diff --git a/PRD.md b/PRD.md
index a67b46c..bd0919e 100644
--- a/PRD.md
+++ b/PRD.md
@@ -31,7 +31,7 @@ TheNoiseClock is a SwiftUI-based iOS application that combines a customizable di
 - **Opacity controls**: Separate opacity for clock digits and overlays
 - **Random color mode**: Automatically changes digit color every minute
 - **Preset themes**: Quick "Night" (black/white) and "Day" (white/black) themes
-- **Font family selection**: Choose from System, San Francisco, Monaco, Courier fonts
+- **Font family selection**: Choose from System, Helvetica, Arial, Times New Roman, Georgia, Verdana, Monaco, Courier fonts
 - **Font weight options**: Ultra Light, Thin, Light, Regular, Medium, Semibold, Bold, Heavy, Black
 - **Font design choices**: Default, Serif, Rounded, Monospaced designs
 - **Live font preview**: Real-time preview of font changes in settings
@@ -111,7 +111,7 @@ TheNoiseClock is a SwiftUI-based iOS application that combines a customizable di
 - **Perfect centering**: Each digit is centered within its fixed-width container
 
 ### Font Customization System
-- **Font family selection**: System, San Francisco, Monaco, Courier options
+- **Font family selection**: System, Helvetica, Arial, Times New Roman, Georgia, Verdana, Monaco, Courier options
 - **Weight variations**: 9 weight options from Ultra Light to Black
 - **Design choices**: Default, Serif, Rounded, Monospaced designs
 - **Live preview**: Real-time font preview in settings interface
diff --git a/TheNoiseClock/Core/Utilities/FontUtils.swift b/TheNoiseClock/Core/Utilities/FontUtils.swift
index f2c3433..fa89169 100644
--- a/TheNoiseClock/Core/Utilities/FontUtils.swift
+++ b/TheNoiseClock/Core/Utilities/FontUtils.swift
@@ -128,10 +128,18 @@ enum FontUtils {
     /// - Returns: SwiftUI Font
     static func fontFamily(_ family: String) -> Font {
         switch family {
-        case "San Francisco":
-            return .system(.body, design: .default)
         case "System":
             return .system(.body, design: .default)
+        case "Helvetica":
+            return .custom("Helvetica", size: 17)
+        case "Arial":
+            return .custom("Arial", size: 17)
+        case "Times New Roman":
+            return .custom("Times New Roman", size: 17)
+        case "Georgia":
+            return .custom("Georgia", size: 17)
+        case "Verdana":
+            return .custom("Verdana", size: 17)
         case "Monaco":
             return .system(.body, design: .monospaced)
         case "Courier":
@@ -200,11 +208,19 @@ enum FontUtils {
         weight: String,
         design: String
     ) -> Font {
-        return .system(
-            size: size,
-            weight: fontWeight(weight),
-            design: fontDesign(design)
-        )
+        // For system fonts, use the system font with design
+        if family == "System" || family == "Monaco" || family == "Courier" {
+            return .system(
+                size: size,
+                weight: fontWeight(weight),
+                design: fontDesign(design)
+            )
+        }
+        
+        // For custom fonts, create with weight
+        let fontWeight = fontWeight(weight)
+        return .custom(family, size: size)
+            .weight(fontWeight)
     }
     
     /// Calculate the maximum width for any two-digit combination
@@ -305,10 +321,16 @@ enum FontUtils {
             uiDesign = .default
         }
         
-        let descriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: .body)
-            .withDesign(uiDesign) ?? UIFontDescriptor.preferredFontDescriptor(withTextStyle: .body)
+        // For system fonts, use system font descriptor with design
+        if family == "System" || family == "Monaco" || family == "Courier" {
+            let descriptor = UIFontDescriptor.preferredFontDescriptor(withTextStyle: .body)
+                .withDesign(uiDesign) ?? UIFontDescriptor.preferredFontDescriptor(withTextStyle: .body)
+            
+            return UIFont(descriptor: descriptor.addingAttributes([.traits: [UIFontDescriptor.TraitKey.weight: uiWeight]]), size: size)
+        }
         
-        return UIFont(descriptor: descriptor.addingAttributes([.traits: [UIFontDescriptor.TraitKey.weight: uiWeight]]), size: size)
+        // For custom fonts, create with family name and weight
+        return UIFont(name: family, size: size) ?? UIFont.systemFont(ofSize: size, weight: uiWeight)
     }
     
     /// Measure text size with given font
diff --git a/TheNoiseClock/Views/Clock/ClockSettingsView.swift b/TheNoiseClock/Views/Clock/ClockSettingsView.swift
index c0937bc..e3ad5f4 100644
--- a/TheNoiseClock/Views/Clock/ClockSettingsView.swift
+++ b/TheNoiseClock/Views/Clock/ClockSettingsView.swift
@@ -55,7 +55,7 @@ struct ClockSettingsView: View {
 private struct FontSection: View {
     @Binding var style: ClockStyle
     
-    private let fontFamilies = ["System", "San Francisco", "Monaco", "Courier"]
+    private let fontFamilies = ["System", "Arial", "Courier", "Georgia", "Helvetica", "Monaco", "Times New Roman", "Verdana"]
     private let fontWeights = ["Ultra Light", "Thin", "Light", "Regular", "Medium", "Semibold", "Bold", "Heavy", "Black"]
     private let fontDesigns = ["Default", "Serif", "Rounded", "Monospaced"]