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
Stop the "SaaS Tax"
Your team could be burning cash. Switching to cal-heatmap instantly boosts your runway.
Competitor Cost
-$1,440
/ year (est. based on Google Charts)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%