diff --git a/importarr/main.py b/importarr/main.py
index 897a8d2..10e3ef2 100644
--- a/importarr/main.py
+++ b/importarr/main.py
@@ -41,6 +41,25 @@ class QueueItemActionRequest(BaseModel):
     action: str
 
 
+class AppSettingsUpdate(BaseModel):
+    sab_url: str
+    sab_api_key: str | None = None
+    radarr_url: str | None = None
+    radarr_api_key: str | None = None
+    sonarr_url: str | None = None
+    sonarr_api_key: str | None = None
+
+
+def load_ui_settings() -> None:
+    for key in ("sab_url", "sab_api_key", "radarr_url", "radarr_api_key", "sonarr_url", "sonarr_api_key"):
+        stored = state.get_app_state(key)
+        if stored is not None:
+            setattr(settings, key, stored or None)
+
+
+load_ui_settings()
+
+
 def require_write_auth(authorization: Annotated[str | None, Header()] = None) -> None:
     if not settings.auth_token:
         return
@@ -70,6 +89,11 @@ def status() -> dict[str, object]:
         "movies_root": str(settings.movies_root),
         "tv_root": str(settings.tv_root),
         "sab_url": settings.sab_url,
+        "sab_api_key_configured": bool(settings.sab_api_key),
+        "radarr_url": settings.radarr_url or "",
+        "radarr_api_key_configured": bool(settings.radarr_api_key),
+        "sonarr_url": settings.sonarr_url or "",
+        "sonarr_api_key_configured": bool(settings.sonarr_api_key),
         "auth_enabled": bool(settings.auth_token),
         "bind": f"{settings.bind_host}:{settings.bind_port}",
         "manual_batches": len(state.list_manual_batches(active_only=True)),
@@ -80,6 +104,38 @@ def status() -> dict[str, object]:
     }
 
 
+@app.get("/api/settings")
+def get_ui_settings() -> dict[str, object]:
+    return {
+        "sab_url": settings.sab_url,
+        "sab_api_key_configured": bool(settings.sab_api_key),
+        "radarr_url": settings.radarr_url or "",
+        "radarr_api_key_configured": bool(settings.radarr_api_key),
+        "sonarr_url": settings.sonarr_url or "",
+        "sonarr_api_key_configured": bool(settings.sonarr_api_key),
+    }
+
+
+@app.post("/api/settings")
+def update_ui_settings(payload: AppSettingsUpdate, _: None = Depends(require_write_auth)) -> dict[str, object]:
+    sab_url = payload.sab_url.strip()
+    if not sab_url:
+        raise HTTPException(status_code=400, detail="SAB URL is required")
+    values = {
+        "sab_url": sab_url,
+        "sab_api_key": (payload.sab_api_key or "").strip(),
+        "radarr_url": (payload.radarr_url or "").strip(),
+        "radarr_api_key": (payload.radarr_api_key or "").strip(),
+        "sonarr_url": (payload.sonarr_url or "").strip(),
+        "sonarr_api_key": (payload.sonarr_api_key or "").strip(),
+    }
+    for key, value in values.items():
+        state.set_app_state(key, value)
+        setattr(settings, key, value or None)
+    settings.sab_url = sab_url
+    return get_ui_settings()
+
+
 def control_status() -> dict[str, object]:
     mode = state.get_app_state("queue_mode", "running") or "running"
     current = state.get_app_state("current_job")
diff --git a/importarr/static/importarr.css b/importarr/static/importarr.css
index 2a4e44e..04fc320 100644
--- a/importarr/static/importarr.css
+++ b/importarr/static/importarr.css
@@ -1 +1 @@
-body{font-family:system-ui,sans-serif;margin:0;background:#111827;color:#e5e7eb}header,main{max-width:1100px;margin:auto;padding:1rem}.topbar{display:flex;justify-content:space-between;gap:1rem;align-items:center;background:#0f172a}.build{text-align:right}.build strong{font-size:1.2rem}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(12rem,1fr));gap:1rem}.cards article,.panel{background:#1f2937;border-radius:.75rem;padding:1rem;margin-top:1rem}strong{display:block;font-size:2rem}span,small,dd{color:#9ca3af}table{width:100%;border-collapse:collapse;background:#1f2937;margin-top:1rem}th,td{padding:.6rem;border-bottom:1px solid #374151;text-align:left;vertical-align:top}input,button{padding:.6rem;border-radius:.4rem;border:1px solid #374151}button{background:#38bdf8;color:#082f49;font-weight:700;cursor:pointer}.danger{background:#f87171;color:#450a0a}.warn{background:#fbbf24;color:#451a03}.controls,.row-actions{display:flex;gap:.5rem;flex-wrap:wrap}.inline-form{display:flex;gap:.5rem;flex-wrap:wrap}.inline-form input[name=path]{min-width:min(100%,28rem);flex:1}.info{display:grid;grid-template-columns:10rem 1fr;gap:.4rem 1rem}.info dt{font-weight:700}.info dd{margin:0;overflow-wrap:anywhere}.state{background:#0f172a;border:1px solid #374151;border-radius:999px;padding:.15rem .5rem;display:inline-block}.section-title{display:flex;align-items:center;justify-content:space-between;gap:1rem}.job-group{margin-top:1.25rem}.job-group h3{display:flex;gap:.5rem;align-items:center}.job-group h3 span{font-size:.9rem;border:1px solid #374151;border-radius:999px;padding:.1rem .45rem}.file-name{font-size:1rem}.row-actions button{padding:.35rem .5rem}td small{display:block;overflow-wrap:anywhere}
+body{font-family:system-ui,sans-serif;margin:0;background:#111827;color:#e5e7eb}header,main{max-width:1100px;margin:auto;padding:1rem}.topbar{display:flex;justify-content:space-between;gap:1rem;align-items:center;background:#0f172a}.build{text-align:right}.build strong{font-size:1.2rem}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(12rem,1fr));gap:1rem}.cards article,.panel{background:#1f2937;border-radius:.75rem;padding:1rem;margin-top:1rem}strong{display:block;font-size:2rem}span,small,dd{color:#9ca3af}table{width:100%;border-collapse:collapse;background:#1f2937;margin-top:1rem}th,td{padding:.6rem;border-bottom:1px solid #374151;text-align:left;vertical-align:top}input,button{padding:.6rem;border-radius:.4rem;border:1px solid #374151}button{background:#38bdf8;color:#082f49;font-weight:700;cursor:pointer}.danger{background:#f87171;color:#450a0a}.warn{background:#fbbf24;color:#451a03}.controls,.row-actions{display:flex;gap:.5rem;flex-wrap:wrap}.inline-form{display:flex;gap:.5rem;flex-wrap:wrap}.inline-form input[name=path]{min-width:min(100%,28rem);flex:1}.info{display:grid;grid-template-columns:10rem 1fr;gap:.4rem 1rem}.info dt{font-weight:700}.info dd{margin:0;overflow-wrap:anywhere}.state{background:#0f172a;border:1px solid #374151;border-radius:999px;padding:.15rem .5rem;display:inline-block}.section-title{display:flex;align-items:center;justify-content:space-between;gap:1rem}.job-group{margin-top:1.25rem}.job-group h3{display:flex;gap:.5rem;align-items:center}.job-group h3 span{font-size:.9rem;border:1px solid #374151;border-radius:999px;padding:.1rem .45rem}.file-name{font-size:1rem}.row-actions button{padding:.35rem .5rem}td small{display:block;overflow-wrap:anywhere}dialog{background:#1f2937;color:#e5e7eb;border:1px solid #374151;border-radius:.75rem;max-width:min(42rem,90vw)}dialog::backdrop{background:#0009}fieldset{border:1px solid #374151;border-radius:.5rem;margin:1rem 0;padding:1rem}label{display:grid;gap:.35rem;margin:.75rem 0}.hint{color:#9ca3af}
diff --git a/importarr/templates/index.html b/importarr/templates/index.html
index 4076bd6..e9bebba 100644
--- a/importarr/templates/index.html
+++ b/importarr/templates/index.html
@@ -9,7 +9,7 @@
 <body>
   <header class="topbar">
     <div><h1>Importarr</h1><p>Manual SABnzbd imports, safely gated by SAB completion.</p></div>
-    <div class="build"><strong>{{ status.build.version }}</strong><span>{{ status.build.git_sha[:12] }} · {{ status.build.build_date }}</span></div>
+    <div class="build"><strong>{{ status.build.version }}</strong><span>{{ status.build.git_sha[:12] }} · {{ status.build.build_date }}</span><button type="button" id="open-settings">Settings</button></div>
   </header>
   <main>
     <section class="cards">
@@ -28,6 +28,9 @@
         <dt>Started</dt><dd>{{ status.build.started_at }}</dd>
         <dt>Python</dt><dd>{{ status.build.python }}</dd>
         <dt>SAB URL</dt><dd>{{ status.sab_url }}</dd>
+        <dt>SAB API token</dt><dd id="sab-token-status">{{ 'configured' if status.sab_api_key_configured else 'not configured' }}</dd>
+        <dt>Radarr</dt><dd>{{ status.radarr_url or 'not configured' }}</dd>
+        <dt>Sonarr</dt><dd>{{ status.sonarr_url or 'not configured' }}</dd>
         <dt>Download root</dt><dd>{{ status.download_root }}</dd>
         <dt>Movies root</dt><dd>{{ status.movies_root }}</dd>
         <dt>TV root</dt><dd>{{ status.tv_root }}</dd>
@@ -64,6 +67,28 @@
       <div id="jobs">Loading…</div>
     </section>
   </main>
+  <dialog id="settings-dialog">
+    <form id="settings-form" method="dialog">
+      <div class="section-title"><h2>Settings</h2><button type="button" id="close-settings">Close</button></div>
+      <fieldset>
+        <legend>SABnzbd</legend>
+        <label>SAB URL <input name="sab_url" type="url" value="{{ status.sab_url }}" placeholder="http://sabnzbd:8080" required></label>
+        <label>API token <input name="sab_api_key" type="password" placeholder="{% if status.sab_api_key_configured %}Configured; enter a new token to replace{% else %}SAB API token{% endif %}" autocomplete="off"></label>
+      </fieldset>
+      <fieldset>
+        <legend>Radarr</legend>
+        <label>Radarr URL <input name="radarr_url" type="url" value="{{ status.radarr_url }}" placeholder="http://radarr:7878"></label>
+        <label>API token <input name="radarr_api_key" type="password" placeholder="{% if status.radarr_api_key_configured %}Configured; enter a new token to replace{% else %}Radarr API token{% endif %}" autocomplete="off"></label>
+      </fieldset>
+      <fieldset>
+        <legend>Sonarr</legend>
+        <label>Sonarr URL <input name="sonarr_url" type="url" value="{{ status.sonarr_url }}" placeholder="http://sonarr:8989"></label>
+        <label>API token <input name="sonarr_api_key" type="password" placeholder="{% if status.sonarr_api_key_configured %}Configured; enter a new token to replace{% else %}Sonarr API token{% endif %}" autocomplete="off"></label>
+      </fieldset>
+      <p class="hint">Blank token fields clear the stored token. Environment values remain the startup defaults until saved here.</p>
+      <button type="submit">Save settings</button>
+    </form>
+  </dialog>
   <script>
   const esc=value=>String(value??'').replace(/[&<>"']/g,ch=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[ch]));
   async function postJson(url, body){ const response=await fetch(url,{method:'POST',headers:{'content-type':'application/json'},body:body?JSON.stringify(body):undefined}); if(!response.ok){ const error=await response.json().catch(()=>({detail:response.statusText})); alert(error.detail||'Request failed'); } return response; }
@@ -75,6 +100,9 @@
   document.getElementById('browse-batch').addEventListener('click',()=>document.getElementById('batch-picker').click());
   document.getElementById('batch-picker').addEventListener('change',e=>{ const f=e.target.files[0]; if(!f)return; const top=(f.webkitRelativePath||'').split('/')[0]; if(top) document.querySelector('#batch-form [name="path"]').value=top; });
   document.getElementById('batch-form').addEventListener('submit', async e=>{ e.preventDefault(); const response=await postJson('/api/manual-batches',{path:e.target.path.value}); if(response.ok) location.reload(); });
+  document.getElementById('open-settings').addEventListener('click',()=>document.getElementById('settings-dialog').showModal());
+  document.getElementById('close-settings').addEventListener('click',()=>document.getElementById('settings-dialog').close());
+  document.getElementById('settings-form').addEventListener('submit', async e=>{ e.preventDefault(); const body=Object.fromEntries(new FormData(e.target)); const response=await postJson('/api/settings',body); if(response.ok){ const data=await response.json(); document.getElementById('sab-token-status').textContent=data.sab_api_key_configured?'configured':'not configured'; ['sab_api_key','radarr_api_key','sonarr_api_key'].forEach(name=>e.target.elements[name].value=''); document.getElementById('settings-dialog').close(); } });
   document.getElementById('force-run').addEventListener('click', async()=>{ await postJson('/api/import/run-now',{force:true}); await refresh(); });
   refresh(); setInterval(refresh, 10000);
   </script>
diff --git a/tests/test_status.py b/tests/test_status.py
index d043441..9fe6549 100644
--- a/tests/test_status.py
+++ b/tests/test_status.py
@@ -31,3 +31,49 @@ def test_index_renders_queue_controls(tmp_path, monkeypatch):
     assert response.status_code == 200
     assert "Queue controls" in response.text
     assert "cancel-current" in response.text
+
+
+def test_index_renders_settings_dialog(tmp_path, monkeypatch):
+    monkeypatch.setenv("IMPORTARR_STATE_PATH", str(tmp_path / "state.db"))
+    import importarr.main as main
+
+    from fastapi.testclient import TestClient
+
+    response = TestClient(main.app).get("/")
+
+    assert response.status_code == 200
+    assert "settings-dialog" in response.text
+    assert "SABnzbd" in response.text
+    assert "Radarr" in response.text
+    assert "Sonarr" in response.text
+
+
+def test_settings_endpoint_persists_arr_connection_values(tmp_path, monkeypatch):
+    monkeypatch.setenv("IMPORTARR_STATE_PATH", str(tmp_path / "state.db"))
+    import importarr.main as main
+
+    from fastapi.testclient import TestClient
+
+    response = TestClient(main.app).post(
+        "/api/settings",
+        json={
+            "sab_url": "http://sab:8080",
+            "sab_api_key": "sab-secret",
+            "radarr_url": "http://radarr:7878",
+            "radarr_api_key": "radarr-secret",
+            "sonarr_url": "http://sonarr:8989",
+            "sonarr_api_key": "sonarr-secret",
+        },
+    )
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "sab_url": "http://sab:8080",
+        "sab_api_key_configured": True,
+        "radarr_url": "http://radarr:7878",
+        "radarr_api_key_configured": True,
+        "sonarr_url": "http://sonarr:8989",
+        "sonarr_api_key_configured": True,
+    }
+    assert main.settings.sab_api_key == "sab-secret"
+    assert main.state.get_app_state("radarr_api_key") == "radarr-secret"