diff --git a/apps/README.md b/apps/README.md
index 9f8e1ec..353f9e2 100644
--- a/apps/README.md
+++ b/apps/README.md
@@ -150,6 +150,7 @@ services:
       #
       # App specific environment variables
       # $APP_HIDDEN_SERVICE - The address of the Tor hidden service your app will be exposed at
+      # $APP_DOMAIN - Local domain name of the app ("umbrel.local" on Umbrel OS)
   # If your app has more services, like a database container, you can define those
   # services below:
   # db:
diff --git a/scripts/app b/scripts/app
index 16f32fb..0a91903 100755
--- a/scripts/app
+++ b/scripts/app
@@ -106,12 +106,14 @@ compose() {
   local env_file="${UMBREL_ROOT}/.env"
   local app_base_compose_file="${UMBREL_ROOT}/apps/docker-compose.common.yml"
   local app_compose_file="${app_dir}/docker-compose.yml"
+  local app_domain="$(hostname -s 2>/dev/null || echo "umbrel").local"
   local app_hidden_servive_file="${UMBREL_ROOT}/tor/data/app-${app}/hostname"
   local app_entropy_identifier="app-${app}-seed"
 
   export BITCOIN_DATA_DIR="${UMBREL_ROOT}/bitcoin"
   export LND_DATA_DIR="${UMBREL_ROOT}/lnd"
   export APP_DATA_DIR="${app_data_dir}"
+  export APP_DOMAIN="${app_domain}"
   export APP_HIDDEN_SERVICE="$(cat "${app_hidden_servive_file}" 2>/dev/null || echo "notyetset.onion")"
   export APP_SEED=$(derive_entropy "${app_entropy_identifier}")