Calendar Heatmap
GitHub-style contribution calendar heatmap for visualizing daily data.
Calendar Heatmap
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Total Days
365
Active Days
22
Max Value
9
Data Input
Transparent
Usage Instructions
Features
Generate a GitHub-style contribution calendar heatmap to visualize daily data intensity across the year by date and value, with four color schemes (green, blue, purple, orange) and statistics for total days, active days, and maximum value.
Steps
Enter data line by line in "date,value" format in the text box → Set the year and color scheme → Preview the chart live, downloadable as PNG/JPG/WebP images.
Notes
The chart is rendered locally in your browser and no data is uploaded; date format is YYYY-MM-DD; colors gradient based on the ratio of value to maximum; export supports multiple scales for higher clarity.