diff --git a/package.json b/package.json
index c47da4d..fa6b414 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "ttrpg-player-landing",
   "private": true,
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Marketing landing for TTRPG Player (НРИ Плеер)",
   "type": "module",
   "scripts": {
diff --git a/src/components/sections/Platforms.tsx b/src/components/sections/Platforms.tsx
index 3f39924..bfd73a1 100644
--- a/src/components/sections/Platforms.tsx
+++ b/src/components/sections/Platforms.tsx
@@ -7,6 +7,7 @@ import {
   resolveDownloadHref,
   resolvePlatformDownloadHref,
 } from "../../lib/detectOs";
+import { trackDownload } from "../../lib/trackDownload";
 import { Section } from "../layout/Section";
 import { Button } from "../ui/Button";
 import { PlatformLogo } from "../ui/PlatformLogo";
@@ -28,11 +29,24 @@ export function Platforms() {
 
   const hints = useMemo(() => readNavigatorHints(), []);
 
-  const osDownloadHref = useMemo(() => {
+  const { osDownloadHref, detectedOs } = useMemo(() => {
     const os = detectOs(hints.userAgent);
-    return resolveDownloadHref(os, DOWNLOAD_LINKS, hints);
+    return {
+      osDownloadHref: resolveDownloadHref(os, DOWNLOAD_LINKS, hints),
+      detectedOs: os,
+    };
   }, [hints]);
 
+  const trackOsDownload = () => {
+    const platform =
+      detectedOs === "windows" ||
+      detectedOs === "macos" ||
+      detectedOs === "linux"
+        ? detectedOs
+        : "windows";
+    trackDownload(platform);
+  };
+
   const platformDownloadHrefs = useMemo(
     () =>
       Object.fromEntries(
@@ -58,6 +72,9 @@ export function Platforms() {
                 href={platformDownloadHrefs[id]}
                 variant="ghost"
                 className={styles.downloadBtn}
+                onClick={() => {
+                  trackDownload(id);
+                }}
               >
                 {copy.cta.download}
               </Button>
@@ -72,7 +89,9 @@ export function Platforms() {
       </p>
 
       <div className={styles.mainCta}>
-        <Button href={osDownloadHref}>{copy.cta.downloadForOs}</Button>
+        <Button href={osDownloadHref} onClick={trackOsDownload}>
+          {copy.cta.downloadForOs}
+        </Button>
       </div>
     </Section>
   );
diff --git a/src/components/ui/Button.tsx b/src/components/ui/Button.tsx
index aceada3..2114aa3 100644
--- a/src/components/ui/Button.tsx
+++ b/src/components/ui/Button.tsx
@@ -34,6 +34,7 @@ export function Button({
       <a
         className={cls}
         href={href}
+        onClick={onClick}
         {...(newTab
           ? { target: "_blank", rel: "noopener noreferrer" }
           : undefined)}
diff --git a/src/lib/trackDownload.test.ts b/src/lib/trackDownload.test.ts
new file mode 100644
index 0000000..545ed34
--- /dev/null
+++ b/src/lib/trackDownload.test.ts
@@ -0,0 +1,47 @@
+import assert from "node:assert/strict";
+import { afterEach, describe, it, mock } from "node:test";
+
+import {
+  DEFAULT_LICENSE_TRACKING_BASE,
+  resolveTrackDownloadUrl,
+  trackDownload,
+} from "./trackDownload";
+
+describe("trackDownload", () => {
+  afterEach(() => {
+    mock.restoreAll();
+  });
+
+  it("builds default tracking URL", () => {
+    assert.equal(
+      resolveTrackDownloadUrl(DEFAULT_LICENSE_TRACKING_BASE),
+      "https://license.ttrpgplayer.ru/v1/track/download",
+    );
+  });
+
+  it("normalizes base URL without trailing slash", () => {
+    assert.equal(
+      resolveTrackDownloadUrl("https://license.example.test"),
+      "https://license.example.test/v1/track/download",
+    );
+  });
+
+  it("POSTs platform with keepalive and swallows errors", async () => {
+    const fetchMock = mock.fn(() => Promise.reject(new Error("network down")));
+    globalThis.fetch = fetchMock;
+
+    trackDownload("macos");
+
+    await new Promise((resolve) => setTimeout(resolve, 0));
+
+    assert.equal(fetchMock.mock.calls.length, 1);
+    const call = fetchMock.mock.calls[0];
+    assert.ok(call);
+    const [url, init] = call.arguments as unknown as [string, RequestInit];
+    assert.equal(url, "https://license.ttrpgplayer.ru/v1/track/download");
+    assert.equal(init.method, "POST");
+    assert.equal(init.keepalive, true);
+    assert.deepEqual(init.headers, { "Content-Type": "application/json" });
+    assert.equal(init.body, JSON.stringify({ platform: "macos" }));
+  });
+});
diff --git a/src/lib/trackDownload.ts b/src/lib/trackDownload.ts
new file mode 100644
index 0000000..6ffcbca
--- /dev/null
+++ b/src/lib/trackDownload.ts
@@ -0,0 +1,35 @@
+import type { PlatformId } from "../data/siteContent";
+
+export const DEFAULT_LICENSE_TRACKING_BASE = "https://license.ttrpgplayer.ru/";
+
+function normalizeBaseUrl(base: string): string {
+  return base.endsWith("/") ? base : `${base}/`;
+}
+
+export function resolveLicenseTrackingBase(): string {
+  const fromEnv =
+    typeof import.meta.env !== "undefined"
+      ? import.meta.env.VITE_LICENSE_TRACKING_URL
+      : undefined;
+  if (typeof fromEnv === "string" && fromEnv.trim()) {
+    return normalizeBaseUrl(fromEnv.trim());
+  }
+  return DEFAULT_LICENSE_TRACKING_BASE;
+}
+
+export function resolveTrackDownloadUrl(base?: string): string {
+  return `${normalizeBaseUrl(base ?? resolveLicenseTrackingBase())}v1/track/download`;
+}
+
+export function trackDownload(platform: PlatformId): void {
+  if (typeof fetch === "undefined") return;
+
+  void fetch(resolveTrackDownloadUrl(), {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ platform }),
+    keepalive: true,
+  }).catch(() => {
+    // fire-and-forget: ignore network errors
+  });
+}
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
index 11f02fe..ae3a532 100644
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -1 +1,9 @@
 /// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_LICENSE_TRACKING_URL?: string;
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv;
+}