cal-heatmap

The premium Open Source alternative to Google Charts

🎯 Best for:Visualizing activity or time-series density on web-based dashboards.

What is cal-heatmap?

A JavaScript alternative to custom D3.js heatmap implementations for visualizing activity density. Provides a modular API to create interactive, responsive calendar grids for data analysis.

Tech Stack
TypeScriptData Visualization

Why cal-heatmap?

  • D3.js integration
  • Responsive design
  • Modular architecture

Limitations

  • D3 dependency
  • Limited to heatmaps
  • Learning curve for D3
3/5/2026
Last Update
304
Forks
54
Issues
MIT
License
Financial Leak Detected

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Competitor Cost
-$1,440
/ year (est. based on Google Charts)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%

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