diff --git a/habitify.py b/habitify.py
new file mode 100644
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+++ b/habitify.py
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+#!/usr/bin/env python3
+import os
+import json
+import datetime
+import typepip install typer richr
+from rich.console import Console
+from rich.table import Table
+
+app = typer.Typer(help="📈 Habitify: Simple CLI habit tracker")
+console = Console()
+
+# Where we store your data
+DATA_PATH = os.path.expanduser("~/.habitify.json")
+
+def load_data():
+    if not os.path.exists(DATA_PATH):
+        return {"habits": {}}
+    with open(DATA_PATH, "r") as f:
+        return json.load(f)
+
+def save_data(data):
+    os.makedirs(os.path.dirname(DATA_PATH), exist_ok=True)
+    with open(DATA_PATH, "w") as f:
+        json.dump(data, f, indent=2)
+
+def today_str():
+    return datetime.date.today().isoformat()
+
+def compute_streak(dates):
+    s = set(dates)
+    # current streak
+    streak = 0
+    d = datetime.date.today()
+    while d.isoformat() in s:
+        streak += 1
+        d -= datetime.timedelta(days=1)
+    # longest streak
+    longest = 0
+    dates_sorted = sorted(s)
+    curr = 1
+    for i in range(1, len(dates_sorted)):
+        prev = datetime.date.fromisoformat(dates_sorted[i-1])
+        currd = datetime.date.fromisoformat(dates_sorted[i])
+        if (currd - prev).days == 1:
+            curr += 1
+        else:
+            longest = max(longest, curr)
+            curr = 1
+    longest = max(longest, curr)
+    return streak, longest
+
+@app.command()
+def add(name: str = typer.Argument(..., help="Name of the new habit")):
+    """Add a new habit to track."""
+    data = load_data()
+    if name in data["habits"]:
+        console.print(f"[yellow]Habit '{name}' already exists.[/yellow]")
+        raise typer.Exit()
+    data["habits"][name] = {"dates": []}
+    save_data(data)
+    console.print(f"[green]Added habit:[/green] '{name}'")
+
+@app.command()
+def list():
+    """List all your habits."""
+    data = load_data()
+    if not data["habits"]:
+        console.print("[red]No habits yet. Use 'habitify add NAME' to create one.[/red]")
+        raise typer.Exit()
+    table = Table(title="Your Habits")
+    table.add_column("Habit", style="cyan")
+    table.add_column("Logged Days", justify="right")
+    table.add_column("Current Streak", justify="right")
+    table.add_column("Longest Streak", justify="right")
+    for name, info in data["habits"].items():
+        dates = info["dates"]
+        streak, longest = compute_streak(dates)
+        table.add_row(name, str(len(dates)), str(streak), str(longest))
+    console.print(table)
+
+@app.command()
+def done(name: str = typer.Argument(..., help="Mark habit as done for today")):
+    """Mark a habit as completed for today."""
+    data = load_data()
+    if name not in data["habits"]:
+        console.print(f"[red]Habit '{name}' not found.[/red]")
+        raise typer.Exit()
+    t = today_str()
+    if t in data["habits"][name]["dates"]:
+        console.print(f"[yellow]Already marked '{name}' done today.[/yellow]")
+        raise typer.Exit()
+    data["habits"][name]["dates"].append(t)
+    save_data(data)
+    console.print(f"[green]Great job![/green] Marked '{name}' as done on {t}.")
+
+@app.command()
+def history(name: str = typer.Argument(..., help="Show completion dates for a habit")):
+    """Show all dates you completed a habit."""
+    data = load_data()
+    if name not in data["habits"]:
+        console.print(f"[red]Habit '{name}' not found.[/red]")
+        raise typer.Exit()
+    dates = sorted(data["habits"][name]["dates"])
+    if not dates:
+        console.print(f"[yellow]No entries yet for '{name}'.[/yellow]")
+        raise typer.Exit()
+    table = Table(title=f"History for '{name}'")
+    table.add_column("Date", style="magenta")
+    for d in dates:
+        table.add_row(d)
+    console.print(table)
+
+if __name__ == "__main__":
+    app()