diff --git a/hosts/server/configuration.nix b/hosts/server/configuration.nix
index e5ef7f83..b82800bb 100644
--- a/hosts/server/configuration.nix
+++ b/hosts/server/configuration.nix
@@ -25,6 +25,7 @@
     ../../server-modules/signal-cli-rest-api.nix
     ../../server-modules/home-assistant
     ../../server-modules/miniflux.nix
+    ../../server-modules/uptime-kuma.nix
 
     # You should let those lines as is
     ./hardware-configuration.nix
diff --git a/server-modules/home-assistant/default.nix b/server-modules/home-assistant/default.nix
index ceee3ce4..f003814d 100644
--- a/server-modules/home-assistant/default.nix
+++ b/server-modules/home-assistant/default.nix
@@ -53,6 +53,7 @@ in {
       "meteo_france"
       "remote_calendar"
       "systemmonitor"
+      "uptime_kuma"
     ];
     customComponents = plugins.customComponents;
     customLovelaceModules = plugins.customLovelaceModules;
@@ -65,7 +66,11 @@ in {
       scene = "!include scenes.yaml";
       automation = "!include automations.yaml";
       script = "!include scripts.yaml";
-      frontend.themes = nixyTheme;
+      frontend = {
+        themes = nixyTheme;
+        # Load card-mod early so it can style every card
+        extra_module_url = ["/local/nixos-lovelace-modules/card-mod.js"];
+      };
       # Timestamp of the last motion detection (trigger-based, survives restarts)
       template =
         map (room: {
@@ -86,7 +91,61 @@ in {
             }
           ];
         })
-        motionRooms;
+        motionRooms
+        ++ [
+          # Uptime Kuma monitors that are not up (down, pending or maintenance)
+          {
+            sensor = [
+              {
+                name = "Websites not up";
+                unique_id = "websites_not_up";
+                icon = "mdi:web-off";
+                state = ''
+                  {{ integration_entities('uptime_kuma')
+                     | select('match', 'sensor\.')
+                     | select('is_state', ['down', 'pending', 'maintenance'])
+                     | list | count }}
+                '';
+                attributes.sites = ''
+                  {{ integration_entities('uptime_kuma')
+                     | select('match', 'sensor\.')
+                     | select('is_state', ['down', 'pending', 'maintenance'])
+                     | map('device_attr', 'name')
+                     | list }}
+                '';
+              }
+            ];
+          }
+          # Battery sensors below 15%
+          {
+            sensor = [
+              {
+                name = "Batteries to replace";
+                unique_id = "batteries_to_replace";
+                icon = "mdi:battery-alert-variant-outline";
+                state = ''
+                  {{ states.sensor
+                     | selectattr('attributes.device_class', 'defined')
+                     | selectattr('attributes.device_class', 'eq', 'battery')
+                     | map(attribute='state')
+                     | select('is_number') | map('float')
+                     | select('lt', 15)
+                     | list | count }}
+                '';
+                attributes.devices = ''
+                  {% set ns = namespace(low=[]) %}
+                  {% for s in states.sensor
+                       | selectattr('attributes.device_class', 'defined')
+                       | selectattr('attributes.device_class', 'eq', 'battery')
+                       if is_number(s.state) and s.state | float < 15 %}
+                    {% set ns.low = ns.low + [s.name ~ ' (' ~ s.state | int ~ '%)'] %}
+                  {% endfor %}
+                  {{ ns.low }}
+                '';
+              }
+            ];
+          }
+        ];
       alarm_control_panel = [
         {
           platform = "manual";
diff --git a/server-modules/home-assistant/plugins.nix b/server-modules/home-assistant/plugins.nix
index 4f321c81..6a57f321 100644
--- a/server-modules/home-assistant/plugins.nix
+++ b/server-modules/home-assistant/plugins.nix
@@ -64,5 +64,6 @@ in {
     pkgs.home-assistant-custom-lovelace-modules.bubble-card
     pkgs.home-assistant-custom-lovelace-modules.auto-entities
     pkgs.home-assistant-custom-lovelace-modules.mushroom
+    pkgs.home-assistant-custom-lovelace-modules.card-mod
   ];
 }
diff --git a/server-modules/uptime-kuma.nix b/server-modules/uptime-kuma.nix
new file mode 100644
index 00000000..6c224452
--- /dev/null
+++ b/server-modules/uptime-kuma.nix
@@ -0,0 +1,29 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (import ./mk-container.nix {inherit lib config;}) mkContainer;
+in {
+  imports = [
+    (mkContainer {
+      name = "uptime-kuma";
+      hostIp = "10.233.13.1";
+      containerIp = "10.233.13.2";
+      internet = true;
+      nixosConfig = {...}: {
+        services.uptime-kuma = {
+          enable = true;
+          settings = {
+            HOST = "0.0.0.0";
+            PORT = "3001";
+          };
+        };
+        networking.firewall.allowedTCPPorts = [3001];
+        system.stateVersion = "24.05";
+      };
+    })
+  ];
+
+  services.cloudflared.tunnels."${config.var.tunnelId}".ingress."uptime.${config.var.domain}" = "http://10.233.13.2:3001";
+}