diff --git a/apps/web/src/lib/ui/data/TaskItem.svelte b/apps/web/src/lib/ui/data/TaskItem.svelte
index bcd1f25..6597b45 100644
--- a/apps/web/src/lib/ui/data/TaskItem.svelte
+++ b/apps/web/src/lib/ui/data/TaskItem.svelte
@@ -8,6 +8,8 @@
 	} from "$lib/utils/date";
 	import { success, error as toastError } from "$lib/stores/toasts";
 	import { tick } from "svelte";
+	import Popover from "$lib/ui/feedback/Popover.svelte";
+	import { normalizeDigits, buildWaMeUrl } from "$lib/utils/phone";
 
 	export let id: number;
 	export let description: string;
@@ -32,6 +34,15 @@
 	let dateValue: string = due_date ?? "";
 	let busy = false;
 
+	// Popover de responsables
+	let showAssignees = false;
+	let assigneesButtonEl: HTMLButtonElement | null = null;
+	$: assigneesCount = Array.isArray(assignees) ? assignees.length : 0;
+	$: assigneesLabel =
+		assigneesCount === 0
+			? "Sin responsable"
+			: `Responsables: ${assigneesCount}${isAssigned ? " (tú)" : ""}`;
+
 	// Edición de texto (inline)
 	let editingText = false;
 	let descEl: HTMLElement | null = null;
@@ -270,13 +281,20 @@
 			</span>
 		{/if}
 	</div>
-	{#if assignees?.length}
-		<div class="assignees">
-			{#each assignees as a}
-				<span class="assignee" title={a}>👤</span>
-			{/each}
-		</div>
-	{/if}
+	<div class="assignees">
+		<button
+			class="assignees-badge"
+			type="button"
+			aria-haspopup="dialog"
+			aria-expanded={showAssignees}
+			aria-controls={"assignees-popover-" + id}
+			title={assigneesCount === 0 ? "Sin responsable" : "Ver responsables"}
+			on:click|preventDefault={() => (showAssignees = true)}
+			bind:this={assigneesButtonEl}
+		>
+			👥 {assigneesLabel}
+		</button>
+	</div>
 	<div class="actions">
 		{#if !completed}
 			{#if !isAssigned}
@@ -356,6 +374,28 @@
 			{/if}
 		{/if}
 	</div>
+	<Popover bind:open={showAssignees} ariaLabel="Responsables" id={"assignees-popover-" + id} on:closed={() => { tick().then(() => assigneesButtonEl?.focus()); }}>
+		<h3 class="popover-title">Responsables</h3>
+		{#if assigneesCount === 0}
+			<p class="muted">No hay responsables asignados.</p>
+		{:else}
+			<ul class="assignees-list">
+				{#each assignees as a}
+					<li>
+						<a href={buildWaMeUrl(normalizeDigits(a))} target="_blank" rel="noreferrer nofollow">
+							{normalizeDigits(a)}
+						</a>
+						{#if currentUserId && normalizeDigits(a) === normalizeDigits(currentUserId)}
+							<span class="you-pill">tú</span>
+						{/if}
+					</li>
+				{/each}
+			</ul>
+		{/if}
+		<div class="popover-actions">
+			<button class="btn ghost" on:click={() => (showAssignees = false)}>Cerrar</button>
+		</div>
+	</Popover>
 </li>
 
 <style>
@@ -524,9 +564,6 @@
 		.meta {
 			justify-self: end;
 		}
-		.assignees {
-			display: none;
-		}
 		.actions {
 			grid-row: 3/4;
 			grid-column: 1/3;
@@ -536,4 +573,57 @@
 			padding: 2px;
 		}
 	}
+
+	/* Badge de responsables */
+	.assignees-badge {
+		display: inline-flex;
+		align-items: center;
+		gap: 6px;
+		padding: 2px 8px;
+		border-radius: 999px;
+		border: 1px solid var(--color-border);
+		background: var(--color-surface);
+		font-size: 12px;
+		cursor: pointer;
+	}
+	.assignees-badge[aria-expanded="true"] {
+		border-color: var(--color-primary);
+	}
+
+	.assignees-list {
+		list-style: none;
+		margin: 8px 0;
+		padding: 0;
+	}
+	.assignees-list li {
+		display: flex;
+		align-items: center;
+		gap: 8px;
+		padding: 4px 0;
+	}
+	.assignees-list a {
+		color: var(--color-primary);
+		text-decoration: none;
+	}
+	.assignees-list a:hover,
+	.assignees-list a:focus-visible {
+		text-decoration: underline;
+	}
+	.popover-actions {
+		display: flex;
+		justify-content: flex-end;
+		margin-top: 8px;
+	}
+	.popover-title {
+		margin: 0 0 4px 0;
+		font-size: 0.95rem;
+	}
+	.you-pill {
+		margin-left: 6px;
+		padding: 1px 6px;
+		border-radius: 999px;
+		background: rgba(37, 99, 235, 0.12);
+		color: var(--color-primary);
+		font-size: 11px;
+	}
 </style>
diff --git a/apps/web/src/lib/ui/feedback/Popover.svelte b/apps/web/src/lib/ui/feedback/Popover.svelte
new file mode 100644
index 0000000..f7ce341
--- /dev/null
+++ b/apps/web/src/lib/ui/feedback/Popover.svelte
@@ -0,0 +1,111 @@
+<script lang="ts">
+  import { tick, onDestroy } from 'svelte';
+  import { createEventDispatcher } from 'svelte';
+
+  export let open: boolean = false;
+  export let ariaLabel: string = 'Diálogo';
+  export let id: string | undefined;
+
+  const dispatch = createEventDispatcher();
+  let panelEl: HTMLElement | null = null;
+  let lastActive: Element | null = null;
+
+  function close() {
+    open = false;
+    dispatch('closed');
+  }
+
+  function handleKeydown(e: KeyboardEvent) {
+    if (e.key === 'Escape') {
+      e.preventDefault();
+      close();
+    } else if (e.key === 'Tab' && panelEl) {
+      const focusables = Array.from(
+        panelEl.querySelectorAll<HTMLElement>(
+          'a[href], button:not([disabled]), textarea, input, select, [tabindex]:not([tabindex="-1"])'
+        )
+      ).filter((el) => el.offsetParent !== null);
+      if (focusables.length === 0) {
+        e.preventDefault();
+        return;
+      }
+      const first = focusables[0];
+      const last = focusables[focusables.length - 1];
+      const active = document.activeElement as HTMLElement | null;
+      if (e.shiftKey) {
+        if (active === first || !panelEl.contains(active)) {
+          e.preventDefault();
+          last.focus();
+        }
+      } else {
+        if (active === last) {
+          e.preventDefault();
+          first.focus();
+        }
+      }
+    }
+  }
+
+  $: if (open) {
+    lastActive = document.activeElement;
+    tick().then(() => {
+      panelEl?.focus();
+      document.body.style.overflow = 'hidden';
+    });
+  } else {
+    document.body.style.overflow = '';
+    if (lastActive instanceof HTMLElement) {
+      tick().then(() => lastActive?.focus());
+    }
+  }
+
+  onDestroy(() => {
+    document.body.style.overflow = '';
+  });
+</script>
+
+{#if open}
+  <div class="popover-overlay" on:click={close} />
+  <div
+    class="popover-panel"
+    role="dialog"
+    aria-modal="true"
+    {id}
+    aria-label={ariaLabel}
+    tabindex="-1"
+    bind:this={panelEl}
+    on:keydown={handleKeydown}
+  >
+    <slot />
+  </div>
+{/if}
+
+<style>
+  .popover-overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.35);
+    z-index: 1000;
+  }
+  .popover-panel {
+    position: fixed;
+    z-index: 1001;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    max-width: min(420px, 92vw);
+    width: 92vw;
+    background: var(--color-surface);
+    color: var(--color-text);
+    border: 1px solid var(--color-border);
+    border-radius: 10px;
+    box-shadow: var(--shadow-lg);
+    padding: 12px;
+    outline: none;
+  }
+  @media (prefers-color-scheme: dark) {
+    .popover-overlay {
+      background: rgba(0, 0, 0, 0.5);
+    }
+  }
+</style>
diff --git a/apps/web/src/lib/utils/phone.ts b/apps/web/src/lib/utils/phone.ts
new file mode 100644
index 0000000..94de330
--- /dev/null
+++ b/apps/web/src/lib/utils/phone.ts
@@ -0,0 +1,8 @@
+export function normalizeDigits(input: string | null | undefined): string {
+  return String(input ?? '').replace(/\D+/g, '');
+}
+
+export function buildWaMeUrl(input: string): string {
+  const digits = normalizeDigits(input);
+  return `https://wa.me/${digits}`;
+}