diff --git a/src/app/subscription/subscription-screen.helpers.ts b/src/app/subscription/subscription-screen.helpers.ts
new file mode 100644
index 00000000..2a520a0d
--- /dev/null
+++ b/src/app/subscription/subscription-screen.helpers.ts
@@ -0,0 +1,80 @@
+import type { PaymentPlan } from "@/data/dto/payment";
+
+import type { SubscriptionPlanView } from "./components/subscription-plan-card";
+
+export type SubscriptionType = "vip" | "voice";
+
+export const SUBSCRIPTION_BANNER_TITLES: Record<SubscriptionType, string> = {
+  vip: "Subscribe to become the VIP Member",
+  voice: "Buy Voice Message Package",
+};
+
+function isVipPlan(plan: PaymentPlan): boolean {
+  return plan.orderType.startsWith("vip_") || plan.planId.startsWith("vip_");
+}
+
+function isVoicePackagePlan(plan: PaymentPlan): boolean {
+  const orderType = plan.orderType.toLowerCase();
+  const planId = plan.planId.toLowerCase();
+  return (
+    plan.dolAmount !== null ||
+    orderType.startsWith("dol_") ||
+    planId.startsWith("dol_") ||
+    orderType.includes("voice") ||
+    planId.includes("voice")
+  );
+}
+
+export function isPlanForType(
+  plan: PaymentPlan,
+  subscriptionType: SubscriptionType,
+): boolean {
+  return subscriptionType === "voice"
+    ? isVoicePackagePlan(plan)
+    : isVipPlan(plan);
+}
+
+function currencySymbol(currency: string): string {
+  if (currency === "CNY") return "¥";
+  if (currency === "USD") return "$";
+  return `${currency} `;
+}
+
+function formatAmount(amountCents: number | null): string | null {
+  if (amountCents === null) return null;
+  return (amountCents / 100).toFixed(2).replace(/\.00$/, "");
+}
+
+function planCaption(
+  plan: PaymentPlan,
+  subscriptionType: SubscriptionType,
+): string {
+  if (subscriptionType === "voice") {
+    return plan.dolAmount === null
+      ? "Voice package"
+      : `${plan.dolAmount} voice messages`;
+  }
+  if (plan.dailyPriceCents !== null) {
+    const dailyPrice = formatAmount(plan.dailyPriceCents);
+    return dailyPrice === null
+      ? "Lifetime"
+      : `${currencySymbol(plan.currency)}${dailyPrice}/day`;
+  }
+  if (plan.vipDays === null) return "Lifetime";
+  const fallbackDailyPrice = plan.amountCents / Math.max(plan.vipDays, 1);
+  return `${currencySymbol(plan.currency)}${formatAmount(fallbackDailyPrice)}/day`;
+}
+
+export function toPlanView(
+  plan: PaymentPlan,
+  subscriptionType: SubscriptionType,
+): SubscriptionPlanView {
+  return {
+    id: plan.planId,
+    name: plan.planName,
+    price: formatAmount(plan.amountCents) ?? "",
+    originalPrice: formatAmount(plan.originalAmountCents),
+    perDay: planCaption(plan, subscriptionType),
+    currencySymbol: currencySymbol(plan.currency),
+  };
+}
diff --git a/src/app/subscription/subscription-screen.tsx b/src/app/subscription/subscription-screen.tsx
index ba2179f4..471a71f0 100644
--- a/src/app/subscription/subscription-screen.tsx
+++ b/src/app/subscription/subscription-screen.tsx
@@ -18,7 +18,6 @@ import { useEffect, useMemo, useRef } from "react";
 
 import { Checkbox, MobileShell } from "@/app/_components/core";
 import { AppConstants } from "@/core/app_constants";
-import type { PaymentPlan } from "@/data/dto/payment";
 import { VIP_BENEFITS } from "@/data/constants/vip-benefits";
 import { PendingPaymentOrderStorage } from "@/data/storage";
 import {
@@ -37,85 +36,15 @@ import {
   SubscriptionUserRow,
 } from "./components";
 import styles from "./components/subscription-screen.module.css";
-import type { SubscriptionPlanView } from "./components/subscription-plan-card";
+import {
+  SUBSCRIPTION_BANNER_TITLES,
+  isPlanForType,
+  toPlanView,
+  type SubscriptionType,
+} from "./subscription-screen.helpers";
 
 const FALLBACK_USERNAME = "User name";
-export type SubscriptionType = "vip" | "voice";
-
-const SUBSCRIPTION_BANNER_TITLES: Record<SubscriptionType, string> = {
-  vip: "Subscribe to become the VIP Member",
-  voice: "Buy Voice Message Package",
-};
-
-function isVipPlan(plan: PaymentPlan): boolean {
-  return plan.orderType.startsWith("vip_") || plan.planId.startsWith("vip_");
-}
-
-function isVoicePackagePlan(plan: PaymentPlan): boolean {
-  const orderType = plan.orderType.toLowerCase();
-  const planId = plan.planId.toLowerCase();
-  return (
-    plan.dolAmount !== null ||
-    orderType.startsWith("dol_") ||
-    planId.startsWith("dol_") ||
-    orderType.includes("voice") ||
-    planId.includes("voice")
-  );
-}
-
-function isPlanForType(
-  plan: PaymentPlan,
-  subscriptionType: SubscriptionType,
-): boolean {
-  return subscriptionType === "voice"
-    ? isVoicePackagePlan(plan)
-    : isVipPlan(plan);
-}
-
-function currencySymbol(currency: string): string {
-  if (currency === "CNY") return "¥";
-  if (currency === "USD") return "$";
-  return `${currency} `;
-}
-
-function formatAmount(amountCents: number | null): string | null {
-  if (amountCents === null) return null;
-  return (amountCents / 100).toFixed(2).replace(/\.00$/, "");
-}
-
-function planCaption(
-  plan: PaymentPlan,
-  subscriptionType: SubscriptionType,
-): string {
-  if (subscriptionType === "voice") {
-    return plan.dolAmount === null
-      ? "Voice package"
-      : `${plan.dolAmount} voice messages`;
-  }
-  if (plan.dailyPriceCents !== null) {
-    const dailyPrice = formatAmount(plan.dailyPriceCents);
-    return dailyPrice === null
-      ? "Lifetime"
-      : `${currencySymbol(plan.currency)}${dailyPrice}/day`;
-  }
-  if (plan.vipDays === null) return "Lifetime";
-  const fallbackDailyPrice = plan.amountCents / Math.max(plan.vipDays, 1);
-  return `${currencySymbol(plan.currency)}${formatAmount(fallbackDailyPrice)}/day`;
-}
-
-function toPlanView(
-  plan: PaymentPlan,
-  subscriptionType: SubscriptionType,
-): SubscriptionPlanView {
-  return {
-    id: plan.planId,
-    name: plan.planName,
-    price: formatAmount(plan.amountCents) ?? "",
-    originalPrice: formatAmount(plan.originalAmountCents),
-    perDay: planCaption(plan, subscriptionType),
-    currencySymbol: currencySymbol(plan.currency),
-  };
-}
+export type { SubscriptionType } from "./subscription-screen.helpers";
 
 export interface SubscriptionScreenProps {
   subscriptionType?: SubscriptionType;