# Calendar Heatmap Generator Generate GitHub-style calendar heatmaps to visualize activity patterns over time, perfect for tracking yearly contributions, habits, or metrics > Canonical page: https://elysiatools.com/en/tools/calendar-heatmap - **Category:** Data Visualization - **Keywords:** calendar heatmap, GitHub style, activity tracker, yearly view, contribution graph, time series, heatmap, data visualization ## Overview The Calendar Heatmap Generator creates intuitive, GitHub-style activity visualizations that map your data points across a full year. By transforming time-series metrics into color-coded intensity grids, this tool makes it easy to identify trends, track habit consistency, and monitor long-term performance patterns at a glance. ## Inputs - **Activity Data** (textarea): Activity data for the calendar heatmap. Format: date|value|label (YYYY-MM-DD format) - **Chart Title** (text): Title that will be displayed above the heatmap - **Color Scheme** (select): Select color scheme - **Year** (number): Year for the calendar (leave empty for current year) - **Custom Start Color** (color): Start color for custom color scheme (requires Custom Colors selection) - **Custom End Color** (color): End color for custom color scheme (requires Custom Colors selection) - **Empty Day Color** (color): Color for days with no activity - **Border Color** (color): Border color for cells - **Cell Size** (number): Size of each day cell in pixels (8-20) - **Cell Spacing** (number): Spacing between cells in pixels (1-5) - **Animation Duration** (number): Animation duration in milliseconds - **Background Color** (color): Background color for the chart container - **Show Values in Cells** (checkbox): Display values inside the cells (works better with larger cells) - **Show Color Legend** (checkbox): Display the color intensity legend - **Show Month Labels** (checkbox): Display month names above the calendar - **Show Day Labels** (checkbox): Display day of week labels - **Show Statistics** (checkbox): Display activity statistics below the chart - **Show Tooltips** (checkbox): Enable hover tooltips for cells ## When to use - Visualizing daily contribution frequency or project activity over a 12-month period. - Tracking the consistency of personal habits, fitness routines, or study schedules. - Presenting time-series data to highlight peak activity periods and identify gaps in performance. ## How it works - Input your activity data using the YYYY-MM-DD|value|label format or a JSON array. - Customize the visual appearance by selecting a color scheme, adjusting cell size, and toggling labels or statistics. - Generate the interactive heatmap to instantly visualize your data patterns. - Download or export the resulting HTML visualization for use in reports or dashboards. ## Use cases - Developer contribution tracking to visualize coding activity and commit frequency. - Personal habit formation monitoring to see streaks and identify days where goals were missed. - Business metric reporting to display daily sales volume or customer support ticket resolution over a fiscal year. ## Frequently asked questions ### What data format is required? You can provide data as a JSON array of objects with 'date', 'value', and 'label' keys, or as a simple text list using the 'YYYY-MM-DD|value|label' format. ### Can I use custom colors? Yes, select the 'Custom Colors' option in the color scheme dropdown to define your own start and end colors for the intensity gradient. ### Does it support years other than the current one? Yes, you can specify any year between 2000 and 2030 in the 'Year' field to generate historical or future-projected heatmaps. ### Can I display the actual values inside the cells? Yes, enable the 'Show Values in Cells' checkbox, though this is recommended only when using larger cell sizes for better readability. ### Is the heatmap interactive? Yes, the generated heatmap includes hover tooltips that display the specific date, value, and label when you move your cursor over individual cells. ## Related tools - [Venn Diagram Generator](https://elysiatools.com/en/tools/euler-diagram-generator): Generate customizable Venn diagrams to visualize set relationships, intersections, exclusions, and hierarchical structures - [Histogram Maker](https://elysiatools.com/en/tools/histogram-maker): Bin numeric data into intervals and draw a histogram to visualize a statistical distribution - [Grouped Bar Chart Generator](https://elysiatools.com/en/tools/grouped-bar-chart): Generate grouped bar charts for comparing multiple categories side by side, perfect for multi-category comparisons and comparative analysis - [Stream Graph Generator](https://elysiatools.com/en/tools/stream-graph): Generate smooth stream graphs for visualizing time-series data flow, perfect for showing changes in composition over time with organic, flowing shapes - [Area Chart Generator](https://elysiatools.com/en/tools/area-chart-generator): Generate customizable area charts from data with filled areas under lines, perfect for showing trends and cumulative data - [Bar Chart Generator](https://elysiatools.com/en/tools/bar-chart-generator): Generate customizable bar charts from data with various styling options - [Bubble Chart Generator](https://elysiatools.com/en/tools/bubble-chart-generator): Generate customizable bubble charts from data with three dimensions (x, y, size) - [Donut Chart Generator](https://elysiatools.com/en/tools/donut-chart-generator): Generate customizable donut charts (ring charts) from data with various styling options, perfect for showing proportions with a central space ## Samples - [ICS Calendar Samples](https://elysiatools.com/en/samples/ics-samples): Sample iCalendar (.ics) files for testing calendar import, event parsing, reminders, and recurring schedules - [Grafana Advanced Application Samples](https://elysiatools.com/en/samples/grafana-samples): Comprehensive Grafana samples covering advanced dashboard design, alerting configurations, data source integrations, and plugin development - [Web Image Processing Python Samples](https://elysiatools.com/en/samples/web-image-processing-python): Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion - [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion ## Related content - [Chart and Diagram Generators](https://elysiatools.com/en/hubs/chart-diagram-generators): Generate bar, line, pie, donut, scatter, radar, Gantt, Sankey, heatmap, funnel, treemap, and dozens more charts and diagrams from your own data in one visualization hub. - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Image Format Conversion and Animated Export Tools](https://elysiatools.com/en/hubs/image-convert): Compare image format converters for JPG, PNG, GIF, AVIF, WebP, TIFF, ICO, base64, and animation-friendly exports in one hub. - [JSON Interchange and Format Translation Tools](https://elysiatools.com/en/hubs/json-convert): Compare JSON conversion tools for CSV, YAML, TOML, GraphQL, XML, Markdown, Excel, BSON, EDN, and related structured formats in one hub.