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Data Visualization

Calendar Heatmap Generator

· Last updated：2025-11-06

Generate GitHub-style calendar heatmaps to visualize activity patterns over time, perfect for tracking yearly contributions, habits, or metrics

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Written by the Elysia Tools team
Visualization69
Data Visualization57
Graph27
Time Series8

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Data Visualization
Input types
textarea, text, select, number, color, checkbox
Output type
html
Sample coverage
4
API ready
Yes

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.

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

  1. 1Input your activity data using the YYYY-MM-DD|value|label format or a JSON array.
  2. 2Customize the visual appearance by selecting a color scheme, adjusting cell size, and toggling labels or statistics.
  3. 3Generate the interactive heatmap to instantly visualize your data patterns.
  4. 4Download 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.

Examples

1. Annual Coding Contribution Tracker

Software Developer

Background

A developer wants to visualize their yearly commit history to maintain a consistent coding streak.

Problem

Standard logs are difficult to read and don't show long-term patterns of activity.

How to use

Paste the commit history data into the Activity Data field and select the 'Green (GitHub style)' color scheme.

{"colorScheme": "green", "showStats": true, "showTooltip": true}

Outcome

A clear, green-shaded heatmap showing daily commit intensity, making it easy to spot productive months and periods of inactivity.

2. Daily Habit Consistency Dashboard

Fitness Enthusiast

Background

A user is tracking their daily workout duration to ensure they meet their fitness goals throughout the year.

Problem

It is hard to see if they are maintaining a regular workout schedule over several months.

How to use

Input daily workout minutes as values, set the color scheme to 'Blue', and enable the 'Show Statistics' option.

FAQ

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.

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{"colorScheme": "blue", "showMonthLabels": true, "showStats": true}

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