# abrahamjuliot/creepjs

Creepy device and browser fingerprinting

Repository: https://github.com/abrahamjuliot/creepjs
Canonical: https://ross.abutalabs.com/products/creepjs
Language: TypeScript
License: MIT
License Family: permissive
Topics: device, fingerprinting, browser-fingerprinting, device-fingerprint, security, privacy-protection
Last push: 2026-06-11T02:46:58+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 87, release rhythm 35, longevity 100
- inputs: {"age_days": 2293, "days_push": 83, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2486, forks 287 (observed 2026-08-28T04:06:55.575924+00:00)

## What it is
CreepJS is a web application that performs advanced device and browser fingerprinting to expose weaknesses in anti-fingerprinting browsers and privacy extensions. It detects JavaScript tampering, lie patterns, and high-entropy APIs to test how resistant a browser setup is to tracking.

## Use cases
- test how well my browser resists fingerprinting
- check if my anti-fingerprinting extension leaks data
- compare privacy protection of Brave vs Tor Browser
- detect spoofed user agent and canvas lies
- audit browser privacy settings for entropy leaks
- research browser fingerprinting techniques

## When to choose
- you want to evaluate the fingerprinting resistance of a browser or privacy extension
- you are researching anti-fingerprinting weaknesses and lie detection
- you need a self-hosted fingerprint test page

## When to avoid
- you need a production fingerprinting library for user tracking - the project explicitly is not one
- you need a programmatic API or SDK rather than a web test page
- you require a commercially licensed tool - the CreepJS name is trademarked and public mirrors are prohibited

## Facets
- artifact type: application
- maturity: active
- function: security, privacy, browser-extension, developer-tools
- domain: security, privacy, web-development, browser-extensions
- platform: browser, self-hosted
- tags: browser-fingerprinting, anti-fingerprinting-testing, privacy-testing, device-fingerprint, fingerprint-detection, web-server

## Member repositories
- abrahamjuliot/creepjs (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:55.575924+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 2026-08-30T02:28:02.088076+00:00, confidence not recorded.
  - readme: https://github.com/abrahamjuliot/creepjs (fetched 2026-08-28T04:06:55.575924+00:00, sha 7e5941fef566)
- Data as of 2026-08-30T08:39:29.467469+00:00.