# wa0x6e/cal-heatmap

Cal-Heatmap is a javascript charting library to create a time-series calendar heatmap

Repository: https://github.com/wa0x6e/cal-heatmap
Canonical: https://ross.abutalabs.com/products/cal-heatmap
Homepage: http://cal-heatmap.com
Language: TypeScript
License: MIT
License Family: permissive
Topics: javascript, series-data, calendar-heatmap, d3js, chart, calendar
Last push: 2026-08-26T20:59:08+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 4944, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3134, forks 305 (observed 2026-08-28T04:07:45.596488+00:00)

## What it is
Cal-Heatmap is a JavaScript/TypeScript charting library built on D3.js for creating time-series calendar heatmaps, similar to GitHub's contribution calendar. It offers animated date navigation, customizable time intervals and layouts, locale/timezone support, and a plugin system.

## Use cases
- create a GitHub-style contribution calendar for my app
- visualize daily activity data as a heatmap
- chart time-series data on a calendar grid
- add a yearly activity heatmap to a dashboard
- display commit or event frequency per day
- build a custom calendar heatmap with month/day layouts

## When to choose
- you need a calendar heatmap visualization in a web app
- you want fine control over layout, scales, and date navigation
- you need locale, timezone, or RTL support in the chart

## When to avoid
- you need general-purpose charts like line or bar charts
- you need non-calendar-based time-series visualizations
- your project does not use D3-compatible DOM rendering

## Facets
- artifact type: library
- maturity: active
- function: data-visualization, charts
- domain: data-visualization, frontend, web-development
- platform: browser, cross-platform
- tags: calendar-heatmap, d3js, time-series, typescript, github-contribution-graph, nodejs

## Member repositories
- wa0x6e/cal-heatmap (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:45.596488+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 2026-08-30T07:26:06.939564+00:00, confidence not recorded.
  - readme: https://github.com/wa0x6e/cal-heatmap (fetched 2026-08-28T04:07:45.596488+00:00, sha 52e083b26180)
  - registry_npm: https://registry.npmjs.org/cal-heatmap (fetched 2026-08-29T09:41:10.449397+00:00, sha b9250f242c7c)
- Data as of 2026-08-30T08:39:29.467469+00:00.