# epochjs/epoch

A general purpose, real-time visualization library.

Repository: https://github.com/epochjs/epoch
Canonical: https://ross.abutalabs.com/products/epoch
Homepage: http://epochjs.github.io/epoch
Language: HTML
License: MIT
License Family: permissive
Last push: 2019-02-14T08:38:22+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4815, "days_push": 2757, "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 4949, forks 274 (observed 2026-08-28T04:09:03.688194+00:00)

## What it is
Epoch is a general-purpose charting library built on d3 and Canvas, offering basic charts for historical reports and real-time charts for frequently updating timeseries data. It provides a unified CSS styling engine for both SVG and Canvas plots.

## Use cases
- render real-time timeseries dashboards
- create historical charts like line, bar, pie, and area
- build smooth high-performance canvas visualizations
- style SVG and canvas charts from a single stylesheet
- display live streaming metrics in a web app

## When to avoid
- you need actively maintained software with recent releases
- you need modern framework integrations like React or Vue components
- you require chart types beyond the basic set offered

## Facets
- artifact type: library
- maturity: abandoned
- function: data-visualization, charts
- domain: data-visualization, web-development, frontend
- platform: browser
- tags: d3, real-time-charts, canvas, svg, timeseries, nodejs

## Member repositories
- epochjs/epoch (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:03.688194+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 2026-08-29T18:17:52.319048+00:00, confidence not recorded.
  - readme: https://github.com/epochjs/epoch (fetched 2026-08-28T04:09:03.688194+00:00, sha a4280b73b433)
  - homepage: http://epochjs.github.io/epoch (fetched 2026-08-29T08:59:19.972695+00:00, sha 438b46870e5c)
- Data as of 2026-08-30T08:39:29.467469+00:00.