# sitespeedio/coach

Clear Eyes. Full Hearts. Can’t Lose.

Repository: https://github.com/sitespeedio/coach
Canonical: https://ross.abutalabs.com/products/coach
Language: JavaScript
License: MIT
License Family: permissive
Topics: coach, performance, perfmatters
Archived: true
Last push: 2024-05-16T11:54:50+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3901, "days_push": 839, "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 1196, forks 62 (observed 2026-08-28T04:03:57.284281+00:00)

## What it is
The Coach is a web performance tool that analyzes pages and gives advice on performance problems, acting as a modern successor to YSlow. Its core functionality has moved to coach-core, and it is most easily used via sitespeed.io.

## Use cases
- find performance problems on my web page
- audit page speed like YSlow
- get performance advice for a website
- check if my page follows performance best practices
- integrate web performance checks into sitespeed.io runs

## When to choose
- you want YSlow-style performance advice for web pages
- you already use sitespeed.io and want built-in coaching
- you need programmatic page performance analysis in JavaScript

## When to avoid
- you need actively developed new features (core moved to coach-core)
- you need full RUM or lab performance metrics rather than rule-based advice
- you need Lighthouse-style audits with modern Core Web Vitals scoring

## Facets
- artifact type: library
- maturity: maintenance
- function: monitoring, benchmarking, developer-tools
- domain: web-development, performance, developer-tools
- platform: cli
- tags: web-performance, yslow-successor, page-speed, advice, sitespeedio, nodejs, web-server

## Member repositories
- sitespeedio/coach (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:57.284281+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 2026-08-30T06:22:04.138563+00:00, confidence not recorded.
  - readme: https://github.com/sitespeedio/coach (fetched 2026-08-28T04:03:57.284281+00:00, sha c935374bc48b)
- Data as of 2026-08-30T08:39:29.467469+00:00.