diff --git a/src/page-components/scheme/Q2Scheme.tsx b/src/page-components/scheme/Q2Scheme.tsx
index f15ac69..fb027d7 100644
--- a/src/page-components/scheme/Q2Scheme.tsx
+++ b/src/page-components/scheme/Q2Scheme.tsx
@@ -6,6 +6,7 @@ import { Q2SchemeStorage } from '../../q-2-scheme';
 import { isNilOrEmpty } from '../../utls';
 import { SchemeExport } from './Export';
 import { Q2SchemeBuilder } from './q-2-scheme/Builder';
+import Q2SchemePreview from './q-2-scheme/Preview';
 
 const tabOptions = [
   { title: 'Overview', id: 'overview' },
@@ -33,6 +34,7 @@ export function Q2Scheme({ scheme }: Q2SchemeProps) {
           export: isNilOrEmpty(scheme.schemeStorage?.cssVariables),
         }}
       />
+      {isEqual(activeTab, 'overview') && <Q2SchemePreview scheme={scheme} />}
       {isEqual(activeTab, 'builder') && (
         <Q2SchemeBuilder scheme={scheme} onBuildCompleted={() => setActiveTab('overview')} />
       )}
diff --git a/src/page-components/scheme/q-2-scheme/Preview.module.css b/src/page-components/scheme/q-2-scheme/Preview.module.css
new file mode 100644
index 0000000..81f9785
--- /dev/null
+++ b/src/page-components/scheme/q-2-scheme/Preview.module.css
@@ -0,0 +1,58 @@
+@layer pages {
+  .preview_layout {
+    padding: var(--spacing-s) var(--spacing-m);
+    width: 100%;
+    display: flex;
+    flex-direction: column;
+    align-items: stretch;
+    gap: var(--spacing-m);
+  }
+  .preview_block {
+    width: inherit;
+    padding: var(--spacing-xl) var(--spacing-m);
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-start;
+    align-items: stretch;
+    gap: var(--spacing-xs);
+    h2 {
+      font-size: var(--font-size-xl);
+      font-weight: bold;
+      line-height: 1.7em;
+    }
+  }
+  .preview_unit {
+    width: inherit;
+    display: grid;
+    grid-template-columns: repeat(5, 1fr);
+    gap: var(--spacing-xs);
+  }
+  .preview_indi_block {
+    width: inherit;
+    display: grid;
+    grid-template-columns: repeat(4, 1fr);
+    gap: var(--spacing-xs);
+  }
+  .preview_swatch {
+    width: inherit;
+    display: grid;
+    grid-template-columns: repeat(16, 1fr);
+    gap: var(--spacing-xs);
+    .preview_swatch_cell {
+      height: 1em;
+    }
+  }
+  .preview_cell {
+    padding: var(--spacing-xs) var(--spacing-s);
+    display: flex;
+    flex-direction: column;
+    align-items: flex-start;
+    gap: var(--spacing-xxs);
+    font-size: var(--font-size-s);
+    line-height: 1.5em;
+    .wacg {
+      font-size: var(--font-size-xxs);
+      line-height: 1em;
+    }
+  }
+}
diff --git a/src/page-components/scheme/q-2-scheme/Preview.tsx b/src/page-components/scheme/q-2-scheme/Preview.tsx
new file mode 100644
index 0000000..c9141a8
--- /dev/null
+++ b/src/page-components/scheme/q-2-scheme/Preview.tsx
@@ -0,0 +1,169 @@
+import { capitalize, keys } from 'lodash-es';
+import { FC, ReactNode, useMemo } from 'react';
+import { useColorFunction } from '../../../ColorFunctionContext';
+import { ScrollArea } from '../../../components/ScrollArea';
+import { SchemeContent } from '../../../models';
+import { Q2Baseline, Q2ColorSet, Q2ColorUnit, Q2SchemeStorage } from '../../../q-2-scheme';
+import styles from './Preview.module.css';
+
+interface PreviewCellProps {
+  bg: string;
+  fg: string;
+  children: ReactNode;
+}
+
+const PreviewCell: FC<PreviewCellProps> = ({ bg, fg, children }) => {
+  const { colorFn } = useColorFunction();
+  const wacgRatio = useMemo(() => {
+    try {
+      if (!colorFn) return null;
+      return colorFn.wacg_relative_contrast(fg, bg);
+    } catch (e) {
+      console.error('[Error on calc WACG Ratio]', e);
+    }
+    return null;
+  }, [bg, fg]);
+
+  return (
+    <div className={styles.preview_cell} style={{ backgroundColor: `#${bg}`, color: `#${fg}` }}>
+      <span>{children}</span>
+      {wacgRatio && <span className={styles.wacg}>WACG {wacgRatio?.toFixed(2)}</span>}
+    </div>
+  );
+};
+
+interface PreviewLineProps {
+  name: string;
+  unit: Q2ColorSet;
+}
+
+const PreviewLine: FC<PreviewLineProps> = ({ name, unit }) => {
+  return (
+    <div className={styles.preview_unit}>
+      <PreviewCell bg={unit.root} fg={unit.onRoot}>
+        {name}
+      </PreviewCell>
+      <PreviewCell bg={unit.hover} fg={unit.onRoot}>
+        {name} Hover
+      </PreviewCell>
+      <PreviewCell bg={unit.active} fg={unit.onRoot}>
+        {name} Active
+      </PreviewCell>
+      <PreviewCell bg={unit.focus} fg={unit.onRoot}>
+        {name} Focus
+      </PreviewCell>
+      <PreviewCell bg={unit.disabled} fg={unit.onDisabled}>
+        {name} Disabled
+      </PreviewCell>
+    </div>
+  );
+};
+
+interface PreviewSwatchLineProps {
+  swatch: Record<string, string>;
+}
+
+const PreviewSwatchLine: FC<PreviewSwatchLineProps> = ({ swatch }) => {
+  const cells = useMemo(() => {
+    const collection: ReactNode[] = [];
+    for (const key of keys(swatch)) {
+      const color = swatch[key];
+      collection.push(
+        <div className={styles.preview_swatch_cell} style={{ backgroundColor: `#${color}` }} />,
+      );
+    }
+    return collection;
+  }, [swatch]);
+
+  return <div className={styles.preview_swatch}>{cells}</div>;
+};
+
+interface PreviewSetProps {
+  name: string;
+  colorUnit: Q2ColorUnit;
+}
+
+const PreviewSet: FC<PreviewSetProps> = ({ name, colorUnit }) => {
+  return (
+    <>
+      <PreviewLine name={name} unit={colorUnit.root} />
+      <PreviewLine name={`${name} Surface`} unit={colorUnit.surface} />
+      <PreviewSwatchLine name={name} swatch={colorUnit.swatch} />
+    </>
+  );
+};
+
+interface PreviewBlockProps {
+  baseline: Q2Baseline;
+  title: string;
+}
+
+const PreviewBlock: FC<PreviewBlockProps> = ({ baseline, title }) => {
+  const customSets = useMemo(() => {
+    const colors = keys(baseline.custom);
+    const elements: ReactNode[] = [];
+
+    for (const key of colors) {
+      const color = baseline.custom[key];
+      elements.push(<PreviewSet name={capitalize(key)} colorUnit={color} />);
+    }
+
+    return elements;
+  }, [baseline.custom]);
+
+  return (
+    <div className={styles.preview_block} style={{ backgroundColor: `#${baseline.surface.root}` }}>
+      <h2 style={{ color: `#${baseline.surface.onRoot}` }}>{title}</h2>
+      <PreviewSet name="Primary" colorUnit={baseline.primary} />
+      <PreviewSet name="Secondary" colorUnit={baseline.secondary} />
+      <PreviewSet name="Tertiary" colorUnit={baseline.tertiary} />
+      <PreviewSet name="Accent" colorUnit={baseline.accent} />
+      <PreviewSet name="Danger" colorUnit={baseline.danger} />
+      <PreviewSet name="Success" colorUnit={baseline.success} />
+      <PreviewSet name="Warn" colorUnit={baseline.warn} />
+      <PreviewSet name="Info" colorUnit={baseline.info} />
+      <PreviewLine name="Neutral" unit={baseline.neutral} />
+      <PreviewLine name="Neutral Variant" unit={baseline.neutralVariant} />
+      <PreviewLine name="Surface" unit={baseline.surface} />
+      <PreviewLine name="Surface Variant" unit={baseline.surfaceVariant} />
+      <div className={styles.preview_indi_block}>
+        <PreviewCell bg={baseline.shadow} fg={baseline.surface.root.onRoot}>
+          Shadow
+        </PreviewCell>
+        <PreviewCell bg={baseline.overlay} fg={baseline.surface.root.onRoot}>
+          Overlay
+        </PreviewCell>
+        <PreviewCell bg={baseline.outline} fg={baseline.surface.root.onRoot}>
+          Outline
+        </PreviewCell>
+        <PreviewCell bg={baseline.outlineVariant} fg={baseline.surface.root.onRoot}>
+          Outline Variant
+        </PreviewCell>
+      </div>
+      {customSets}
+    </div>
+  );
+};
+
+interface PreviewProps {
+  scheme: SchemeContent<Q2SchemeStorage>;
+}
+
+const Q2SchemePreview: FC<PreviewProps> = ({ scheme }) => {
+  return (
+    <ScrollArea enableY>
+      <div className={styles.preview_layout}>
+        <div className={styles.preview_layout}>
+          {scheme.schemeStorage.scheme?.light && (
+            <PreviewBlock baseline={scheme.schemeStorage.scheme.light} title="Light Scheme" />
+          )}
+          {scheme.schemeStorage.scheme?.dark && (
+            <PreviewBlock baseline={scheme.schemeStorage.scheme.dark} title="Dark Scheme" />
+          )}
+        </div>
+      </div>
+    </ScrollArea>
+  );
+};
+
+export default Q2SchemePreview;
diff --git a/src/q-2-scheme.ts b/src/q-2-scheme.ts
index 98f2379..b204d4f 100644
--- a/src/q-2-scheme.ts
+++ b/src/q-2-scheme.ts
@@ -13,7 +13,7 @@ export type Q2ColorSet = {
 export type Q2ColorUnit = {
   root: Q2ColorSet;
   surface: Q2ColorSet;
-  swatch: Map<string, string>;
+  swatch: Record<string, string>;
 };
 
 export type Q2Baseline = {
@@ -33,7 +33,7 @@ export type Q2Baseline = {
   overlay: string;
   outline: string;
   outlineVariant: string;
-  custom: Map<string, Q2ColorUnit>;
+  custom: Record<string, Q2ColorUnit>;
 };
 
 export type Q2Scheme = {