diff --git a/NucleicRemote/NucleicRemote/Views/HomeView.swift b/NucleicRemote/NucleicRemote/Views/HomeView.swift
index 449e128..696e20b 100644
--- a/NucleicRemote/NucleicRemote/Views/HomeView.swift
+++ b/NucleicRemote/NucleicRemote/Views/HomeView.swift
@@ -192,6 +192,9 @@ struct ActivityGrid: View {
         let weekday = cal.component(.weekday, from: today)
         let startOfWeek = cal.date(byAdding: .day, value: -(weekday - 1), to: today)!
         let gridStart = cal.date(byAdding: .day, value: -7 * (weeks - 1), to: startOfWeek)!
+        // Brightness relative to *this user's* activity, outliers excluded so a few marathon
+        // days don't crush the everyday range. Computed once for the whole grid (mirrors Mac).
+        let scale = ActivityScale(activityByDay: activityByDay)
         return HStack(alignment: .top, spacing: gap) {
             ForEach(0..<weeks, id: \.self) { col in
                 VStack(spacing: gap) {
@@ -202,7 +205,7 @@ struct ActivityGrid: View {
                         RoundedRectangle(cornerRadius: 2)
                             .fill(isFuture ? Color.clear
                                 : isFrozen ? Palette.frozen
-                                : Palette.activity(level: Self.level(activityByDay[date] ?? 0)))
+                                : Palette.activity(intensity: scale.intensity(for: activityByDay[date] ?? 0)))
                             .frame(width: cell, height: cell)
                     }
                 }
@@ -210,13 +213,4 @@ struct ActivityGrid: View {
         }
         .frame(maxWidth: .infinity, alignment: .leading)
     }
-
-    static func level(_ count: Int) -> Int {
-        switch count {
-        case 0: 0
-        case 1...2: 1
-        case 3...5: 2
-        default: 3
-        }
-    }
 }