diff --git a/Examples/Sources/AdvancedCustomizationExample/AdvancedCustomizationApp.swift b/Examples/Sources/AdvancedCustomizationExample/AdvancedCustomizationApp.swift
index 6b851e5299b..13c49e4e0fd 100644
--- a/Examples/Sources/AdvancedCustomizationExample/AdvancedCustomizationApp.swift
+++ b/Examples/Sources/AdvancedCustomizationExample/AdvancedCustomizationApp.swift
@@ -119,7 +119,8 @@ struct CounterApp: App {
                             #elseif canImport(UIKitBackend)
                                 textField.borderStyle = .bezel
                             #elseif canImport(WinUIBackend)
-                                textField.selectionHighlightColor.color = .init(a: 255, r: 0, g: 255, b: 0)
+                                textField.selectionHighlightColor.color = .init(
+                                    a: 255, r: 0, g: 255, b: 0)
                                 let brush = WinUI.SolidColorBrush()
                                 brush.color = .init(a: 255, r: 0, g: 0, b: 255)
                                 textField.background = brush
diff --git a/Examples/Sources/ControlsExample/ControlsApp.swift b/Examples/Sources/ControlsExample/ControlsApp.swift
index 81ac16adab3..89b7ec486b1 100644
--- a/Examples/Sources/ControlsExample/ControlsApp.swift
+++ b/Examples/Sources/ControlsExample/ControlsApp.swift
@@ -17,6 +17,8 @@ struct ControlsApp: App {
     @State var flavor: String? = nil
     @State var enabled = true
     @State var menuToggleState = false
+    @State var progressViewSize: Int = 10
+    @State var isProgressViewResizable = true
 
     var body: some Scene {
         WindowGroup("ControlsApp") {
@@ -83,11 +85,21 @@ struct ControlsApp: App {
                             Text("Value: \(text)")
                         }
 
+                        VStack {
+                            Toggle(
+                                "Enable ProgressView resizability", isOn: $isProgressViewResizable)
+                            Slider(value: $progressViewSize, in: 10...100)
+                            ProgressView()
+                                .resizable(isProgressViewResizable)
+                                .frame(width: progressViewSize, height: progressViewSize)
+                        }
+
                         VStack {
                             Text("Drop down")
                             HStack {
                                 Text("Flavor: ")
-                                Picker(of: ["Vanilla", "Chocolate", "Strawberry"], selection: $flavor)
+                                Picker(
+                                    of: ["Vanilla", "Chocolate", "Strawberry"], selection: $flavor)
                             }
                             Text("You chose: \(flavor ?? "Nothing yet!")")
                         }
diff --git a/Sources/AppKitBackend/AppKitBackend.swift b/Sources/AppKitBackend/AppKitBackend.swift
index 23d2fa30abb..4e8177c6d4f 100644
--- a/Sources/AppKitBackend/AppKitBackend.swift
+++ b/Sources/AppKitBackend/AppKitBackend.swift
@@ -502,6 +502,15 @@ public final class AppKitBackend: AppBackend {
     }
 
     public func naturalSize(of widget: Widget) -> SIMD2<Int> {
+        if let spinner = widget.subviews.first as? NSProgressIndicator,
+            spinner.style == .spinning
+        {
+            let size = spinner.intrinsicContentSize
+            return SIMD2(
+                Int(size.width),
+                Int(size.height)
+            )
+        }
         let size = widget.intrinsicContentSize
         return SIMD2(
             Int(size.width),
@@ -1199,11 +1208,32 @@ public final class AppKitBackend: AppBackend {
     }
 
     public func createProgressSpinner() -> Widget {
+        let container = NSView()
+        let spinner = NSProgressIndicator()
+        spinner.translatesAutoresizingMaskIntoConstraints = false
+        spinner.isIndeterminate = true
+        spinner.style = .spinning
+        spinner.startAnimation(nil)
+        container.addSubview(spinner)
+        return container
+    }
+
+    public func setSize(
+        ofProgressSpinner widget: Widget,
+        to size: SIMD2<Int>
+    ) {
+        guard Int(widget.frame.size.height) != size.y else { return }
+        setSize(of: widget, to: size)
         let spinner = NSProgressIndicator()
+        spinner.translatesAutoresizingMaskIntoConstraints = false
         spinner.isIndeterminate = true
         spinner.style = .spinning
         spinner.startAnimation(nil)
-        return spinner
+        spinner.widthAnchor.constraint(equalToConstant: CGFloat(size.x)).isActive = true
+        spinner.heightAnchor.constraint(equalToConstant: CGFloat(size.y)).isActive = true
+
+        widget.subviews = []
+        widget.addSubview(spinner)
     }
 
     public func createProgressBar() -> Widget {
diff --git a/Sources/AppKitBackend/InspectionModifiers.swift b/Sources/AppKitBackend/InspectionModifiers.swift
index 24e17205f26..fa4d7bd0f3e 100644
--- a/Sources/AppKitBackend/InspectionModifiers.swift
+++ b/Sources/AppKitBackend/InspectionModifiers.swift
@@ -91,7 +91,8 @@ extension Image {
         _ inspectionPoints: InspectionPoints = .onCreate,
         _ action: @escaping @MainActor @Sendable (NSImageView) -> Void
     ) -> some View {
-        InspectView(child: self, inspectionPoints: inspectionPoints) { (_: NSView, children: ImageChildren) in
+        InspectView(child: self, inspectionPoints: inspectionPoints) {
+            (_: NSView, children: ImageChildren) in
             action(children.imageWidget.into())
         }
     }
diff --git a/Sources/AppKitBackend/NSViewRepresentable.swift b/Sources/AppKitBackend/NSViewRepresentable.swift
index c127582263f..7a404e48f08 100644
--- a/Sources/AppKitBackend/NSViewRepresentable.swift
+++ b/Sources/AppKitBackend/NSViewRepresentable.swift
@@ -86,9 +86,11 @@ extension NSViewRepresentable {
         let growsHorizontally = nsView.contentHuggingPriority(for: .horizontal) < .defaultHigh
         let growsVertically = nsView.contentHuggingPriority(for: .vertical) < .defaultHigh
 
-        let idealWidth = intrinsicSize.width == NSView.noIntrinsicMetric
+        let idealWidth =
+            intrinsicSize.width == NSView.noIntrinsicMetric
             ? 10 : intrinsicSize.width
-        let idealHeight = intrinsicSize.height == NSView.noIntrinsicMetric
+        let idealHeight =
+            intrinsicSize.height == NSView.noIntrinsicMetric
             ? 10 : intrinsicSize.height
 
         // When the view doesn't grow along a dimension, we use its fittingSize
diff --git a/Sources/Gtk3/Utility/GSimpleAction.swift b/Sources/Gtk3/Utility/GSimpleAction.swift
index e2c00e31c9c..a5274419b34 100644
--- a/Sources/Gtk3/Utility/GSimpleAction.swift
+++ b/Sources/Gtk3/Utility/GSimpleAction.swift
@@ -51,11 +51,11 @@ public class GSimpleAction: GAction, GObjectRepresentable {
     private func connectActionSignal(
         _ value: some AnyObject,
         handler:
-        @convention(c) (
-            UnsafeMutableRawPointer,
-            OpaquePointer,
-            UnsafeMutableRawPointer
-        ) -> Void
+            @convention(c) (
+                UnsafeMutableRawPointer,
+                OpaquePointer,
+                UnsafeMutableRawPointer
+            ) -> Void
     ) {
         g_signal_connect_data(
             UnsafeMutableRawPointer(actionPointer),
diff --git a/Sources/Gtk3Backend/InspectionModifiers.swift b/Sources/Gtk3Backend/InspectionModifiers.swift
index 35edd818b12..5b8ff98d395 100644
--- a/Sources/Gtk3Backend/InspectionModifiers.swift
+++ b/Sources/Gtk3Backend/InspectionModifiers.swift
@@ -80,7 +80,8 @@ extension SwiftCrossUI.Image {
         _ inspectionPoints: InspectionPoints = .onCreate,
         _ action: @escaping @MainActor @Sendable (Gtk3.Image) -> Void
     ) -> some View {
-        InspectView(child: self, inspectionPoints: inspectionPoints) { (_: Gtk3.Widget, children: ImageChildren) in
+        InspectView(child: self, inspectionPoints: inspectionPoints) {
+            (_: Gtk3.Widget, children: ImageChildren) in
             action(children.imageWidget.into())
         }
     }
diff --git a/Sources/GtkBackend/InspectionModifiers.swift b/Sources/GtkBackend/InspectionModifiers.swift
index c791d7e73ea..cd63391c765 100644
--- a/Sources/GtkBackend/InspectionModifiers.swift
+++ b/Sources/GtkBackend/InspectionModifiers.swift
@@ -89,7 +89,8 @@ extension SwiftCrossUI.Image {
         _ inspectionPoints: InspectionPoints = .onCreate,
         _ action: @escaping @MainActor @Sendable (Gtk.Picture) -> Void
     ) -> some View {
-        InspectView(child: self, inspectionPoints: inspectionPoints) { (_: Gtk.Widget, children: ImageChildren) in
+        InspectView(child: self, inspectionPoints: inspectionPoints) {
+            (_: Gtk.Widget, children: ImageChildren) in
             action(children.imageWidget.into())
         }
     }
diff --git a/Sources/SwiftCrossUI/Backend/AnyWidget.swift b/Sources/SwiftCrossUI/Backend/AnyWidget.swift
index eeffd34225e..49bd6bc859d 100644
--- a/Sources/SwiftCrossUI/Backend/AnyWidget.swift
+++ b/Sources/SwiftCrossUI/Backend/AnyWidget.swift
@@ -23,7 +23,9 @@ public class AnyWidget {
         for backend: Backend.Type
     ) -> Backend.Widget {
         guard let widget = widget as? Backend.Widget else {
-            fatalError("AnyWidget used with incompatible backend \(backend); widget type is \(type(of: widget))")
+            fatalError(
+                "AnyWidget used with incompatible backend \(backend); widget type is \(type(of: widget))"
+            )
         }
         return widget
     }
@@ -33,7 +35,9 @@ public class AnyWidget {
     /// more concise than using ``AnyWidget/concreteWidget(for:)``.
     public func into<T>() -> T {
         guard let widget = widget as? T else {
-            fatalError("AnyWidget used with incompatible widget type \(T.self); actual widget type is \(type(of: widget))")
+            fatalError(
+                "AnyWidget used with incompatible widget type \(T.self); actual widget type is \(type(of: widget))"
+            )
         }
         return widget
     }
diff --git a/Sources/SwiftCrossUI/Backend/AppBackend.swift b/Sources/SwiftCrossUI/Backend/AppBackend.swift
index 6641ff9d71f..1d2eb976833 100644
--- a/Sources/SwiftCrossUI/Backend/AppBackend.swift
+++ b/Sources/SwiftCrossUI/Backend/AppBackend.swift
@@ -550,6 +550,16 @@ public protocol AppBackend: Sendable {
     /// Creates an indeterminate progress spinner.
     func createProgressSpinner() -> Widget
 
+    /// Sets the size of a progress spinner.
+    ///
+    /// This method exists because AppKitBackend requires special handling to resize progress spinners.
+    ///
+    /// The default implementation forwards to ``AppBackend/setSize(of:to:)``.
+    func setSize(
+        ofProgressSpinner widget: Widget,
+        to size: SIMD2<Int>
+    )
+
     /// Creates a progress bar.
     func createProgressBar() -> Widget
     /// Updates a progress bar to reflect the given progress (between 0 and 1), and the
@@ -1123,6 +1133,13 @@ extension AppBackend {
         todo()
     }
 
+    public func setSize(
+        ofProgressSpinner widget: Widget,
+        to size: SIMD2<Int>
+    ) {
+        setSize(of: widget, to: size)
+    }
+
     public func createProgressBar() -> Widget {
         todo()
     }
diff --git a/Sources/SwiftCrossUI/Scenes/AlertScene.swift b/Sources/SwiftCrossUI/Scenes/AlertScene.swift
index 137cf7db478..885056d9775 100644
--- a/Sources/SwiftCrossUI/Scenes/AlertScene.swift
+++ b/Sources/SwiftCrossUI/Scenes/AlertScene.swift
@@ -73,7 +73,7 @@ public final class AlertSceneNode: SceneGraphNode {
             }
 
             self.alert = alert
-        } else if !scene.isPresented, let alert  {
+        } else if !scene.isPresented, let alert {
             backend.dismissAlert(alert as! Backend.Alert, window: nil)
             self.alert = nil
         }
diff --git a/Sources/SwiftCrossUI/Views/Menu.swift b/Sources/SwiftCrossUI/Views/Menu.swift
index df8519d4f03..4454175a589 100644
--- a/Sources/SwiftCrossUI/Views/Menu.swift
+++ b/Sources/SwiftCrossUI/Views/Menu.swift
@@ -96,8 +96,9 @@ extension Menu: TypeSafeView {
                     action: {}
                 )
             case .menuButton:
-                let menu = children.menu.flatMap { $0 as? Backend.Menu }
-                    ?? backend.createPopoverMenu() 
+                let menu =
+                    children.menu.flatMap { $0 as? Backend.Menu }
+                    ?? backend.createPopoverMenu()
                 children.menu = menu
                 backend.updateButton(
                     widget,
diff --git a/Sources/SwiftCrossUI/Views/ProgressView.swift b/Sources/SwiftCrossUI/Views/ProgressView.swift
index abd34ca147c..f3ebabba358 100644
--- a/Sources/SwiftCrossUI/Views/ProgressView.swift
+++ b/Sources/SwiftCrossUI/Views/ProgressView.swift
@@ -4,6 +4,7 @@ public struct ProgressView<Label: View>: View {
     private var label: Label
     private var progress: Double?
     private var kind: Kind
+    private var isSpinnerResizable: Bool = false
 
     private enum Kind {
         case spinner
@@ -23,7 +24,7 @@ public struct ProgressView<Label: View>: View {
     private var progressIndicator: some View {
         switch kind {
             case .spinner:
-                ProgressSpinnerView()
+                ProgressSpinnerView(isResizable: isSpinnerResizable)
             case .bar:
                 ProgressBarView(value: progress)
         }
@@ -50,6 +51,14 @@ public struct ProgressView<Label: View>: View {
         self.kind = .bar
         self.progress = value.map(Double.init)
     }
+
+    /// Makes the ProgressView resize to fit the available space.
+    /// Only affects ``Kind/spinner``.
+    public func resizable(_ isResizable: Bool = true) -> Self {
+        var progressView = self
+        progressView.isSpinnerResizable = isResizable
+        return progressView
+    }
 }
 
 extension ProgressView where Label == EmptyView {
@@ -101,7 +110,11 @@ extension ProgressView where Label == Text {
 }
 
 struct ProgressSpinnerView: ElementaryView {
-    init() {}
+    let isResizable: Bool
+
+    init(isResizable: Bool = false) {
+        self.isResizable = isResizable
+    }
 
     func asWidget<Backend: AppBackend>(backend: Backend) -> Backend.Widget {
         backend.createProgressSpinner()
@@ -113,8 +126,27 @@ struct ProgressSpinnerView: ElementaryView {
         environment: EnvironmentValues,
         backend: Backend
     ) -> ViewLayoutResult {
-        let size = ViewSize(backend.naturalSize(of: widget))
-        return ViewLayoutResult.leafView(size: size)
+        let naturalSize = backend.naturalSize(of: widget)
+
+        guard isResizable else {
+            return ViewLayoutResult.leafView(size: ViewSize(naturalSize))
+        }
+
+        let dimension: Double
+
+        if let proposedWidth = proposedSize.width, let proposedHeight = proposedSize.height {
+            dimension = min(proposedWidth, proposedHeight)
+        } else if let proposedWidth = proposedSize.width {
+            dimension = proposedWidth
+        } else if let proposedHeight = proposedSize.height {
+            dimension = proposedHeight
+        } else {
+            dimension = Double(min(naturalSize.x, naturalSize.y))
+        }
+
+        return ViewLayoutResult.leafView(
+            size: ViewSize(dimension, dimension)
+        )
     }
 
     func commit<Backend: AppBackend>(
@@ -122,7 +154,12 @@ struct ProgressSpinnerView: ElementaryView {
         layout: ViewLayoutResult,
         environment: EnvironmentValues,
         backend: Backend
-    ) {}
+    ) {
+        // Doesn't change the rendered size of ProgressSpinner
+        // on UIKitBackend, but still sets container size to
+        // (width: n, height: n) n = min(proposedSize.x, proposedSize.y)
+        backend.setSize(ofProgressSpinner: widget, to: layout.size.vector)
+    }
 }
 
 struct ProgressBarView: ElementaryView {
diff --git a/Sources/UIKitBackend/InspectionModifiers.swift b/Sources/UIKitBackend/InspectionModifiers.swift
index ba1af35b1c6..19ea355372a 100644
--- a/Sources/UIKitBackend/InspectionModifiers.swift
+++ b/Sources/UIKitBackend/InspectionModifiers.swift
@@ -1,5 +1,5 @@
-import UIKit
 import SwiftCrossUI
+import UIKit
 
 extension View {
     public func inspect(
diff --git a/Sources/UIKitBackend/UIKitBackend+Menu.swift b/Sources/UIKitBackend/UIKitBackend+Menu.swift
index 8feb20d60a0..7f0ad57b66d 100644
--- a/Sources/UIKitBackend/UIKitBackend+Menu.swift
+++ b/Sources/UIKitBackend/UIKitBackend+Menu.swift
@@ -59,11 +59,12 @@ extension UIKitBackend {
             buttonWidget.child.menu = menu.uiMenu
             buttonWidget.child.showsMenuAsPrimaryAction = true
             if #available(iOS 16, tvOS 17, macCatalyst 16, *) {
-                buttonWidget.child.preferredMenuElementOrder = switch environment.menuOrder {
-                    case .automatic: .automatic
-                    case .priority: .priority
-                    case .fixed: .fixed
-                }
+                buttonWidget.child.preferredMenuElementOrder =
+                    switch environment.menuOrder {
+                        case .automatic: .automatic
+                        case .priority: .priority
+                        case .fixed: .fixed
+                    }
             }
         } else {
             preconditionFailure("Current OS is too old to support menu buttons.")
diff --git a/Sources/UIKitBackend/UIViewRepresentable.swift b/Sources/UIKitBackend/UIViewRepresentable.swift
index 5a144c6f988..4c927f8113e 100644
--- a/Sources/UIKitBackend/UIViewRepresentable.swift
+++ b/Sources/UIKitBackend/UIViewRepresentable.swift
@@ -73,9 +73,11 @@ func defaultViewSize(proposal: ProposedViewSize, view: UIView) -> ViewSize {
     let growsHorizontally = view.contentHuggingPriority(for: .horizontal) < .defaultHigh
     let growsVertically = view.contentHuggingPriority(for: .vertical) < .defaultHigh
 
-    let idealWidth = intrinsicSize.width == UIView.noIntrinsicMetric
+    let idealWidth =
+        intrinsicSize.width == UIView.noIntrinsicMetric
         ? 10 : intrinsicSize.width
-    let idealHeight = intrinsicSize.height == UIView.noIntrinsicMetric
+    let idealHeight =
+        intrinsicSize.height == UIView.noIntrinsicMetric
         ? 10 : intrinsicSize.height
 
     // When the view doesn't grow along a dimension, we use its fittingSize
diff --git a/Sources/WinUIBackend/InspectionModifiers.swift b/Sources/WinUIBackend/InspectionModifiers.swift
index 3706e670760..258a2abf94a 100644
--- a/Sources/WinUIBackend/InspectionModifiers.swift
+++ b/Sources/WinUIBackend/InspectionModifiers.swift
@@ -1,5 +1,5 @@
-import WinUI
 import SwiftCrossUI
+import WinUI
 
 extension View {
     public func inspect(
diff --git a/Sources/WinUIBackend/WinUIElementRepresentable.swift b/Sources/WinUIBackend/WinUIElementRepresentable.swift
index 299e7e976b5..e6d22a0e70f 100644
--- a/Sources/WinUIBackend/WinUIElementRepresentable.swift
+++ b/Sources/WinUIBackend/WinUIElementRepresentable.swift
@@ -1,6 +1,6 @@
+import SwiftCrossUI
 import WinUI
 import WindowsFoundation
-import SwiftCrossUI
 
 // Many force tries are required for the WinUI backend but we don't really want them
 // anywhere else so just disable the lint rule at a file level.