diff --git a/src/shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.svelte.ts b/src/entities/Font/lib/CharacterComparisonEngine/CharacterComparisonEngine.svelte.ts
similarity index 99%
rename from src/shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.svelte.ts
rename to src/entities/Font/lib/CharacterComparisonEngine/CharacterComparisonEngine.svelte.ts
index 1816218..232b621 100644
--- a/src/shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.svelte.ts
+++ b/src/entities/Font/lib/CharacterComparisonEngine/CharacterComparisonEngine.svelte.ts
@@ -13,8 +13,6 @@ const CHAR_PROXIMITY_RANGE_PCT = 5;
 
 /**
  * Default render size in px when callers omit the `size` arg on `layout()`.
- * Kept as a local constant to avoid pulling `$entities/Font` into
- * `$shared/lib` (would create an FSD-illegal upward import cycle).
  */
 const DEFAULT_RENDER_SIZE_PX = 16;
 
diff --git a/src/shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.test.ts b/src/entities/Font/lib/CharacterComparisonEngine/CharacterComparisonEngine.test.ts
similarity index 98%
rename from src/shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.test.ts
rename to src/entities/Font/lib/CharacterComparisonEngine/CharacterComparisonEngine.test.ts
index 09a4f5f..43ed97d 100644
--- a/src/shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.test.ts
+++ b/src/entities/Font/lib/CharacterComparisonEngine/CharacterComparisonEngine.test.ts
@@ -1,4 +1,5 @@
 // @vitest-environment jsdom
+import { installCanvasMock } from '$shared/lib/helpers/__mocks__/canvas';
 import { clearCache } from '@chenglou/pretext';
 import {
     beforeEach,
@@ -6,7 +7,6 @@ import {
     expect,
     it,
 } from 'vitest';
-import { installCanvasMock } from '../__mocks__/canvas';
 import { CharacterComparisonEngine } from './CharacterComparisonEngine.svelte';
 
 // FontA: 10px per character. FontB: 15px per character.
diff --git a/src/entities/Font/lib/index.ts b/src/entities/Font/lib/index.ts
index 161c396..436676c 100644
--- a/src/entities/Font/lib/index.ts
+++ b/src/entities/Font/lib/index.ts
@@ -1,3 +1,9 @@
+export {
+    CharacterComparisonEngine,
+    type ComparisonLine,
+    type ComparisonResult,
+} from './CharacterComparisonEngine/CharacterComparisonEngine.svelte';
+
 export { getFontUrl } from './getFontUrl/getFontUrl';
 
 // Mock data helpers for Storybook and testing
diff --git a/src/shared/lib/helpers/index.ts b/src/shared/lib/helpers/index.ts
index ba2bb77..56a185c 100644
--- a/src/shared/lib/helpers/index.ts
+++ b/src/shared/lib/helpers/index.ts
@@ -7,7 +7,6 @@
  * - Virtual scrolling for large lists
  * - Debounced state for search inputs
  * - Entity stores with O(1) lookups
- * - Character-by-character font comparison
  * - Persistent localStorage-backed state
  * - Responsive breakpoint tracking
  * - 3D perspective animations
@@ -116,24 +115,6 @@ export {
     type EntityStore,
 } from './createEntityStore/createEntityStore.svelte';
 
-/**
- * Comparison logic
- */
-export {
-    /**
-     * Character-by-character comparison utility
-     */
-    CharacterComparisonEngine,
-    /**
-     * Single line of comparison results
-     */
-    type ComparisonLine,
-    /**
-     * Full comparison output
-     */
-    type ComparisonResult,
-} from './CharacterComparisonEngine/CharacterComparisonEngine.svelte';
-
 /**
  * Text layout
  */
diff --git a/src/shared/lib/index.ts b/src/shared/lib/index.ts
index 42fccfb..81cd249 100644
--- a/src/shared/lib/index.ts
+++ b/src/shared/lib/index.ts
@@ -5,9 +5,6 @@
  */
 
 export {
-    CharacterComparisonEngine,
-    type ComparisonLine,
-    type ComparisonResult,
     type ControlDataModel,
     type ControlModel,
     createDebouncedState,
diff --git a/src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte b/src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte
index a5ae2de..9e3708f 100644
--- a/src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte
+++ b/src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte
@@ -9,6 +9,7 @@
 -->
 <script lang="ts">
 import {
+    CharacterComparisonEngine,
     MULTIPLIER_L,
     MULTIPLIER_M,
     MULTIPLIER_S,
@@ -20,9 +21,6 @@ import {
     debounce,
 } from '$shared/lib';
 import { cn } from '$shared/lib';
-import {
-    CharacterComparisonEngine,
-} from '$shared/lib/helpers/CharacterComparisonEngine/CharacterComparisonEngine.svelte';
 import { Loader } from '$shared/ui';
 import { getContext } from 'svelte';
 import { Spring } from 'svelte/motion';