# macbre/phantomas

Headless Chromium-based web performance metrics collector and monitoring tool

Repository: https://github.com/macbre/phantomas
Canonical: https://ross.abutalabs.com/products/phantomas
Homepage: https://www.npmjs.com/package/phantomas
Language: JavaScript
License: BSD-2-Clause
License Family: permissive
Topics: phantomas, metrics, javascript, css, webperf, dom, domquery, jquery, webperformance, developer-tools, automation, puppeteer, chromium, headless-chrome, http3, http2
Last push: 2026-08-24T15:53:38+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 74, longevity 100
- inputs: {"age_days": 5170, "days_push": 9, "days_rel": 97, "gap_med": 42, "n_releases_24m": 12}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2260, forks 135 (observed 2026-08-28T04:06:31.691825+00:00)

## What it is
A headless Chromium-based web performance metrics collector and monitoring tool built on Node.js and Puppeteer. It loads pages in a headless browser and reports detailed performance metrics and offenders via a CLI, Node API, or Docker image.

## Use cases
- measure page load performance metrics for a url
- monitor website performance regressions in ci
- audit dom queries and javascript execution on a page
- collect http response and request metrics with headless chrome
- run web performance audits from docker
- track web vitals style metrics over time

## When to choose
- you need detailed, modular web performance metrics from a real headless browser
- you want a scriptable Node.js API or CLI for automated perf audits
- you prefer a dockerized tool for CI performance monitoring

## When to avoid
- you need lighthouse-style scores and best-practice audits rather than raw metrics
- you need real-browser testing with visible UI or screenshots of interactions
- your project does not use Node.js and you cannot run Docker

## Facets
- artifact type: cli-tool
- maturity: active
- function: monitoring, benchmarking, developer-tools
- domain: web-development, performance, developer-tools
- platform: cli, cross-platform
- tags: web-performance, headless-chromium, puppeteer, metrics-collector, webperf, nodejs, docker

## Member repositories
- macbre/phantomas (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:31.691825+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 2026-08-30T02:42:39.112021+00:00, confidence not recorded.
  - readme: https://github.com/macbre/phantomas (fetched 2026-08-28T04:06:31.691825+00:00, sha 2b3935373cde)
  - registry_npm: https://registry.npmjs.org/phantomas (fetched 2026-08-29T10:23:34.894158+00:00, sha a060e2aa3c97)
- Data as of 2026-08-30T08:39:29.467469+00:00.