diff --git a/windows/Controls/GaugeControl.cs b/windows/Controls/GaugeControl.cs
new file mode 100644
index 0000000..ad1bc56
--- /dev/null
+++ b/windows/Controls/GaugeControl.cs
@@ -0,0 +1,91 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Media;
+
+namespace ClaudeCheckerWindows.Controls;
+
+public class GaugeControl : FrameworkElement
+{
+    public static readonly DependencyProperty PercentProperty =
+        DependencyProperty.Register(nameof(Percent), typeof(double), typeof(GaugeControl),
+            new FrameworkPropertyMetadata(0.0, FrameworkPropertyMetadataOptions.AffectsRender));
+
+    public static readonly DependencyProperty AccentProperty =
+        DependencyProperty.Register(nameof(Accent), typeof(Brush), typeof(GaugeControl),
+            new FrameworkPropertyMetadata(Brushes.Orange, FrameworkPropertyMetadataOptions.AffectsRender));
+
+    public double Percent { get => (double)GetValue(PercentProperty); set => SetValue(PercentProperty, value); }
+    public Brush  Accent  { get => (Brush)GetValue(AccentProperty);   set => SetValue(AccentProperty, value); }
+
+    // Arc sweeps 270° starting at 135° (bottom-left to bottom-right, like macOS version)
+    private const double StartAngleDeg = 135;
+    private const double SweepDeg      = 270;
+    private const double StrokeWidth   = 6;
+
+    protected override void OnRender(DrawingContext dc)
+    {
+        var cx     = RenderSize.Width  / 2;
+        var cy     = RenderSize.Height / 2;
+        var radius = Math.Min(cx, cy) - StrokeWidth / 2 - 1;
+
+        // Track
+        DrawArc(dc, cx, cy, radius, StartAngleDeg, SweepDeg,
+            new Pen(new SolidColorBrush(Color.FromArgb(28, 255, 255, 255)), StrokeWidth));
+
+        // Fill
+        if (Percent > 0)
+        {
+            var sweep = SweepDeg * (Percent / 100.0);
+            DrawArc(dc, cx, cy, radius, StartAngleDeg, sweep, new Pen(Accent, StrokeWidth));
+        }
+
+        var dpi  = VisualTreeHelper.GetDpi(this).PixelsPerDip;
+
+        // Percent label
+        var pctText = new FormattedText(
+            $"{(int)Math.Round(Percent)}%",
+            CultureInfo.CurrentCulture,
+            FlowDirection.LeftToRight,
+            new Typeface(new FontFamily("Segoe UI"), FontStyles.Normal, FontWeights.Bold, FontStretches.Normal),
+            14, Brushes.White, dpi);
+
+        dc.DrawText(pctText, new Point(cx - pctText.Width / 2, cy - pctText.Height - 1));
+
+        // Sub-label
+        var sub = new FormattedText(
+            "Updated\nnow",
+            CultureInfo.CurrentCulture,
+            FlowDirection.LeftToRight,
+            new Typeface("Segoe UI"),
+            7, new SolidColorBrush(Color.FromRgb(0x88, 0x88, 0x88)), dpi);
+        sub.TextAlignment = TextAlignment.Center;
+
+        dc.DrawText(sub, new Point(cx - sub.Width / 2, cy + 2));
+    }
+
+    private static void DrawArc(DrawingContext dc, double cx, double cy, double r,
+        double startDeg, double sweepDeg, Pen pen)
+    {
+        if (sweepDeg <= 0) return;
+
+        var start    = PointOnCircle(cx, cy, r, startDeg);
+        var end      = PointOnCircle(cx, cy, r, startDeg + sweepDeg);
+        var isLarge  = sweepDeg > 180;
+
+        var geo = new StreamGeometry();
+        using (var ctx = geo.Open())
+        {
+            ctx.BeginFigure(start, false, false);
+            ctx.ArcTo(end, new Size(r, r), 0, isLarge, SweepDirection.Clockwise, true, false);
+        }
+        geo.Freeze();
+        dc.DrawGeometry(null, pen, geo);
+    }
+
+    private static Point PointOnCircle(double cx, double cy, double r, double deg)
+    {
+        var rad = deg * Math.PI / 180;
+        return new Point(cx + r * Math.Cos(rad), cy + r * Math.Sin(rad));
+    }
+}