diff --git a/src/alf/atoms.ts b/src/alf/atoms.ts
index 2625beda27..ca4c14dc6d 100644
--- a/src/alf/atoms.ts
+++ b/src/alf/atoms.ts
@@ -276,13 +276,13 @@ export const atoms = {
     letterSpacing: tokens.TRACKING,
   },
   font_normal: {
-    fontWeight: tokens.fontWeight.regular,
+    fontWeight: tokens.fontWeight.normal,
   },
   font_bold: {
-    fontWeight: tokens.fontWeight.semibold,
+    fontWeight: tokens.fontWeight.bold,
   },
   font_heavy: {
-    fontWeight: tokens.fontWeight.extrabold,
+    fontWeight: tokens.fontWeight.heavy,
   },
   italic: {
     fontStyle: 'italic',
diff --git a/src/alf/tokens.ts b/src/alf/tokens.ts
index f3ac17e6af..9ea585ee7c 100644
--- a/src/alf/tokens.ts
+++ b/src/alf/tokens.ts
@@ -1,6 +1,6 @@
-import {Platform} from 'react-native'
+import {isAndroid} from '#/platform/detection'
 
-export const TRACKING = Platform.OS === 'android' ? 0.1 : 0
+export const TRACKING = isAndroid ? 0.1 : 0
 
 export const color = {
   temp_purple: 'rgb(105 0 255)',
@@ -51,12 +51,9 @@ export const borderRadius = {
  * These correspond to Inter font files we actually load.
  */
 export const fontWeight = {
-  regular: '400',
-  // medium: '500',
-  semibold: '600',
-  // bold: '700',
-  extrabold: '800',
-  // black: '900',
+  normal: '400',
+  bold: isAndroid ? '700' : '600',
+  heavy: isAndroid ? '900' : '800',
 } as const
 
 export const gradients = {
diff --git a/src/lib/themes.ts b/src/lib/themes.ts
index eb11872fa3..2aeec31398 100644
--- a/src/lib/themes.ts
+++ b/src/lib/themes.ts
@@ -2,6 +2,7 @@ import {Platform} from 'react-native'
 
 import {tokens} from '#/alf'
 import {darkPalette, dimPalette, lightPalette} from '#/alf/themes'
+import {fontWeight} from '#/alf/tokens'
 import {colors} from './styles'
 import type {Theme} from './ThemeContext'
 
@@ -90,195 +91,195 @@ export const defaultTheme: Theme = {
     '2xl-thin': {
       fontSize: 18,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     '2xl': {
       fontSize: 18,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     '2xl-medium': {
       fontSize: 18,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     '2xl-bold': {
       fontSize: 18,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     '2xl-heavy': {
       fontSize: 18,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '800',
+      fontWeight: fontWeight.heavy,
     },
     'xl-thin': {
       fontSize: 17,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     xl: {
       fontSize: 17,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'xl-medium': {
       fontSize: 17,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'xl-bold': {
       fontSize: 17,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'xl-heavy': {
       fontSize: 17,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '800',
+      fontWeight: fontWeight.heavy,
     },
     'lg-thin': {
       fontSize: 16,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     lg: {
       fontSize: 16,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'lg-medium': {
       fontSize: 16,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'lg-bold': {
       fontSize: 16,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'lg-heavy': {
       fontSize: 16,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '800',
+      fontWeight: fontWeight.heavy,
     },
     'md-thin': {
       fontSize: 15,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     md: {
       fontSize: 15,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'md-medium': {
       fontSize: 15,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'md-bold': {
       fontSize: 15,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'md-heavy': {
       fontSize: 15,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '800',
+      fontWeight: fontWeight.heavy,
     },
     'sm-thin': {
       fontSize: 14,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     sm: {
       fontSize: 14,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'sm-medium': {
       fontSize: 14,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'sm-bold': {
       fontSize: 14,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'sm-heavy': {
       fontSize: 14,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '800',
+      fontWeight: fontWeight.heavy,
     },
     'xs-thin': {
       fontSize: 13,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     xs: {
       fontSize: 13,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'xs-medium': {
       fontSize: 13,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'xs-bold': {
       fontSize: 13,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'xs-heavy': {
       fontSize: 13,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '800',
+      fontWeight: fontWeight.heavy,
     },
 
     'title-2xl': {
       fontSize: 34,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'title-xl': {
       fontSize: 28,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     'title-lg': {
       fontSize: 22,
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
     },
     title: {
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
       fontSize: 20,
       letterSpacing: tokens.TRACKING,
     },
     'title-sm': {
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
       fontSize: 17,
       letterSpacing: tokens.TRACKING,
     },
     'post-text': {
       fontSize: 16,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'post-text-lg': {
       fontSize: 20,
       letterSpacing: tokens.TRACKING,
-      fontWeight: '400',
+      fontWeight: fontWeight.normal,
     },
     'button-lg': {
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
       fontSize: 18,
       letterSpacing: tokens.TRACKING,
     },
     button: {
-      fontWeight: '600',
+      fontWeight: fontWeight.bold,
       fontSize: 14,
       letterSpacing: tokens.TRACKING,
     },