diff --git a/.env.example b/.env.example
index feef5a6..7090dcf 100644
--- a/.env.example
+++ b/.env.example
@@ -37,6 +37,18 @@ MONITORINK_NAS_URL=http://192.168.0.43:8766/api/status
 # Hermes monté en lecture seule (cf. docker-compose.yml). Laisser vide pour masquer Codex.
 MONITORINK_CODEX_TOKEN_FILE=/hermes/auth.json
 
+# Trackers torrent privés (optionnel) — ratio/envoi/réception du compte, sous le NAS.
+# Liste des clés actives, puis UN bloc par tracker. v1 : type "unit3d_nuxt" (ex. c411).
+# Le ratio n'est PAS lisible au token API -> login requis (username/password du compte).
+# Laisser MONITORINK_TRACKERS vide pour masquer la section.
+#MONITORINK_TRACKERS=c411
+#MONITORINK_TRACKER_C411_LABEL=c411
+#MONITORINK_TRACKER_C411_TYPE=unit3d_nuxt
+#MONITORINK_TRACKER_C411_URL=https://c411.org
+#MONITORINK_TRACKER_C411_USER=TonUsername
+#MONITORINK_TRACKER_C411_PASS=TonMotDePasse
+#MONITORINK_TRACKER_TTL=1800
+
 # Home Assistant (optionnel) — laisser vide pour désactiver
 MONITORINK_HA_URL=http://homeassistant.local:8123
 MONITORINK_HA_TOKEN=
diff --git a/backend/config.py b/backend/config.py
index db78d53..b05d803 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -39,6 +39,19 @@ class HAEntity:
         return cls(entity_id=entity_id, label=label, unit=unit)
 
 
+@dataclass(frozen=True)
+class TrackerSpec:
+    """Un tracker torrent privé dont on affiche le ratio. `type` choisit le fetcher
+    (v1 : `unit3d_nuxt`). Identifiants jamais versionnés (lus depuis `.env`)."""
+
+    key: str
+    label: str
+    base_url: str
+    username: str
+    password: str
+    type: str = "unit3d_nuxt"
+
+
 @dataclass(frozen=True)
 class Config:
     # --- Affichage ---
@@ -84,6 +97,13 @@ class Config:
         default_factory=lambda: _get("MONITORINK_CODEX_TOKEN_FILE", "/hermes/auth.json")
     )
 
+    # --- Trackers torrent privés (ratio du compte) ---
+    # Le ratio change lentement et le login est coûteux (CSRF + session) : on cache
+    # le résultat plus longtemps que le reste (défaut 30 min).
+    tracker_ttl_seconds: int = field(
+        default_factory=lambda: int(_get("MONITORINK_TRACKER_TTL", "1800"))
+    )
+
     # --- Cache / rafraîchissement serveur ---
     cache_ttl_seconds: int = field(
         default_factory=lambda: int(_get("MONITORINK_CACHE_TTL", "120"))
@@ -106,6 +126,26 @@ class Config:
     def ha_entities(self) -> list[HAEntity]:
         return [HAEntity.parse(s) for s in _get_list("MONITORINK_HA_ENTITIES")]
 
+    @property
+    def trackers(self) -> list[TrackerSpec]:
+        """Trackers actifs : `MONITORINK_TRACKERS=c411,autre` + un bloc d'env par clé,
+        ex. `MONITORINK_TRACKER_C411_{URL,USER,PASS,LABEL,TYPE}`."""
+        specs: list[TrackerSpec] = []
+        for key in _get_list("MONITORINK_TRACKERS"):
+            k = key.upper().replace("-", "_")
+            base = _get(f"MONITORINK_TRACKER_{k}_URL").rstrip("/")
+            if not base:
+                continue
+            specs.append(TrackerSpec(
+                key=key,
+                label=_get(f"MONITORINK_TRACKER_{k}_LABEL", key),
+                base_url=base,
+                username=_get(f"MONITORINK_TRACKER_{k}_USER"),
+                password=_get(f"MONITORINK_TRACKER_{k}_PASS"),
+                type=_get(f"MONITORINK_TRACKER_{k}_TYPE", "unit3d_nuxt"),
+            ))
+        return specs
+
     @property
     def ha_enabled(self) -> bool:
         return bool(self.ha_base_url and self.ha_token)
diff --git a/backend/integrations/trackers.py b/backend/integrations/trackers.py
new file mode 100644
index 0000000..0a7d559
--- /dev/null
+++ b/backend/integrations/trackers.py
@@ -0,0 +1,151 @@
+"""Ratio des trackers torrent privés (envoi / réception / ratio du compte).
+
+Conçu pour PLUSIEURS trackers : chaque `TrackerSpec` a un `type` qui sélectionne le
+fetcher (`_FETCHERS`). v1 implémente `unit3d_nuxt` — frontend Nuxt au-dessus de UNIT3D
+(ex. c411). Le ratio n'y est PAS lisible avec une clé API : il faut une session (login).
+Flux :
+  1. GET  {base}/login              -> pose le cookie `__csrf` + un meta `<csrf-token>`
+  2. POST {base}/api/auth/login     -> header `csrf-token` + {username,password} ;
+                                       pose le cookie de session (~7 j)
+  3. GET  {base}/api/users/{user}   -> profil JSON avec ratio/uploaded/downloaded
+La session (cookies) est réutilisée entre rendus ; on ne relogue que si elle a expiré
+(le profil revient non authentifié). Le résultat est caché (`tracker_ttl_seconds`) car
+le ratio bouge lentement et le login est coûteux.
+
+Pour ajouter un tracker d'une autre techno : écrire `async def _fetch_xxx(spec)` qui
+renvoie un `TrackerStat`, et l'enregistrer dans `_FETCHERS` sous sa clé de `type`.
+"""
+from __future__ import annotations
+
+import asyncio
+import re
+import time
+from dataclasses import dataclass
+
+import httpx
+
+from config import TrackerSpec, config
+
+_UA = ("Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 "
+       "(KHTML, like Gecko) Chrome/126.0 Safari/537.36")
+_CSRF_META = re.compile(r'name="csrf-token"\s+content="([^"]+)"')
+
+
+@dataclass
+class TrackerStat:
+    key: str
+    label: str
+    ok: bool
+    error: str | None = None
+    ratio: float = 0.0
+    up_bytes: int = 0
+    down_bytes: int = 0
+
+    @staticmethod
+    def _human(b: int) -> str:
+        gb = b / 1e9
+        if gb >= 1000:
+            return f"{gb / 1000:.2f}".replace(".", ",") + " To"
+        return f"{gb:.0f} Go"
+
+    @property
+    def ratio_h(self) -> str:
+        return f"{self.ratio:.2f}".replace(".", ",")
+
+    @property
+    def up_h(self) -> str:
+        return self._human(self.up_bytes)
+
+    @property
+    def down_h(self) -> str:
+        return self._human(self.down_bytes)
+
+
+# Sessions réutilisées (cookies httpx) et derniers résultats connus, par tracker.
+_sessions: dict[str, httpx.Cookies] = {}
+_cache: dict[str, dict] = {}
+
+
+class _AuthError(Exception):
+    pass
+
+
+async def _login_unit3d(client: httpx.AsyncClient, spec: TrackerSpec) -> None:
+    """Récupère le token CSRF de /login puis poste les identifiants ; les cookies de
+    session restent dans le jar du `client`."""
+    page = await client.get(f"{spec.base_url}/login")
+    m = _CSRF_META.search(page.text)
+    if not m:
+        raise _AuthError("csrf introuvable")
+    resp = await client.post(
+        f"{spec.base_url}/api/auth/login",
+        headers={"csrf-token": m.group(1), "Content-Type": "application/json"},
+        json={"username": spec.username, "password": spec.password},
+    )
+    try:
+        data = resp.json()
+    except ValueError:
+        raise _AuthError(f"login HTTP {resp.status_code}")
+    if data.get("mfaRequired"):
+        raise _AuthError("2FA requise")
+    if not data.get("success"):
+        raise _AuthError(str(data.get("message") or "login refusé"))
+
+
+async def _fetch_unit3d(spec: TrackerSpec) -> TrackerStat:
+    if not (spec.base_url and spec.username and spec.password):
+        return TrackerStat(spec.key, spec.label, ok=False, error="non configuré")
+
+    cookies = _sessions.get(spec.key) or httpx.Cookies()
+    async with httpx.AsyncClient(
+        timeout=20, follow_redirects=True, cookies=cookies,
+        headers={"User-Agent": _UA, "Accept": "application/json"},
+    ) as client:
+        url = f"{spec.base_url}/api/users/{spec.username}"
+        resp = await client.get(url)
+        data = resp.json() if resp.status_code == 200 else {}
+        if "ratio" not in data:  # session absente/expirée (route 404-masque sans auth)
+            await _login_unit3d(client, spec)
+            resp = await client.get(url)
+            if resp.status_code != 200 or "ratio" not in (data := resp.json()):
+                raise _AuthError(f"profil indisponible (HTTP {resp.status_code})")
+        _sessions[spec.key] = client.cookies
+
+    return TrackerStat(
+        spec.key, spec.label, ok=True,
+        ratio=float(data.get("ratio", 0) or 0),
+        up_bytes=int(data.get("uploaded", 0) or 0),
+        down_bytes=int(data.get("downloaded", 0) or 0),
+    )
+
+
+_FETCHERS = {"unit3d_nuxt": _fetch_unit3d}
+
+
+async def _fetch_one(spec: TrackerSpec) -> TrackerStat:
+    now = time.time()
+    cached = _cache.get(spec.key)
+    if cached and cached["value"].ok and now - cached["ts"] < config.tracker_ttl_seconds:
+        return cached["value"]
+
+    fetcher = _FETCHERS.get(spec.type)
+    if fetcher is None:
+        return TrackerStat(spec.key, spec.label, ok=False, error=f"type {spec.type} inconnu")
+
+    try:
+        value = await fetcher(spec)
+    except (_AuthError, httpx.HTTPError, ValueError) as exc:
+        _sessions.pop(spec.key, None)  # session douteuse -> repartir propre au prochain coup
+        if cached and cached["value"].ok:
+            return cached["value"]  # repli sur la dernière valeur connue
+        return TrackerStat(spec.key, spec.label, ok=False, error=str(exc) or "injoignable")
+
+    _cache[spec.key] = {"value": value, "ts": now}
+    return value
+
+
+async def fetch_all() -> list[TrackerStat]:
+    specs = config.trackers
+    if not specs:
+        return []
+    return list(await asyncio.gather(*(_fetch_one(s) for s in specs)))
diff --git a/backend/render.py b/backend/render.py
index f06bae7..c5dfd0f 100644
--- a/backend/render.py
+++ b/backend/render.py
@@ -14,7 +14,7 @@ from playwright.async_api import async_playwright
 
 from config import config
 from fonts import font_face_css
-from integrations import claude_usage, codex, homeassistant, kobo, nas, weather
+from integrations import claude_usage, codex, homeassistant, kobo, nas, trackers, weather
 
 TEMPLATES = Path(__file__).parent / "templates"
 
@@ -55,12 +55,13 @@ def _gauges(usage: claude_usage.ClaudeUsage) -> list[dict]:
 
 async def build_context() -> dict:
     """Récupère toutes les sources en parallèle et assemble le contexte du template."""
-    usage, wx, ha, nas_status, codex_status = await asyncio.gather(
+    usage, wx, ha, nas_status, codex_status, tracker_stats = await asyncio.gather(
         claude_usage.fetch_usage(),
         weather.fetch_weather(),
         homeassistant.fetch_states(),
         nas.fetch_status(),
         codex.fetch_status(),
+        trackers.fetch_all(),
     )
 
     now = datetime.now(ZoneInfo(config.timezone))
@@ -77,6 +78,7 @@ async def build_context() -> dict:
         "ha_states": ha,
         "nas": nas_status,
         "codex": codex_status,
+        "trackers": tracker_stats,
         "kobo": kobo.current(),
         "updated": now.strftime("%H:%M"),
         "stale": False,
diff --git a/backend/templates/dashboard.html b/backend/templates/dashboard.html
index 682a1db..9f78aa5 100644
--- a/backend/templates/dashboard.html
+++ b/backend/templates/dashboard.html
@@ -65,6 +65,14 @@
   .rows.grid2 .k { font-size: 28px; } .rows.grid2 .v { font-size: 32px; }
   .ko { display: inline-block; padding: 0 8px; background: var(--ink); color: var(--paper); }
 
+  /* ---- Trackers (ratio + envoi/réception du compte, sous le NAS) ---- */
+  .trk { padding: 13px 0; border-bottom: 2px solid var(--ink); }
+  .trk:last-child { border-bottom: 0; }
+  .trk .top { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; }
+  .trk .name { font-weight: 700; font-size: 31px; }
+  .trk .ratio { font-size: 46px; font-weight: 800; line-height: .9; }
+  .trk .io { font-size: 25px; font-weight: 500; margin-top: 5px; }
+
   /* ============================ JAUGE (signature) ============================
      Barre de progression intuitive : le noir se REMPLIT de gauche à droite avec la
      consommation ; le blanc à droite = budget restant. Repère ▼ = ligne d'alerte
@@ -196,6 +204,23 @@
     </div>
     {% endif %}
 
+    {% if trackers %}
+    <hr class="div">
+    <div class="label"><span class="t">Trackers</span></div>
+    <div class="rows">
+      {% for t in trackers %}
+      <div class="trk">
+        <div class="top">
+          <span class="name">{{ t.label }}</span>
+          {% if t.ok %}<span class="ratio num">{{ t.ratio_h }}</span>
+          {% else %}<span class="io"><span class="ko">{{ t.error }}</span></span>{% endif %}
+        </div>
+        {% if t.ok %}<div class="io num">envoyé {{ t.up_h }} · reçu {{ t.down_h }}</div>{% endif %}
+      </div>
+      {% endfor %}
+    </div>
+    {% endif %}
+
     {% if ha_states %}
     <hr class="div">
     <div class="label"><span class="t">Maison</span></div>
diff --git a/dev/preview.py b/dev/preview.py
index b3a13bd..0806a26 100644
--- a/dev/preview.py
+++ b/dev/preview.py
@@ -66,6 +66,11 @@ CTX = {
         "docker_running": 18, "docker_total": 19, "docker_unhealthy": 1,
         "vpn_ok": True, "vpn_port": 51820,
     },
+    "trackers": [
+        {"ok": True, "label": "c411", "ratio_h": "1,04", "up_h": "378 Go", "down_h": "365 Go"},
+        {"ok": True, "label": "torr9", "ratio_h": "0,82", "up_h": "1,21 To", "down_h": "1,47 To"},
+        {"ok": False, "label": "yggreborn", "error": "2FA requise"},
+    ],
     "ha_states": [
         {"label": "Salon", "display": "21°"},
         {"label": "Chambre", "display": "19°"},