diff --git a/lib/phlexy_ui/theme_controller.rb b/lib/phlexy_ui/theme_controller.rb
new file mode 100644
index 0000000..14a716d
--- /dev/null
+++ b/lib/phlexy_ui/theme_controller.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+module PhlexyUI
+  # @component html class="theme-controller"
+  # Theme controller changes the theme when checkbox/radio is checked
+  # Supports common patterns: swap, toggle, dropdown, radio buttons
+  class ThemeController < Base
+    register_modifiers(
+      # "sm:swap"
+      # "md:swap"
+      # "lg:swap"
+      swap: "swap",
+      # "sm:swap sm:swap-rotate"
+      # "md:swap md:swap-rotate"
+      # "lg:swap lg:swap-rotate"
+      swap_rotate: "swap swap-rotate",
+      # "sm:swap sm:swap-flip"
+      # "md:swap md:swap-flip"
+      # "lg:swap lg:swap-flip"
+      swap_flip: "swap swap-flip",
+      # "sm:toggle"
+      # "md:toggle"
+      # "lg:toggle"
+      toggle: "toggle"
+    )
+
+    def initialize(*, theme_value: nil, checked: false, as: :input, **)
+      super(*, **)
+      @theme_value = theme_value
+      @checked = checked
+      @as = as
+    end
+
+    def view_template(&block)
+      input_classes = generate_classes!(
+        # "theme-controller"
+        component_html_class: :"theme-controller",
+        modifiers_map: {},
+        base_modifiers: [],
+        options: {}
+      )
+
+      attrs = {type: :checkbox, class: input_classes}
+      attrs[:value] = theme_value if theme_value
+      attrs[:checked] = true if checked
+      attrs.merge!(options)
+
+      if block
+        # If block given, wrap in label with modifier classes (swap, toggle, etc.)
+        wrapper_classes = generate_classes!(
+          component_html_class: nil,
+          modifiers_map: modifiers,
+          base_modifiers:,
+          options: {}
+        )
+
+        label(class: wrapper_classes) do
+          public_send(as, **attrs)
+          whitespace
+          block.call
+          whitespace
+        end
+      else
+        # Just render the input
+        public_send(as, **attrs)
+      end
+    end
+
+    private
+
+    attr_reader :theme_value, :checked
+  end
+end
diff --git a/spec/lib/phlexy_ui/theme_controller_spec.rb b/spec/lib/phlexy_ui/theme_controller_spec.rb
new file mode 100644
index 0000000..dd6a446
--- /dev/null
+++ b/spec/lib/phlexy_ui/theme_controller_spec.rb
@@ -0,0 +1,74 @@
+require "spec_helper"
+
+describe PhlexyUI::ThemeController do
+  subject(:output) { render described_class.new }
+
+  it "is expected to match the formatted HTML" do
+    expected_html = html <<~HTML
+      <input type="checkbox" class="theme-controller">
+    HTML
+
+    is_expected.to eq(expected_html)
+  end
+
+  describe "with theme_value" do
+    subject(:output) do
+      render described_class.new(theme_value: "dark")
+    end
+
+    it "renders with value attribute" do
+      expected_html = html <<~HTML
+        <input type="checkbox" class="theme-controller" value="dark">
+      HTML
+
+      expect(output).to eq(expected_html)
+    end
+  end
+
+  describe "with checked" do
+    subject(:output) do
+      render described_class.new(theme_value: "dark", checked: true)
+    end
+
+    it "renders as checked" do
+      expected_html = html <<~HTML
+        <input type="checkbox" class="theme-controller" value="dark" checked>
+      HTML
+
+      expect(output).to eq(expected_html)
+    end
+  end
+
+  describe "with block for swap pattern" do
+    subject(:output) do
+      render described_class.new(:swap_rotate, theme_value: "dark") do
+        "🌞 🌙"
+      end
+    end
+
+    it "wraps in label with icons" do
+      expected_html = html <<~HTML
+        <label class="swap swap-rotate">
+          <input type="checkbox" class="theme-controller" value="dark">
+          🌞 🌙
+        </label>
+      HTML
+
+      expect(output).to eq(expected_html)
+    end
+  end
+
+  describe "data" do
+    subject(:output) do
+      render described_class.new(data: {foo: "bar"})
+    end
+
+    it "renders it correctly" do
+      expected_html = html <<~HTML
+        <input type="checkbox" class="theme-controller" data-foo="bar">
+      HTML
+
+      expect(output).to eq(expected_html)
+    end
+  end
+end