diff --git a/src/renderer/components/Editor/Editor.tsx b/src/renderer/components/Editor/Editor.tsx
index b6d44db..c9b1891 100644
--- a/src/renderer/components/Editor/Editor.tsx
+++ b/src/renderer/components/Editor/Editor.tsx
@@ -14,7 +14,7 @@ import { TagInput } from '../TagInput';
 import { ChatPanel } from '../ChatPanel';
 import { ImportAnalysisView } from '../ImportAnalysisView';
 import { MetadataDiffPanel } from '../MetadataDiffPanel';
-import { AutoSaveManager } from '../../utils';
+import { AutoSaveManager, getContrastColor } from '../../utils';
 import { parseMacros, getMacro } from '../../macros/registry';
 import { InsertModal } from '../InsertModal';
 import { AISuggestionsModal, AISuggestions } from '../AISuggestionsModal/AISuggestionsModal';
@@ -2070,23 +2070,6 @@ interface TagDataWithColor {
   color?: string;
 }
 
-// Get contrasting text color for background
-const getContrastColor = (hex: string): string => {
-  const color = hex.replace('#', '');
-  let r: number, g: number, b: number;
-  if (color.length === 3) {
-    r = parseInt(color[0] + color[0], 16);
-    g = parseInt(color[1] + color[1], 16);
-    b = parseInt(color[2] + color[2], 16);
-  } else {
-    r = parseInt(color.substring(0, 2), 16);
-    g = parseInt(color.substring(2, 4), 16);
-    b = parseInt(color.substring(4, 6), 16);
-  }
-  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
-  return luminance > 0.5 ? '#000000' : '#ffffff';
-};
-
 const Dashboard: React.FC = () => {
   const { posts, media } = useAppStore();
   const [stats, setStats] = useState<DashboardStats | null>(null);
diff --git a/src/renderer/components/Sidebar/Sidebar.tsx b/src/renderer/components/Sidebar/Sidebar.tsx
index 63149a2..3211589 100644
--- a/src/renderer/components/Sidebar/Sidebar.tsx
+++ b/src/renderer/components/Sidebar/Sidebar.tsx
@@ -1,7 +1,7 @@
 import React, { useState, useEffect, useCallback, useMemo, useRef } from 'react';
 import { useAppStore, PostData, MediaData } from '../../store';
 import { showToast } from '../Toast';
-import { groupPostsByStatus } from '../../utils';
+import { getContrastColor, groupPostsByStatus } from '../../utils';
 import type { ChatConversation, ImportDefinitionData } from '../../types/electron';
 import './Sidebar.css';
 
@@ -22,23 +22,6 @@ interface TagData {
   color?: string;
 }
 
-// Get contrasting text color for background
-const getContrastColor = (hex: string): string => {
-  const color = hex.replace('#', '');
-  let r: number, g: number, b: number;
-  if (color.length === 3) {
-    r = parseInt(color[0] + color[0], 16);
-    g = parseInt(color[1] + color[1], 16);
-    b = parseInt(color[2] + color[2], 16);
-  } else {
-    r = parseInt(color.substring(0, 2), 16);
-    g = parseInt(color.substring(2, 4), 16);
-    b = parseInt(color.substring(4, 6), 16);
-  }
-  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
-  return luminance > 0.5 ? '#000000' : '#ffffff';
-};
-
 const formatDate = (dateString: string) => {
   const date = new Date(dateString);
   return date.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' });
diff --git a/src/renderer/components/TagInput/TagInput.tsx b/src/renderer/components/TagInput/TagInput.tsx
index f08c758..690e7f0 100644
--- a/src/renderer/components/TagInput/TagInput.tsx
+++ b/src/renderer/components/TagInput/TagInput.tsx
@@ -1,5 +1,6 @@
 import React, { useState, useEffect, useRef, useCallback } from 'react';
 import { showToast } from '../Toast';
+import { getContrastColor } from '../../utils/color';
 import './TagInput.css';
 
 interface TagData {
@@ -19,23 +20,6 @@ interface TagInputProps {
   disabled?: boolean;
 }
 
-// Get contrasting text color for background
-const getContrastColor = (hex: string): string => {
-  const color = hex.replace('#', '');
-  let r: number, g: number, b: number;
-  if (color.length === 3) {
-    r = parseInt(color[0] + color[0], 16);
-    g = parseInt(color[1] + color[1], 16);
-    b = parseInt(color[2] + color[2], 16);
-  } else {
-    r = parseInt(color.substring(0, 2), 16);
-    g = parseInt(color.substring(2, 4), 16);
-    b = parseInt(color.substring(4, 6), 16);
-  }
-  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
-  return luminance > 0.5 ? '#000000' : '#ffffff';
-};
-
 export const TagInput: React.FC<TagInputProps> = ({
   value,
   onChange,
diff --git a/src/renderer/components/TagsView/TagsView.tsx b/src/renderer/components/TagsView/TagsView.tsx
index bc58747..155aa41 100644
--- a/src/renderer/components/TagsView/TagsView.tsx
+++ b/src/renderer/components/TagsView/TagsView.tsx
@@ -1,6 +1,7 @@
 import React, { useState, useEffect, useCallback } from 'react';
 import { useAppStore } from '../../store';
 import { showToast } from '../Toast';
+import { getContrastColor } from '../../utils/color';
 import './TagsView.css';
 
 // Types
@@ -30,29 +31,6 @@ export const scrollToTagsSection = (category: TagsCategory) => {
   }
 };
 
-// Get contrasting text color for background
-const getContrastColor = (hex: string): string => {
-  // Remove # if present
-  const color = hex.replace('#', '');
-  
-  // Parse hex to RGB
-  let r: number, g: number, b: number;
-  if (color.length === 3) {
-    r = parseInt(color[0] + color[0], 16);
-    g = parseInt(color[1] + color[1], 16);
-    b = parseInt(color[2] + color[2], 16);
-  } else {
-    r = parseInt(color.substring(0, 2), 16);
-    g = parseInt(color.substring(2, 4), 16);
-    b = parseInt(color.substring(4, 6), 16);
-  }
-  
-  // Calculate relative luminance
-  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
-  
-  return luminance > 0.5 ? '#000000' : '#ffffff';
-};
-
 // Color picker presets
 const COLOR_PRESETS = [
   '#ef4444', '#f97316', '#f59e0b', '#eab308', '#84cc16',
diff --git a/src/renderer/utils/color.ts b/src/renderer/utils/color.ts
new file mode 100644
index 0000000..e1107f2
--- /dev/null
+++ b/src/renderer/utils/color.ts
@@ -0,0 +1,20 @@
+export const getContrastColor = (hex: string): string => {
+  const color = hex.replace('#', '');
+
+  let r: number;
+  let g: number;
+  let b: number;
+
+  if (color.length === 3) {
+    r = parseInt(color[0] + color[0], 16);
+    g = parseInt(color[1] + color[1], 16);
+    b = parseInt(color[2] + color[2], 16);
+  } else {
+    r = parseInt(color.substring(0, 2), 16);
+    g = parseInt(color.substring(2, 4), 16);
+    b = parseInt(color.substring(4, 6), 16);
+  }
+
+  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
+  return luminance > 0.5 ? '#000000' : '#ffffff';
+};
\ No newline at end of file
diff --git a/src/renderer/utils/index.ts b/src/renderer/utils/index.ts
index 09131ce..b232a49 100644
--- a/src/renderer/utils/index.ts
+++ b/src/renderer/utils/index.ts
@@ -1,3 +1,4 @@
 export { AutoSaveManager, type AutoSaveConfig } from './autoSave';
+export { getContrastColor } from './color';
 export { unescapeMacroSyntax } from './markdownEscape';
 export { groupPostsByStatus, type GroupedPosts, type PostStatus } from './postGrouping';
diff --git a/tests/renderer/utils/color.test.ts b/tests/renderer/utils/color.test.ts
new file mode 100644
index 0000000..b899653
--- /dev/null
+++ b/tests/renderer/utils/color.test.ts
@@ -0,0 +1,19 @@
+import { describe, it, expect } from 'vitest';
+import { getContrastColor } from '../../../src/renderer/utils/color';
+
+describe('getContrastColor', () => {
+  it('should return black text for light 6-char colors', () => {
+    expect(getContrastColor('#ffffff')).toBe('#000000');
+    expect(getContrastColor('fef3c7')).toBe('#000000');
+  });
+
+  it('should return white text for dark 6-char colors', () => {
+    expect(getContrastColor('#000000')).toBe('#ffffff');
+    expect(getContrastColor('1f2937')).toBe('#ffffff');
+  });
+
+  it('should support 3-char hex colors', () => {
+    expect(getContrastColor('#abc')).toBe('#000000');
+    expect(getContrastColor('333')).toBe('#ffffff');
+  });
+});
\ No newline at end of file