---
title: Github Contribution Heatmap
emoji: 😻
colorFrom: green
colorTo: pink
sdk: gradio
sdk_version: 6.5.1
app_file: contribution_heatmap.py
pinned: false
license: mit
short_description: 'GitHub-style heatmap with gradio''s new html component '
---

# 🟩 ContributionHeatmap

A GitHub-style contribution heatmap component for [Gradio 6](https://www.gradio.app), built entirely with `gr.HTML`. No Svelte, no CLI tooling, no npm — just Python, HTML templates, CSS, and a sprinkle of JS.


---

## Features

- **GitHub-style grid** — 365 cells laid out Sun→Sat × 53 weeks, with month labels and day-of-week markers.
- **6 built-in color themes** — green, blue, purple, orange, pink, red. Themes switch dynamically without losing data.
- **Click-to-edit** — click any cell to cycle its count (0 → 1 → 2 → … → 12 → 0). The `change` event fires on every edit.
- **Auto-computed stats** — longest streak, active days, best day, average per active day, and total contributions are all calculated in the template.
- **Fully reactive** — update `value`, `year`, or any color prop via `gr.HTML(...)` and the entire component re-renders.
- **API / MCP ready** — includes `api_info()` for Gradio's built-in API and MCP support.

---

## Requirements

```
gradio>=6.0
```

No other dependencies. The component is a single Python file.

---

## Quickstart

### Minimal example

```python
import gradio as gr
from contribution_heatmap import ContributionHeatmap

with gr.Blocks() as demo:
    heatmap = ContributionHeatmap()

demo.launch()
```

This renders an empty heatmap for 2025 in the default green theme. Users can click cells to add contributions interactively.

### With initial data

```python
data = {
    "2025-01-15": 4,
    "2025-01-16": 7,
    "2025-01-17": 12,
    "2025-03-01": 2,
}

with gr.Blocks() as demo:
    heatmap = ContributionHeatmap(value=data, year=2025, theme="purple")

demo.launch()
```

---

## Constructor

```python
ContributionHeatmap(
    value: dict | None = None,
    year: int = 2025,
    theme: str = "green",
    c0: str | None = None,
    c1: str | None = None,
    c2: str | None = None,
    c3: str | None = None,
    c4: str | None = None,
    **kwargs,
)
```

| Parameter | Type | Default | Description |
|-----------|------|---------|-------------|
| `value` | `dict \| None` | `{}` | Contribution data. Keys are date strings in `YYYY-MM-DD` format, values are integers (contribution count for that day). |
| `year` | `int` | `2025` | The calendar year to render. |
| `theme` | `str` | `"green"` | One of `"green"`, `"blue"`, `"purple"`, `"orange"`, `"pink"`, `"red"`. Sets the 5-level color palette. |
| `c0`–`c4` | `str \| None` | `None` | Override individual color levels with hex values (e.g. `c4="#ff0000"`). When `None`, colors are derived from `theme`. |
| `**kwargs` | | | Passed through to `gr.HTML` (e.g. `visible`, `elem_id`, `elem_classes`, `container`, `min_height`). |

### Data format

The `value` dict maps date strings to integer counts:

```python
{
    "2025-01-01": 3,   # level 1 (1–2)
    "2025-01-02": 5,   # level 2 (3–5)
    "2025-01-03": 8,   # level 3 (6–9)
    "2025-01-04": 12,  # level 4 (10+)
}
```

Intensity levels are determined by these thresholds:

| Count | Level | Visual |
|-------|-------|--------|
| 0 | 0 | Darkest (empty) |
| 1–2 | 1 | Light |
| 3–5 | 2 | Medium |
| 6–9 | 3 | Bright |
| 10+ | 4 | Brightest |

---

## Updating props

This is the most important pattern to get right. When updating a `ContributionHeatmap` from an event handler, **return `gr.HTML(...)` — not a new `ContributionHeatmap(...)`**. This tells Gradio to update the existing component's props rather than replacing it entirely.

### ✅ Correct: update via `gr.HTML(...)`

```python
# Change only the theme colors (data and year are preserved)
def switch_theme(theme):
    colors = COLOR_SCHEMES[theme]
    return gr.HTML(c0=colors[0], c1=colors[1], c2=colors[2], c3=colors[3], c4=colors[4])

theme_dropdown.change(fn=switch_theme, inputs=[theme_dropdown], outputs=heatmap)
```

```python
# Update everything: data + year + colors
def regenerate(year, theme):
    data = generate_my_data(year)
    colors = COLOR_SCHEMES[theme]
    return gr.HTML(
        value=data,
        year=year,
        c0=colors[0], c1=colors[1], c2=colors[2], c3=colors[3], c4=colors[4],
    )

btn.click(fn=regenerate, inputs=[year_dd, theme_dd], outputs=heatmap)
```

### ❌ Wrong: returning a new instance

```python
# DON'T do this — creates a new component instead of updating props
def switch_theme(theme, data):
    return ContributionHeatmap(value=data, theme=theme)
```

### Helper functions

The module includes two convenience functions for building updates:

```python
from contribution_heatmap import _theme_update, _full_update, COLOR_SCHEMES

# Update colors only
theme_dd.change(fn=_theme_update, inputs=[theme_dd], outputs=heatmap)

# Update data + year + colors
btn.click(
    fn=lambda y, t: _full_update(my_data, y, t),
    inputs=[year_dd, theme_dd],
    outputs=heatmap,
)
```

---

## Events

Since `ContributionHeatmap` extends `gr.HTML`, it supports all standard Gradio HTML events. The most useful one is `change`, which fires when a user clicks a cell:

```python
def on_edit(data):
    """Called whenever a user clicks a cell."""
    total = sum(data.values())
    active = len([v for v in data.values() if v > 0])
    return f"{active} active days, {total} total contributions"

heatmap.change(fn=on_edit, inputs=heatmap, outputs=status_textbox)
```

The `data` received in the handler is the full `value` dict with the updated cell.

---

## Color themes

Six built-in themes are available via the `COLOR_SCHEMES` dict:

```python
from contribution_heatmap import COLOR_SCHEMES

# Each theme is a list of 5 hex colors: [level0, level1, level2, level3, level4]
print(COLOR_SCHEMES["green"])
# ['#161b22', '#0e4429', '#006d32', '#26a641', '#39d353']
```

| Theme | Level 0 | Level 1 | Level 2 | Level 3 | Level 4 |
|-------|---------|---------|---------|---------|---------|
| `green` | `#161b22` | `#0e4429` | `#006d32` | `#26a641` | `#39d353` |
| `blue` | `#161b22` | `#0a3069` | `#0550ae` | `#0969da` | `#54aeff` |
| `purple` | `#161b22` | `#3b1f72` | `#6639a6` | `#8957e5` | `#bc8cff` |
| `orange` | `#161b22` | `#6e3a07` | `#9a5b13` | `#d4821f` | `#f0b040` |
| `pink` | `#161b22` | `#5c1a3a` | `#8b2252` | `#d63384` | `#f472b6` |
| `red` | `#161b22` | `#6e1007` | `#9a2013` | `#d4401f` | `#f06040` |

### Custom colors

You can pass any hex colors directly via `c0`–`c4`:

```python
heatmap = ContributionHeatmap(
    value=data,
    c0="#1a1a2e",
    c1="#16213e",
    c2="#0f3460",
    c3="#533483",
    c4="#e94560",
)
```

Or add your own theme to `COLOR_SCHEMES`:

```python
COLOR_SCHEMES["cyberpunk"] = ["#0a0a0a", "#1a0533", "#3d0066", "#7700cc", "#cc00ff"]
heatmap = ContributionHeatmap(value=data, theme="cyberpunk")
```

---

## Full example app

Below is a complete working app with theme switching, pattern generation, and interactive editing:

```python
import gradio as gr
from contribution_heatmap import (
    ContributionHeatmap,
    COLOR_SCHEMES,
    _theme_update,
    _full_update,
)
import random
from datetime import datetime, timedelta


def generate_data(year, intensity=0.6):
    """Generate random contribution data."""
    data = {}
    start = datetime(year, 1, 1)
    for i in range(365):
        d = start + timedelta(days=i)
        if d > datetime.now():
            break
        if random.random() < intensity:
            data[d.strftime("%Y-%m-%d")] = random.randint(1, 15)
    return data


with gr.Blocks() as demo:
    gr.Markdown("# My Contribution Tracker")

    heatmap = ContributionHeatmap(
        value=generate_data(2025), year=2025, theme="green"
    )

    with gr.Row():
        theme = gr.Dropdown(
            choices=list(COLOR_SCHEMES.keys()), value="green", label="Theme"
        )
        year = gr.Dropdown(choices=[2023, 2024, 2025], value=2025, label="Year")

    regenerate = gr.Button("Regenerate")
    status = gr.Textbox(label="Info", interactive=False)

    # Theme changes — only update colors, preserve data
    theme.change(fn=_theme_update, inputs=[theme], outputs=heatmap)

    # Regenerate — new data + year + colors
    def on_regen(y, t):
        data = generate_data(int(y))
        return _full_update(data, y, t), f"{len(data)} active days"

    regenerate.click(fn=on_regen, inputs=[year, theme], outputs=[heatmap, status])

    # Track edits
    heatmap.change(
        fn=lambda d: f"Edited: {sum((d or {}).values())} total contributions",
        inputs=heatmap,
        outputs=status,
    )


demo.launch()
```

---

## Use cases

- **AI training logs** — visualize daily model training runs, fine-tuning sessions, or evaluation scores.
- **Habit tracking** — meditation streaks, exercise days, reading logs.
- **Coding activity** — render actual GitHub contribution data fetched via their API.
- **Team dashboards** — show multiple heatmaps side-by-side for different team members or projects.
- **Time-series overview** — any data that maps dates to counts.

### Multiple heatmaps

```python
with gr.Blocks() as demo:
    gr.Markdown("# Team Activity")
    with gr.Row():
        alice = ContributionHeatmap(value=alice_data, theme="blue", elem_id="alice")
        bob = ContributionHeatmap(value=bob_data, theme="purple", elem_id="bob")

demo.launch()
```

---

## How it works

This component demonstrates key Gradio 6 `gr.HTML` capabilities:

1. **`html_template`** — JS template strings (`${...}`) render the grid, stats, and legend dynamically from `value`, `year`, and color props.
2. **`css_template`** — CSS is also templated with `${c0}`–`${c4}`, so colors re-render when props change without touching the HTML.
3. **`js_on_load`** — a click handler is attached once using event delegation on the parent element. It updates `props.value` and calls `trigger('change')` to notify Gradio.
4. **Component subclass** — `ContributionHeatmap` extends `gr.HTML`, setting default templates and accepting `theme`/`year`/color props. The `api_info()` method enables API and MCP usage.

---

## API info

When used with Gradio's API or MCP integration, the component exposes:

```json
{
    "type": "object",
    "description": "Dict mapping YYYY-MM-DD to int counts"
}
```

Example API call:

```python
from gradio_client import Client

client = Client("http://localhost:7860")
result = client.predict(
    {"2025-01-01": 5, "2025-01-02": 10},
    api_name="/predict"
)
```

---

## License

MIT