diff --git a/apps/mobile-rn/__tests__/devices.test.ts b/apps/mobile-rn/__tests__/devices.test.ts
index f7e45a4..dccf1a6 100644
--- a/apps/mobile-rn/__tests__/devices.test.ts
+++ b/apps/mobile-rn/__tests__/devices.test.ts
@@ -27,6 +27,12 @@ describe('device response contract', () => {
     })
   })
 
+  it('accepts desktop and web devices registered to the same account', () => {
+    for (const platform of ['windows', 'macos', 'web', 'ios'] as const) {
+      expect(normalizeRegisteredDevice({ ...row, platform }).platform).toBe(platform)
+    }
+  })
+
   it('rejects missing timestamps and unsupported platforms', () => {
     expect(() => normalizeRegisteredDevice({ ...row, last_seen_at: 'bad' }))
       .toThrow(DeviceServiceError)
diff --git a/apps/mobile-rn/src/features/devices/device-service.ts b/apps/mobile-rn/src/features/devices/device-service.ts
index 597c400..b05d8fa 100644
--- a/apps/mobile-rn/src/features/devices/device-service.ts
+++ b/apps/mobile-rn/src/features/devices/device-service.ts
@@ -1,11 +1,19 @@
 import type { MobileRuntimeConfig } from '../../lib/native-config'
 import { supabase } from '../../lib/supabase'
 
+/** 서버 devices.platform CHECK 목록과 같다. 데스크톱(windows/macos)도 같은 계정의 기기로 등록된다. */
+export const DEVICE_PLATFORMS = ['android', 'ios', 'web', 'windows', 'macos'] as const
+export type DevicePlatform = (typeof DEVICE_PLATFORMS)[number]
+
+function isDevicePlatform(value: unknown): value is DevicePlatform {
+  return typeof value === 'string' && (DEVICE_PLATFORMS as readonly string[]).includes(value)
+}
+
 export interface RegisteredDevice {
   id: string
   userId: string
   installationId: string
-  platform: 'android' | 'ios'
+  platform: DevicePlatform
   deviceName: string
   appVersion: string
   osVersion: string | null
@@ -43,7 +51,7 @@ export function normalizeRegisteredDevice(value: unknown): RegisteredDevice {
     typeof value.id !== 'string'
     || typeof value.user_id !== 'string'
     || typeof value.installation_id !== 'string'
-    || (value.platform !== 'android' && value.platform !== 'ios')
+    || !isDevicePlatform(value.platform)
     || typeof value.device_name !== 'string'
     || typeof value.app_version !== 'string'
     || (value.os_version !== null && typeof value.os_version !== 'string')
diff --git a/apps/mobile-rn/src/screens/DevicesScreen.tsx b/apps/mobile-rn/src/screens/DevicesScreen.tsx
index b370548..d372d17 100644
--- a/apps/mobile-rn/src/screens/DevicesScreen.tsx
+++ b/apps/mobile-rn/src/screens/DevicesScreen.tsx
@@ -150,7 +150,10 @@ export default function DevicesScreen(): React.ReactElement {
                     : t('mobile.devices.active')}
               </ThemeText>
             </View>
-            <ThemeText variant="small" color="muted">{device.osVersion ?? '—'}</ThemeText>
+            <ThemeText variant="small" color="muted">
+              {t(`mobile.devices.platform.${device.platform}`)}
+              {device.osVersion ? ` · ${device.osVersion}` : ''}
+            </ThemeText>
             <ThemeText variant="small" color="muted">
               {t('mobile.devices.version', { version: device.appVersion })}
             </ThemeText>