diff --git a/src/components/AddonList.tsx b/src/components/AddonList.tsx
index cb8156d..08782cb 100644
--- a/src/components/AddonList.tsx
+++ b/src/components/AddonList.tsx
@@ -1,13 +1,14 @@
 import type { AddonData } from '../types';
-import { formatMoney } from '../lib/format';
+import { addonPriceForDevices, formatMoney } from '../lib/format';
 
 interface AddonListProps {
   addons: AddonData[];
+  devices: number;
   selected: string[];
   onToggle: (id: string) => void;
 }
 
-export function AddonList({ addons, selected, onToggle }: AddonListProps) {
+export function AddonList({ addons, devices, selected, onToggle }: AddonListProps) {
   if (addons.length === 0) return null;
   return (
     <div className="plan-addons">
@@ -18,6 +19,7 @@ export function AddonList({ addons, selected, onToggle }: AddonListProps) {
       <div className="addon-list">
         {addons.map((a) => {
           const on = selected.includes(a.id);
+          const price = addonPriceForDevices(a, devices);
           return (
             <button
               key={a.id}
@@ -31,8 +33,7 @@ export function AddonList({ addons, selected, onToggle }: AddonListProps) {
                 <span className="addon-name">{a.name}</span>
               </span>
               <span className="addon-price">
-                <span className="plus">+</span>
-                {formatMoney(a.price)}
+                {price === 0 ? 'Бесплатно' : <><span className="plus">+</span>{formatMoney(price)}</>}
               </span>
             </button>
           );
diff --git a/src/lib/format.test.ts b/src/lib/format.test.ts
index c4aad22..1c02b5f 100644
--- a/src/lib/format.test.ts
+++ b/src/lib/format.test.ts
@@ -14,8 +14,8 @@ import type { AddonData, PricingPlans } from '../types';
 const pricing: PricingPlans = {
   device_price: 100,
   addons: [
-    { id: 'a', name: 'A', price: 50, free_threshold: 0 },
-    { id: 'b', name: 'B', price: 30, free_threshold: 0 },
+    { id: 'a', name: 'A', price: 50, free_threshold: -1 },
+    { id: 'b', name: 'B', price: 30, free_threshold: -1 },
   ],
 };
 
@@ -30,10 +30,20 @@ describe('round2', () => {
 describe('sumAddonPrices', () => {
   const addons: AddonData[] = pricing.addons;
   it('sums selected addon prices', () => {
-    expect(sumAddonPrices(addons, ['a', 'b'])).toBe(80);
-    expect(sumAddonPrices(addons, ['a'])).toBe(50);
-    expect(sumAddonPrices(addons, ['unknown'])).toBe(0);
-    expect(sumAddonPrices(addons, [])).toBe(0);
+    expect(sumAddonPrices(addons, ['a', 'b'], 6)).toBe(80);
+    expect(sumAddonPrices(addons, ['a'], 6)).toBe(50);
+    expect(sumAddonPrices(addons, ['unknown'], 6)).toBe(0);
+    expect(sumAddonPrices(addons, [], 6)).toBe(0);
+  });
+
+  it('makes addons free at their device threshold but keeps -1 paid', () => {
+    const thresholdAddons: AddonData[] = [
+      { id: 'threshold', name: 'Threshold', price: 50, free_threshold: 6 },
+      { id: 'paid', name: 'Paid', price: 30, free_threshold: -1 },
+    ];
+
+    expect(sumAddonPrices(thresholdAddons, ['threshold', 'paid'], 5)).toBe(80);
+    expect(sumAddonPrices(thresholdAddons, ['threshold', 'paid'], 6)).toBe(30);
   });
 });
 
diff --git a/src/lib/format.ts b/src/lib/format.ts
index 39d3c12..ad576b0 100644
--- a/src/lib/format.ts
+++ b/src/lib/format.ts
@@ -55,7 +55,7 @@ export interface PricingBreakdown {
 
 /**
  * Mirrors the backend `services/subscriptions.py`:
- *   monthly = devices * device_price + sum(selected addon prices)
+ *   monthly = devices * device_price + sum(selected applicable addon prices)
  *   total   = monthly * duration_days / 30
  */
 export function calculatePricing({
@@ -65,7 +65,7 @@ export function calculatePricing({
   duration,
 }: PricingInput): PricingBreakdown {
   const deviceCost = pricing.device_price * devices;
-  const addonCost = sumAddonPrices(pricing.addons, addonIds);
+  const addonCost = sumAddonPrices(pricing.addons, addonIds, devices);
   const monthly = deviceCost + addonCost;
   const periodTotal = round2((monthly * duration.days) / 30);
   return {
@@ -76,9 +76,16 @@ export function calculatePricing({
   };
 }
 
-export function sumAddonPrices(addons: AddonData[], selected: string[]): number {
-  const priceById = new Map(addons.map((a) => [a.id, a.price] as const));
-  return selected.reduce<number>((sum, id) => sum + (priceById.get(id) ?? 0), 0);
+export function addonPriceForDevices(addon: AddonData, devices: number): number {
+  return addon.free_threshold >= 0 && devices >= addon.free_threshold ? 0 : addon.price;
+}
+
+export function sumAddonPrices(addons: AddonData[], selected: string[], devices: number): number {
+  const addonById = new Map(addons.map((addon) => [addon.id, addon] as const));
+  return selected.reduce<number>((sum, id) => {
+    const addon = addonById.get(id);
+    return sum + (addon ? addonPriceForDevices(addon, devices) : 0);
+  }, 0);
 }
 
 /* ── Date ────────────────────────────────────────────────── */
diff --git a/src/pages/PlanPage.test.tsx b/src/pages/PlanPage.test.tsx
index 3141057..f102d03 100644
--- a/src/pages/PlanPage.test.tsx
+++ b/src/pages/PlanPage.test.tsx
@@ -43,8 +43,8 @@ function renderPlan(initialEntries: string[] = ['/plan']) {
 const PLANS = {
   device_price: 100,
   addons: [
-    { id: 'dedicated-ip', name: 'Dedicated IP', price: 50, free_threshold: 0 },
-    { id: 'multi-hop', name: 'Multi-Hop', price: 30, free_threshold: 0 },
+    { id: 'dedicated-ip', name: 'Dedicated IP', price: 50, free_threshold: -1 },
+    { id: 'multi-hop', name: 'Multi-Hop', price: 30, free_threshold: -1 },
   ],
 };
 
diff --git a/src/pages/PlanPage.tsx b/src/pages/PlanPage.tsx
index 23d5a42..f1d9ada 100644
--- a/src/pages/PlanPage.tsx
+++ b/src/pages/PlanPage.tsx
@@ -166,6 +166,7 @@ export function PlanPage() {
               <Reveal>
                 <AddonList
                   addons={plans.addons}
+                  devices={devices}
                   selected={selectedAddons}
                   onToggle={toggleAddon}
                 />