diff --git a/.github/workflows/landing.yml b/.github/workflows/landing.yml
index be351ca..1d4ad9f 100644
--- a/.github/workflows/landing.yml
+++ b/.github/workflows/landing.yml
@@ -3,9 +3,9 @@ name: landing
 on:
   push:
     branches: [main]
-    paths: ["landing/**", ".github/workflows/landing.yml"]
+    paths: ["landing/**", "shared/**", ".github/workflows/landing.yml"]
   pull_request:
-    paths: ["landing/**", ".github/workflows/landing.yml"]
+    paths: ["landing/**", "shared/**", ".github/workflows/landing.yml"]
 
 jobs:
   check:
@@ -26,3 +26,4 @@ jobs:
       - run: pnpm install --frozen-lockfile
       - run: pnpm lint
       - run: pnpm test
+      - run: pnpm exec tsc --noEmit
diff --git a/.github/workflows/portal.yml b/.github/workflows/portal.yml
new file mode 100644
index 0000000..e59b2aa
--- /dev/null
+++ b/.github/workflows/portal.yml
@@ -0,0 +1,27 @@
+name: portal
+
+on:
+  push:
+    branches: [main]
+    paths: ["portal/**", "shared/**", ".github/workflows/portal.yml"]
+  pull_request:
+    paths: ["portal/**", "shared/**", ".github/workflows/portal.yml"]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: portal
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 11
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: portal/pnpm-lock.yaml
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm exec tsc --noEmit
diff --git a/landing/app/components/Pricing.tsx b/landing/app/components/Pricing.tsx
index e1680db..03a6e2b 100644
--- a/landing/app/components/Pricing.tsx
+++ b/landing/app/components/Pricing.tsx
@@ -2,91 +2,24 @@
 
 import { useFadeIn } from "../hooks/useFadeIn";
 
-const plans = [
-  {
-    name: "Free",
-    price: "$0",
-    period: "forever",
-    desc: "Everything you need, no account required.",
-    highlight: false,
-    cta: "Download",
-    ctaHref: "#download",
-    features: [
-      "All core SSH features",
-      "SFTP with drag & drop",
-      "Docker & serial console",
-      "Gist E2EE sync (free)",
-      "Plugin system",
-      "Custom themes",
-      "Local terminal",
-      "Persistent sessions & workspace restore",
-      "Port forwarding",
-      "Audit logs",
-      "Snippets & command palette",
-      "Import / Export (no lock-in)",
-    ],
-  },
-  {
-    name: "Pro",
-    price: "$7",
-    period: "/ month",
-    billingNote: "billed annually",
-    monthlyOption: "or $9 billed monthly",
-    savings: "Save 22% with annual billing",
-    desc: "Real-time sync and unlimited vaults for power users.",
-    highlight: true,
-    trial: "14-day free trial",
-    cta: "Start free trial",
-    ctaHref: "https://app.voltius.app/signup?plan=pro",
-    features: [
-      "Everything in Free",
-      "Real-time cloud sync (CRDTs)",
-      "Sub-second updates via SSE",
-      "Cross-device sessions — one live terminal, shared on all your devices",
-      "Unlimited private vaults",
-      "Real-time collaboration — 1 session · 1 participant",
-    ],
-  },
-  {
-    name: "Teams",
-    price: "$15",
-    period: "/ user / month",
-    billingNote: "billed annually",
-    monthlyOption: "or $18 billed monthly",
-    savings: "Save 17% with annual billing",
-    desc: "Shared vaults, live terminals, and access control for teams (3-user minimum).",
-    highlight: false,
-    cta: "Get Teams",
-    ctaHref: "https://app.voltius.app/signup?plan=teams",
-    features: [
-      "Everything in Pro",
-      "Team vaults & invites",
-      "Real-time collaboration — 5 sessions · 10 participants each",
-      "Built-in roles (Owner, Manager, Editor, Member)",
-      "Team audit logs",
-    ],
-  },
-  {
-    name: "Business",
-    price: "$25",
-    period: "/ user / month",
-    billingNote: "billed annually",
-    monthlyOption: "or $30 billed monthly",
-    savings: "Save 17% with annual billing",
-    desc: "Commercial license, advanced collaboration, and dedicated support for organizations (3-user minimum).",
-    highlight: false,
-    cta: "Get Business",
-    ctaHref: "https://app.voltius.app/signup?plan=business",
-    features: [
-      "Everything in Teams",
-      "Real-time collaboration — 20 sessions · 50 participants each",
-      "Custom roles & granular permissions",
-      "Commercial license",
-      "Priority support",
-      "Custom contracts",
-    ],
-  },
-];
+import { PLANS, priceLabel, trialLabel, trialCardLabel, type PlanId } from "@shared/plans";
+
+/** Presentation that belongs to this page only: which card is featured and where its button goes. */
+const PRESENTATION: Record<PlanId, { highlight: boolean; cta: string; ctaHref: string }> = {
+  free: { highlight: false, cta: "Download", ctaHref: "#download" },
+  pro: { highlight: true, cta: "Start free trial", ctaHref: "https://app.voltius.app/signup?plan=pro" },
+  teams: { highlight: false, cta: "Get Teams", ctaHref: "https://app.voltius.app/signup?plan=teams" },
+  business: { highlight: false, cta: "Get Business", ctaHref: "https://app.voltius.app/signup?plan=business" },
+};
+
+const plans = PLANS.map((plan) => ({
+  ...plan,
+  ...PRESENTATION[plan.id],
+  price: priceLabel(plan.annualPrice),
+  billingNote: plan.annualPrice > 0 ? "billed annually" : null,
+  monthlyOption: plan.monthlyPrice > 0 ? `or ${priceLabel(plan.monthlyPrice)} billed monthly` : null,
+  trialNote: plan.trial ? `${trialLabel(plan.trial)} • ${trialCardLabel(plan.trial)}` : null,
+}));
 
 function PricingCard({ plan, index }: { plan: (typeof plans)[0]; index: number }) {
   const ref = useFadeIn(index * 80);
@@ -111,13 +44,13 @@ function PricingCard({ plan, index }: { plan: (typeof plans)[0]; index: number }
           <span className="text-3xl font-bold text-white">{plan.price}</span>
           {plan.period && <span className="text-sm text-zinc-500">{plan.period}</span>}
         </div>
-        {"billingNote" in plan && plan.billingNote && (
+        {plan.billingNote && (
           <p className="mt-1 text-xs text-zinc-500">{plan.billingNote}</p>
         )}
-        {"monthlyOption" in plan && plan.monthlyOption && (
+        {plan.monthlyOption && (
           <p className="mt-1 text-xs text-zinc-500">{plan.monthlyOption}</p>
         )}
-        {"savings" in plan && plan.savings && (
+        {plan.savings && (
           <p className="mt-1 text-xs font-medium text-cyan-400">{plan.savings}</p>
         )}
         <p className="mt-2 text-xs text-zinc-500 leading-relaxed">{plan.desc}</p>
@@ -133,10 +66,8 @@ function PricingCard({ plan, index }: { plan: (typeof plans)[0]; index: number }
       >
         {plan.cta}
       </a>
-      {"trial" in plan && (
-        <p className="-mt-3 text-center text-xs text-zinc-500">
-          {plan.trial as string} • {"trialNote" in plan ? plan.trialNote as string : "no credit card required"}
-        </p>
+      {plan.trialNote && (
+        <p className="-mt-3 text-center text-xs text-zinc-500">{plan.trialNote}</p>
       )}
 
       <ul className="flex flex-col gap-2">
diff --git a/landing/app/plans.test.ts b/landing/app/plans.test.ts
new file mode 100644
index 0000000..fc15b57
--- /dev/null
+++ b/landing/app/plans.test.ts
@@ -0,0 +1,46 @@
+import { test, expect } from "vitest";
+import { PLANS, PER_SEAT_PLAN_IDS, MIN_SEATS, planOrder, planById } from "@shared/plans";
+
+test("every plan the site sells has both prices and an order", () => {
+  for (const plan of PLANS) {
+    expect(plan.name).toBeTruthy();
+    expect(plan.annualPrice).toBeGreaterThanOrEqual(0);
+    expect(plan.monthlyPrice).toBeGreaterThanOrEqual(plan.annualPrice);
+    expect(planOrder(plan.id)).toBeGreaterThanOrEqual(0);
+  }
+});
+
+test("annual never costs more than monthly", () => {
+  // The site advertises annual as the saving; a paid plan priced the other way
+  // round would contradict its own savings label.
+  for (const plan of PLANS.filter((p) => p.annualPrice > 0)) {
+    expect(plan.annualPrice).toBeLessThan(plan.monthlyPrice);
+    expect(plan.savings).toBeTruthy();
+  }
+});
+
+test("per-seat plans are exactly Teams and Business", () => {
+  // Mirrors PER_SEAT_PLANS in the server's billing handler.
+  expect([...PER_SEAT_PLAN_IDS].sort()).toEqual(["business", "teams"]);
+});
+
+test("Business never undercuts Teams at the shared seat floor", () => {
+  const teams = planById("teams")!;
+  const business = planById("business")!;
+  for (const period of ["annualPrice", "monthlyPrice"] as const) {
+    expect(business[period] * MIN_SEATS).toBeGreaterThan(teams[period] * MIN_SEATS);
+  }
+});
+
+test("only the Pro trial is free of a credit card", () => {
+  // Pro's trial is granted server-side at registration; every other trial runs
+  // through LemonSqueezy, which takes a card.
+  for (const plan of PLANS.filter((p) => p.trial)) {
+    expect(plan.trial!.creditCardRequired).toBe(plan.id !== "pro");
+  }
+});
+
+test("Business is sold without a trial", () => {
+  // A free trial of a commercial licence would grant AGPL relief for nothing.
+  expect(planById("business")!.trial).toBeNull();
+});
diff --git a/landing/app/terms/page.tsx b/landing/app/terms/page.tsx
index 536ba6b..b81664b 100644
--- a/landing/app/terms/page.tsx
+++ b/landing/app/terms/page.tsx
@@ -1,10 +1,19 @@
 import Link from "next/link";
 import type { Metadata } from "next";
+import { PLANS, MIN_SEATS, priceLabel, trialLabel, trialCardLabel, type Plan } from "@shared/plans";
 
 export const metadata: Metadata = {
   title: "Terms of Service — Voltius",
 };
 
+/** Renders the billing terms for one plan from the catalogue, so prices are stated once. */
+function planPriceSentence(plan: Plan): string {
+  if (plan.annualPrice === 0) return "$0, no account required.";
+  const rate = plan.perSeat ? "/user/month" : "/month";
+  const seats = plan.perSeat ? `, billed per seat with a ${MIN_SEATS}-user minimum` : "";
+  return `${priceLabel(plan.annualPrice)}${rate} (billed annually) or ${priceLabel(plan.monthlyPrice)}${rate} (billed monthly)${seats}.`;
+}
+
 const EFFECTIVE_DATE = "April 23, 2026";
 const CONTACT_EMAIL = "contact@voltius.app";
 
@@ -56,23 +65,13 @@ export default function TermsPage() {
               date. No refunds are issued for partial periods, except as required by applicable law.
             </p>
             <ul className="list-disc pl-6 mt-3 space-y-1 text-sm">
-              <li>
-                <strong className="text-white">Free</strong> — $0, no account required.
-              </li>
-              <li>
-                <strong className="text-white">Pro</strong> — $7/month (billed annually) or
-                $9/month (billed monthly). Includes a 14-day free trial, no credit card required.
-              </li>
-              <li>
-                <strong className="text-white">Teams</strong> — $15/user/month (billed annually) or
-                $18/user/month (billed monthly), billed per seat with a 3-user minimum. Includes a
-                14-day free trial, credit card required.
-              </li>
-              <li>
-                <strong className="text-white">Business</strong> — $25/user/month (billed annually)
-                or $30/user/month (billed monthly), billed per seat with a 3-user minimum.
-                Contact us for custom contracts and self-hosted deployment.
-              </li>
+              {PLANS.map((plan) => (
+                <li key={plan.id}>
+                  <strong className="text-white">{plan.name}</strong> — {planPriceSentence(plan)}
+                  {plan.trial && ` Includes a ${trialLabel(plan.trial)}, ${trialCardLabel(plan.trial)}.`}
+                  {plan.id === "business" && " Contact us for custom contracts and self-hosted deployment."}
+                </li>
+              ))}
             </ul>
           </Section>
 
diff --git a/landing/next.config.ts b/landing/next.config.ts
index 094ffc9..a0c8216 100644
--- a/landing/next.config.ts
+++ b/landing/next.config.ts
@@ -1,6 +1,14 @@
 import type { NextConfig } from "next";
+import path from "node:path";
 
 const nextConfig: NextConfig = {
+  // The plan catalogue lives above this app so both web apps share one copy.
+  // Turbopack needs the workspace root widened and the alias spelled out;
+  // tsconfig paths alone resolve for tsc but not for the bundler.
+  turbopack: {
+    root: path.join(__dirname, ".."),
+    resolveAlias: { "@shared": path.join(__dirname, "..", "shared") },
+  },
   async redirects() {
     return [
       // The in-app updater and the README send users to /download; the download
diff --git a/landing/tsconfig.json b/landing/tsconfig.json
index 7d1f9d1..858102c 100644
--- a/landing/tsconfig.json
+++ b/landing/tsconfig.json
@@ -19,11 +19,13 @@
       }
     ],
     "paths": {
-      "@/*": ["./*"]
+      "@/*": ["./*"],
+      "@shared/*": ["../shared/*"]
     }
   },
   "include": [
     "next-env.d.ts",
+    "../shared/**/*.ts",
     "**/*.ts",
     "**/*.tsx",
     ".next/types/**/*.ts",
diff --git a/landing/vitest.config.mts b/landing/vitest.config.mts
index 4215f3b..db7325f 100644
--- a/landing/vitest.config.mts
+++ b/landing/vitest.config.mts
@@ -1,6 +1,15 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
 import { defineConfig } from "vitest/config";
 
+const here = path.dirname(fileURLToPath(import.meta.url));
+
 export default defineConfig({
+  // Matches the Turbopack alias in next.config.ts; vitest does not read
+  // tsconfig paths on its own.
+  resolve: {
+    alias: { "@shared": path.join(here, "..", "shared") },
+  },
   test: {
     environment: "node",
     include: ["app/**/*.test.ts"],
diff --git a/portal/app/account/page.tsx b/portal/app/account/page.tsx
index 18fa556..0e22b7a 100644
--- a/portal/app/account/page.tsx
+++ b/portal/app/account/page.tsx
@@ -2,6 +2,7 @@
 
 import { useState, useEffect } from "react";
 import { useRouter } from "next/navigation";
+import { PLANS, PER_SEAT_PLAN_IDS, MIN_SEATS, planOrder, trialLabel } from "@shared/plans";
 import Image from "next/image";
 import { getCheckoutUrl, getPortalUrl, updateSeats, refreshJwt, getSubscription, cancelSubscription, resumeSubscription, resendVerificationEmail } from "../../lib/api";
 import EditEmailModal from "./EditEmailModal";
@@ -19,96 +20,11 @@ const PLAN_LABELS: Record<string, string> = {
   pro_trial: "Pro (Trial)",
 };
 
-const PLAN_ORDER: Record<string, number> = { free: 0, pro: 1, teams: 2, business: 3 };
-
-// Billed on quantity by the server, which floors both at 3 seats.
-const PER_SEAT_PLAN_IDS = ["teams", "business"];
-const MIN_SEATS = 3;
-
-const allPlans = [
-  {
-    id: "free",
-    name: "Free",
-    annualPrice: 0,
-    monthlyPrice: 0,
-    period: "forever",
-    desc: "Everything you need, no account required.",
-    trial: null as string | null,
-    noCreditCard: false,
-    comingSoon: false,
-    features: [
-      "All core SSH features",
-      "SFTP with drag & drop",
-      "Docker & serial console",
-      "Gist E2EE sync (free)",
-      "Plugin system",
-      "Custom themes",
-      "Local terminal",
-      "Port forwarding",
-      "Audit logs",
-      "Snippets & command palette",
-      "Import / Export (no lock-in)",
-    ],
-  },
-  {
-    id: "pro",
-    name: "Pro",
-    annualPrice: 7,
-    monthlyPrice: 9,
-    period: "/ month",
-    savings: "Save 22% with annual billing",
-    desc: "Real-time sync and unlimited vaults for power users.",
-    trial: "14-day free trial" as string | null,
-    noCreditCard: true,
-    comingSoon: false,
-    features: [
-      "Everything in Free",
-      "Real-time cloud sync (CRDTs)",
-      "Sub-second updates via SSE",
-      "Unlimited private vaults",
-      "Real-time collaboration — 1 session · 1 participant",
-    ],
-  },
-  {
-    id: "teams",
-    name: "Teams",
-    annualPrice: 15,
-    monthlyPrice: 18,
-    period: "/ user / month",
-    savings: "Save 17% with annual billing",
-    desc: "Shared vaults, live terminals, and access control for teams (3-user minimum).",
-    trial: "14-day free trial" as string | null,
-    noCreditCard: false,
-    comingSoon: false,
-    features: [
-      "Everything in Pro",
-      "Team vaults & invites",
-      "Real-time collaboration — 5 sessions · 10 participants each",
-      "Built-in roles (Owner, Manager, Editor, Member)",
-      "Team audit logs",
-    ],
-  },
-  {
-    id: "business",
-    name: "Business",
-    annualPrice: 25,
-    monthlyPrice: 30,
-    period: "/ user / month",
-    savings: "Save 17% with annual billing" as string | null,
-    desc: "Commercial license, advanced collaboration, and dedicated support for organizations (3-user minimum).",
-    trial: null as string | null,
-    noCreditCard: false,
-    comingSoon: false,
-    features: [
-      "Everything in Teams",
-      "Real-time collaboration — 20 sessions · 50 participants each",
-      "Custom roles & granular permissions",
-      "Commercial license exception",
-      "Priority SLA support",
-      "Custom contracts",
-    ],
-  },
-];
+const allPlans = PLANS.map((plan) => ({
+  ...plan,
+  trial: plan.trial ? trialLabel(plan.trial) : null,
+  noCreditCard: plan.trial ? !plan.trial.creditCardRequired : false,
+}));
 
 export default function AccountPage() {
   const router = useRouter();
@@ -648,10 +564,9 @@ function PlanCard({
     : billingPeriod === "annual" ? "billed annually"
     : "billed monthly";
 
-  const currentOrder = PLAN_ORDER[activePlanId] ?? 0;
-  const planOrder = PLAN_ORDER[plan.id] ?? 0;
+  const currentOrder = planOrder(activePlanId);
   const isActive = plan.id === activePlanId;
-  const isUpgrade = planOrder > currentOrder;
+  const isUpgrade = planOrder(plan.id) > currentOrder;
 
   const loading = checkoutLoading || portalLoading;
   const renewalDate = formatBillingDate(renewsAt);
@@ -764,13 +679,7 @@ function PlanCard({
       )}
 
       {/* CTA */}
-      {plan.comingSoon ? (
-        <div
-          className="w-full py-2.5 rounded-xl text-sm font-semibold text-center border border-[#1e1e2e] text-zinc-600 cursor-default select-none"
-        >
-          Coming soon
-        </div>
-      ) : isActive ? (
+      {isActive ? (
         <div className="flex flex-col gap-2">
           {onTrial && plan.id === "pro" ? (
             <>
diff --git a/portal/next.config.ts b/portal/next.config.ts
index 20e8ca0..0d3eb1d 100644
--- a/portal/next.config.ts
+++ b/portal/next.config.ts
@@ -1,8 +1,13 @@
 import type { NextConfig } from "next";
+import path from "node:path";
 
 const nextConfig: NextConfig = {
   transpilePackages: ["@voltius/crypto-wasm"],
-  turbopack: {},
+  // See landing/next.config.ts: the shared plan catalogue sits outside this app.
+  turbopack: {
+    root: path.join(__dirname, ".."),
+    resolveAlias: { "@shared": path.join(__dirname, "..", "shared") },
+  },
   webpack(config) {
     config.experiments = { ...config.experiments, asyncWebAssembly: true };
     return config;
diff --git a/portal/pnpm-workspace.yaml b/portal/pnpm-workspace.yaml
index a2a1883..dd1b4fd 100644
--- a/portal/pnpm-workspace.yaml
+++ b/portal/pnpm-workspace.yaml
@@ -1,3 +1,3 @@
 allowBuilds:
-  sharp: set this to true or false
-  unrs-resolver: set this to true or false
+  sharp: true
+  unrs-resolver: true
diff --git a/portal/tsconfig.json b/portal/tsconfig.json
index e7ff3a2..ca3792a 100644
--- a/portal/tsconfig.json
+++ b/portal/tsconfig.json
@@ -25,11 +25,15 @@
     "paths": {
       "@/*": [
         "./*"
+      ],
+      "@shared/*": [
+        "../shared/*"
       ]
     }
   },
   "include": [
     "next-env.d.ts",
+    "../shared/**/*.ts",
     "**/*.ts",
     "**/*.tsx",
     ".next/types/**/*.ts",
diff --git a/shared/plans.ts b/shared/plans.ts
new file mode 100644
index 0000000..c7278cc
--- /dev/null
+++ b/shared/plans.ts
@@ -0,0 +1,143 @@
+/**
+ * The plan catalogue both web apps render from.
+ *
+ * Prices are per seat per month in USD; annual plans bill twelve times the
+ * annual rate. The server owns enforcement — seat floors and LemonSqueezy
+ * variant ids — so nothing here is authoritative for billing, only for display.
+ */
+
+export type PlanId = "free" | "pro" | "teams" | "business";
+
+export interface PlanTrial {
+  days: number;
+  /** LemonSqueezy trials take a card; the Pro trial is granted at registration and does not. */
+  creditCardRequired: boolean;
+}
+
+export interface Plan {
+  id: PlanId;
+  name: string;
+  annualPrice: number;
+  monthlyPrice: number;
+  period: string;
+  savings: string | null;
+  desc: string;
+  trial: PlanTrial | null;
+  perSeat: boolean;
+  features: string[];
+}
+
+/** Mirrors MIN_SEATS in the server's billing handler, which returns 422 below it. */
+export const MIN_SEATS = 3;
+
+export const PLANS: Plan[] = [
+  {
+    id: "free",
+    name: "Free",
+    annualPrice: 0,
+    monthlyPrice: 0,
+    period: "forever",
+    savings: null,
+    desc: "Everything you need, no account required.",
+    trial: null,
+    perSeat: false,
+    features: [
+      "All core SSH features",
+      "SFTP with drag & drop",
+      "Docker & serial console",
+      "Gist E2EE sync (free)",
+      "Plugin system",
+      "Custom themes",
+      "Local terminal",
+      "Persistent sessions & workspace restore",
+      "Port forwarding",
+      "Audit logs",
+      "Snippets & command palette",
+      "Import / Export (no lock-in)",
+    ],
+  },
+  {
+    id: "pro",
+    name: "Pro",
+    annualPrice: 7,
+    monthlyPrice: 9,
+    period: "/ month",
+    savings: "Save 22% with annual billing",
+    desc: "Real-time sync and unlimited vaults for power users.",
+    trial: { days: 14, creditCardRequired: false },
+    perSeat: false,
+    features: [
+      "Everything in Free",
+      "Real-time cloud sync (CRDTs)",
+      "Sub-second updates via SSE",
+      "Cross-device sessions — one live terminal, shared on all your devices",
+      "Unlimited private vaults",
+      "Real-time collaboration — 1 session · 1 participant",
+    ],
+  },
+  {
+    id: "teams",
+    name: "Teams",
+    annualPrice: 15,
+    monthlyPrice: 18,
+    period: "/ user / month",
+    savings: "Save 17% with annual billing",
+    desc: "Shared vaults, live terminals, and access control for teams (3-user minimum).",
+    trial: { days: 14, creditCardRequired: true },
+    perSeat: true,
+    features: [
+      "Everything in Pro",
+      "Team vaults & invites",
+      "Real-time collaboration — 5 sessions · 10 participants each",
+      "Built-in roles (Owner, Manager, Editor, Member)",
+      "Team audit logs",
+    ],
+  },
+  {
+    id: "business",
+    name: "Business",
+    annualPrice: 25,
+    monthlyPrice: 30,
+    period: "/ user / month",
+    savings: "Save 17% with annual billing",
+    desc: "Commercial license, advanced collaboration, and dedicated support for organizations (3-user minimum).",
+    trial: null,
+    perSeat: true,
+    features: [
+      "Everything in Teams",
+      "Real-time collaboration — 20 sessions · 50 participants each",
+      "Custom roles & granular permissions",
+      "Commercial license",
+      "Priority support",
+      "Custom contracts",
+    ],
+  },
+];
+
+export const PLAN_ORDER: Record<PlanId, number> = { free: 0, pro: 1, teams: 2, business: 3 };
+
+export const PER_SEAT_PLAN_IDS: PlanId[] = PLANS.filter((p) => p.perSeat).map((p) => p.id);
+
+/** Order lookup that tolerates an arbitrary tier string from the server. */
+export function planOrder(id: string): number {
+  return PLAN_ORDER[id as PlanId] ?? 0;
+}
+
+export function planById(id: string): Plan | undefined {
+  return PLANS.find((p) => p.id === id);
+}
+
+/** "$15" — whole dollars, which every current price is. */
+export function priceLabel(amount: number): string {
+  return `$${amount}`;
+}
+
+/** "14-day free trial" */
+export function trialLabel(trial: PlanTrial): string {
+  return `${trial.days}-day free trial`;
+}
+
+/** "credit card required" / "no credit card required" */
+export function trialCardLabel(trial: PlanTrial): string {
+  return trial.creditCardRequired ? "credit card required" : "no credit card required";
+}