diff --git a/apps/web/src/lib/server/ics.ts b/apps/web/src/lib/server/ics.ts
index dcff319..c5c3df0 100644
--- a/apps/web/src/lib/server/ics.ts
+++ b/apps/web/src/lib/server/ics.ts
@@ -1,4 +1,5 @@
 import { sha256Hex } from './crypto';
+import { icsRateLimitPerMin } from './env';
 
 function escapeIcsText(s: string): string {
   return String(s)
@@ -55,11 +56,33 @@ export type IcsEvent = {
   prefix?: string; // ej: "T" para [T0123]
 };
 
+// Rate limiting por token (ventana 1 minuto)
+const __icsRateMap = new Map<string, { start: number; count: number }>();
+
+export function checkIcsRateLimit(tokenKey: string): { ok: boolean; retryAfterSec?: number } {
+  const limit = Number(icsRateLimitPerMin || 0);
+  if (!Number.isFinite(limit) || limit <= 0) return { ok: true };
+  const now = Date.now();
+  const windowMs = 60 * 1000;
+  const winStart = Math.floor(now / windowMs) * windowMs;
+  const rec = __icsRateMap.get(tokenKey);
+  if (!rec || rec.start !== winStart) {
+    __icsRateMap.set(tokenKey, { start: winStart, count: 1 });
+    return { ok: true };
+  }
+  if (rec.count < limit) {
+    rec.count += 1;
+    return { ok: true };
+  }
+  const retryAfterSec = Math.max(1, Math.ceil((rec.start + windowMs - now) / 1000));
+  return { ok: false, retryAfterSec };
+}
+
 export async function buildIcsCalendar(title: string, events: IcsEvent[]): Promise<{ body: string; etag: string }> {
   const lines: string[] = [];
   lines.push('BEGIN:VCALENDAR');
   lines.push('VERSION:2.0');
-  lines.push('PRODID:-//TaskWhatsApp//Calendar//ES');
+  lines.push('PRODID:-/Wtask.org//ICS 1.0//ES');
   lines.push('CALSCALE:GREGORIAN');
   lines.push('METHOD:PUBLISH');
   lines.push(`X-WR-CALNAME:${escapeIcsText(title)}`);
diff --git a/apps/web/src/routes/ics/aggregate/[token].ics/+server.ts b/apps/web/src/routes/ics/aggregate/[token].ics/+server.ts
index a5d45e3..dea5c66 100644
--- a/apps/web/src/routes/ics/aggregate/[token].ics/+server.ts
+++ b/apps/web/src/routes/ics/aggregate/[token].ics/+server.ts
@@ -2,7 +2,7 @@ import type { RequestHandler } from './$types';
 import { getDb } from '$lib/server/db';
 import { sha256Hex } from '$lib/server/crypto';
 import { icsHorizonMonths } from '$lib/server/env';
-import { buildIcsCalendar } from '$lib/server/ics';
+import { buildIcsCalendar, checkIcsRateLimit } from '$lib/server/ics';
 import { toIsoSqlUTC, ymdUTC, addMonthsUTC } from '$lib/server/datetime';
 
 export const GET: RequestHandler = async ({ params, request }) => {
@@ -24,6 +24,11 @@ export const GET: RequestHandler = async ({ params, request }) => {
   if (row.revoked_at) return new Response('Gone', { status: 410 });
   if (String(row.type) !== 'aggregate') return new Response('Not Found', { status: 404 });
 
+  const rl = checkIcsRateLimit(tokenHash);
+  if (!rl.ok) {
+    return new Response('Too Many Requests', { status: 429, headers: { 'Retry-After': String(rl.retryAfterSec || 60) } });
+  }
+
   const today = new Date();
   const startYmd = ymdUTC(today);
   const endYmd = ymdUTC(addMonthsUTC(today, icsHorizonMonths));
@@ -52,12 +57,11 @@ export const GET: RequestHandler = async ({ params, request }) => {
     prefix: 'T'
   }));
 
-  const { body, etag } = await buildIcsCalendar('Tareas sin responsable (mis grupos)', events);
+  const { body, etag } = await buildIcsCalendar('Wtask.org Tareas – Agregado', events);
 
   // 304 si ETag coincide
   const inm = request.headers.get('if-none-match');
   if (inm && inm === etag) {
-    db.prepare(`UPDATE calendar_tokens SET last_used_at = ? WHERE id = ?`).run(toIsoSqlUTC(), row.id);
     return new Response(null, { status: 304, headers: { ETag: etag, 'Cache-Control': 'public, max-age=300' } });
   }
 
diff --git a/apps/web/src/routes/ics/group/[token].ics/+server.ts b/apps/web/src/routes/ics/group/[token].ics/+server.ts
index 185b946..fdc7917 100644
--- a/apps/web/src/routes/ics/group/[token].ics/+server.ts
+++ b/apps/web/src/routes/ics/group/[token].ics/+server.ts
@@ -2,7 +2,7 @@ import type { RequestHandler } from './$types';
 import { getDb } from '$lib/server/db';
 import { sha256Hex } from '$lib/server/crypto';
 import { icsHorizonMonths } from '$lib/server/env';
-import { buildIcsCalendar } from '$lib/server/ics';
+import { buildIcsCalendar, checkIcsRateLimit } from '$lib/server/ics';
 import { toIsoSqlUTC, ymdUTC, addMonthsUTC } from '$lib/server/datetime';
 
 export const GET: RequestHandler = async ({ params, request }) => {
@@ -29,10 +29,14 @@ export const GET: RequestHandler = async ({ params, request }) => {
     .prepare(`SELECT COALESCE(active,1) as active, COALESCE(archived,0) as archived, COALESCE(is_community,0) as is_community FROM groups WHERE id = ?`)
     .get(row.group_id) as any;
   if (!gRow || Number(gRow.active || 0) !== 1 || Number(gRow.archived || 0) === 1 || Number(gRow.is_community || 0) === 1) {
-    db.prepare(`UPDATE calendar_tokens SET last_used_at = ? WHERE id = ?`).run(toIsoSqlUTC(), row.id);
     return new Response('Gone', { status: 410 });
   }
 
+  const rl = checkIcsRateLimit(tokenHash);
+  if (!rl.ok) {
+    return new Response('Too Many Requests', { status: 429, headers: { 'Retry-After': String(rl.retryAfterSec || 60) } });
+  }
+
   const today = new Date();
   const startYmd = ymdUTC(today);
   const endYmd = ymdUTC(addMonthsUTC(today, icsHorizonMonths));
@@ -59,13 +63,11 @@ export const GET: RequestHandler = async ({ params, request }) => {
     prefix: 'T'
   }));
 
-  const { body, etag } = await buildIcsCalendar('Tareas sin responsable (grupo)', events);
+  const { body, etag } = await buildIcsCalendar('Wtask.org Tareas – Grupo', events);
 
   // 304 si ETag coincide
   const inm = request.headers.get('if-none-match');
   if (inm && inm === etag) {
-    // Actualizar last_used_at aunque sea 304
-    db.prepare(`UPDATE calendar_tokens SET last_used_at = ? WHERE id = ?`).run(toIsoSqlUTC(), row.id);
     return new Response(null, { status: 304, headers: { ETag: etag, 'Cache-Control': 'public, max-age=300' } });
   }
 
diff --git a/apps/web/src/routes/ics/personal/[token].ics/+server.ts b/apps/web/src/routes/ics/personal/[token].ics/+server.ts
index 3507d41..28c2986 100644
--- a/apps/web/src/routes/ics/personal/[token].ics/+server.ts
+++ b/apps/web/src/routes/ics/personal/[token].ics/+server.ts
@@ -2,7 +2,7 @@ import type { RequestHandler } from './$types';
 import { getDb } from '$lib/server/db';
 import { sha256Hex } from '$lib/server/crypto';
 import { icsHorizonMonths } from '$lib/server/env';
-import { buildIcsCalendar } from '$lib/server/ics';
+import { buildIcsCalendar, checkIcsRateLimit } from '$lib/server/ics';
 import { toIsoSqlUTC, ymdUTC, addMonthsUTC } from '$lib/server/datetime';
 
 export const GET: RequestHandler = async ({ params, request }) => {
@@ -24,6 +24,11 @@ export const GET: RequestHandler = async ({ params, request }) => {
   if (row.revoked_at) return new Response('Gone', { status: 410 });
   if (String(row.type) !== 'personal') return new Response('Not Found', { status: 404 });
 
+  const rl = checkIcsRateLimit(tokenHash);
+  if (!rl.ok) {
+    return new Response('Too Many Requests', { status: 429, headers: { 'Retry-After': String(rl.retryAfterSec || 60) } });
+  }
+
   const today = new Date();
   const startYmd = ymdUTC(today);
   const endYmd = ymdUTC(addMonthsUTC(today, icsHorizonMonths));
@@ -53,12 +58,11 @@ export const GET: RequestHandler = async ({ params, request }) => {
     prefix: 'T'
   }));
 
-  const { body, etag } = await buildIcsCalendar('Mis tareas', events);
+  const { body, etag } = await buildIcsCalendar('Wtask.org Tareas – Personal', events);
 
   // 304 si ETag coincide
   const inm = request.headers.get('if-none-match');
   if (inm && inm === etag) {
-    db.prepare(`UPDATE calendar_tokens SET last_used_at = ? WHERE id = ?`).run(toIsoSqlUTC(), row.id);
     return new Response(null, { status: 304, headers: { ETag: etag, 'Cache-Control': 'public, max-age=300' } });
   }