# jonasstrehle/supercookie

⚠️ Browser fingerprinting via favicon!

Repository: https://github.com/jonasstrehle/supercookie
Canonical: https://ross.abutalabs.com/products/supercookie
Homepage: https://supercookie.me
Language: HTML
License: MIT
License Family: permissive
Topics: fingerprint, favicon, javascript, html, security, tracking, identification, express, typescript, nodejs, browser, browser-fingerprinting, browser-fingerprint, supercookie, cookie, safari, chrome, edge, firefox, privacy
Archived: true
Last push: 2025-11-18T09:17:49+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 52, release rhythm 8, longevity 100
- inputs: {"age_days": 2046, "days_push": 288, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7387, forks 368 (observed 2026-08-28T04:09:59.592830+00:00)

## What it is
A demonstration web application that assigns persistent unique identifiers to website visitors via favicon-based browser fingerprinting. It is intended for educational and demonstration purposes to raise awareness of this tracking technique.

## Use cases
- demonstrate favicon-based browser fingerprinting
- test whether a browser or privacy tool blocks favicon tracking
- research persistent tracking methods that survive cache clearing and incognito mode
- educate users about browser fingerprinting risks
- self-host a fingerprinting demo server
- evaluate the effectiveness of VPNs and adblockers against favicon tracking

## When to choose
- you need a working demo of favicon fingerprinting for research or education
- you want to test privacy tools against favicon-based tracking
- you are writing about or teaching browser fingerprinting techniques

## When to avoid
- you want a production tracking system for real users - this is for demonstration only
- you need a privacy-respecting analytics solution
- you need general browser fingerprinting protection rather than a demo of the attack

## Facets
- artifact type: application
- maturity: active
- function: security, privacy, http-server, web-framework
- domain: security, privacy, web-development, browser-extensions
- platform: browser, self-hosted
- tags: browser-fingerprinting, favicon-tracking, supercookie, tracking-demo, educational, express, typescript, nodejs, web-server, docker

## Member repositories
- jonasstrehle/supercookie (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:59.592830+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:38:05.917797+00:00, confidence not recorded.
  - readme: https://github.com/jonasstrehle/supercookie (fetched 2026-08-28T04:09:59.592830+00:00, sha c0f651d2ba54)
- Data as of 2026-08-30T08:39:29.467469+00:00.