diff --git a/.claude/settings.local.json b/.claude/settings.local.json
new file mode 100644
index 0000000..debae5f
--- /dev/null
+++ b/.claude/settings.local.json
@@ -0,0 +1,9 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(gleam build:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}
\ No newline at end of file
diff --git a/src/g18n/dev.gleam b/src/g18n/dev.gleam
index 3dca8ef..3936045 100644
--- a/src/g18n/dev.gleam
+++ b/src/g18n/dev.gleam
@@ -1,6 +1,7 @@
 import argv
 import filepath
 import g18n
+import g18n/locale
 import gleam/bool
 import gleam/dict
 import gleam/io
@@ -20,6 +21,8 @@ import trie
 /// gleam run generate          # Generate from flat JSON files  
 /// gleam run generate --nested # Generate from nested JSON files
 /// gleam run generate -- po    # Generate from PO files
+/// gleam run report            # Show translation report
+/// gleam run report --primary <locale> # Set primary locale for comparison
 /// gleam run help              # Show help
 /// gleam run                   # Show help (default)
 /// ```
@@ -28,6 +31,8 @@ pub fn main() {
     ["generate"] -> generate_command()
     ["generate", "--nested"] -> generate_nested_command()
     ["generate", "--po"] -> generate_po_command()
+    ["report"] -> report_command("")
+    ["report", "--primary", locale] -> report_command(locale)
     ["help"] -> help_command()
     [] -> help_command()
     _ -> {
@@ -66,6 +71,13 @@ fn generate_po_command() {
   }
 }
 
+fn report_command(primary_locale: String) {
+  case generate_translation_report(primary_locale) {
+    Ok(_) -> Nil
+    Error(msg) -> io.println_error(snag.pretty_print(msg))
+  }
+}
+
 fn help_command() {
   io.println("g18n CLI - Internationalization for Gleam")
   io.println("")
@@ -77,6 +89,8 @@ fn help_command() {
   io.println(
     "  generate --po      Generate Gleam module from PO files (gettext)",
   )
+  io.println("  report             Show translation coverage report")
+  io.println("  report --primary <locale> Set primary locale for comparison")
   io.println("  help               Show this help message")
   io.println("")
   io.println("Flat JSON usage:")
@@ -136,6 +150,58 @@ fn generate_po_translations() -> SnagResult(String) {
   Ok(output_path)
 }
 
+fn generate_translation_report(primary_locale: String) -> SnagResult(Nil) {
+  use project_name <- result.try(get_project_name())
+  use locale_files <- result.try(find_locale_files(project_name))
+  use locale_data <- result.try(load_all_locales(locale_files))
+  
+  // Determine primary locale
+  let primary = case primary_locale {
+    "" -> {
+      case locale_data {
+        [first, ..] -> first.0
+        [] -> "en"
+      }
+    }
+    locale -> locale
+  }
+  
+  // Find primary locale data
+  case list.find(locale_data, fn(pair) { pair.0 == primary }) {
+    Ok(#(_, primary_translations)) -> {
+      io.println("📊 Translation Validation Report")
+      io.println("Primary locale: " <> primary)
+      io.println("")
+      
+      // Generate reports for each locale compared to primary
+      list.each(locale_data, fn(pair) {
+        let #(locale_code, translations) = pair
+        
+        // Create locale for validation
+        case locale.new(string.replace(locale_code, each: "_", with: "-")) {
+          Ok(target_locale) -> {
+            let report = g18n.validate_translations(primary_translations, translations, target_locale)
+            io.println("🌍 " <> locale_code <> ":")
+            io.println(g18n.export_validation_report(report))
+            io.println("")
+          }
+          Error(_) -> {
+            io.println("❌ Invalid locale code: " <> locale_code)
+            io.println("")
+          }
+        }
+      })
+      
+      Ok(Nil)
+    }
+    Error(_) -> {
+      io.println("❌ Primary locale '" <> primary <> "' not found!")
+      io.println("Available locales: " <> string.join(list.map(locale_data, fn(pair) { pair.0 }), ", "))
+      snag.error("Primary locale not found")
+    }
+  }
+}
+
 fn format() {
   shellout.command("gleam", ["format"], in: find_root("."), opt: [])
   |> snag.map_error(fn(_) { "Could not format generated file" })
diff --git a/src/g18n_dev/translations/de.json b/src/g18n_dev/translations/de.json
new file mode 100644
index 0000000..29e0915
--- /dev/null
+++ b/src/g18n_dev/translations/de.json
@@ -0,0 +1,18 @@
+{
+  "app.title": "Meine Anwendung",
+  "app.description": "Eine Beispielanwendung zum Testen von Übersetzungen",
+  "nav.home": "Startseite",
+  "nav.about": "Über uns",
+  "nav.contact": "Kontakt",
+  "user.login": "Anmelden",
+  "user.logout": "Abmelden",
+  "user.profile": "Profil",
+  "user.settings": "Einstellungen",
+  "messages.welcome": "Willkommen in unserer App!",
+  "messages.goodbye": "Danke, dass Sie unsere App nutzen!",
+  "errors.not_found": "Seite nicht gefunden",
+  "errors.server_error": "Interner Serverfehler",
+  "buttons.save": "Speichern",
+  "buttons.cancel": "Abbrechen",
+  "buttons.delete": "Löschen"
+}
\ No newline at end of file
diff --git a/src/g18n_dev/translations/en.json b/src/g18n_dev/translations/en.json
new file mode 100644
index 0000000..354eabe
--- /dev/null
+++ b/src/g18n_dev/translations/en.json
@@ -0,0 +1,18 @@
+{
+  "app.title": "My Application",
+  "app.description": "A sample application for testing translations",
+  "nav.home": "Home",
+  "nav.about": "About",
+  "nav.contact": "Contact",
+  "user.login": "Login",
+  "user.logout": "Logout",
+  "user.profile": "Profile",
+  "user.settings": "Settings",
+  "messages.welcome": "Welcome to our app!",
+  "messages.goodbye": "Thanks for using our app!",
+  "errors.not_found": "Page not found",
+  "errors.server_error": "Internal server error",
+  "buttons.save": "Save",
+  "buttons.cancel": "Cancel",
+  "buttons.delete": "Delete"
+}
\ No newline at end of file
diff --git a/src/g18n_dev/translations/es.json b/src/g18n_dev/translations/es.json
new file mode 100644
index 0000000..78b1c1e
--- /dev/null
+++ b/src/g18n_dev/translations/es.json
@@ -0,0 +1,15 @@
+{
+  "app.title": "Mi Aplicación",
+  "app.description": "Una aplicación de ejemplo para probar traducciones",
+  "nav.home": "Inicio",
+  "nav.about": "Acerca de",
+  "nav.contact": "Contacto",
+  "user.login": "Iniciar sesión",
+  "user.logout": "Cerrar sesión",
+  "user.profile": "Perfil",
+  "messages.welcome": "¡Bienvenido a nuestra aplicación!",
+  "messages.goodbye": "¡Gracias por usar nuestra aplicación!",
+  "errors.not_found": "Página no encontrada",
+  "buttons.save": "Guardar",
+  "buttons.cancel": "Cancelar"
+}
\ No newline at end of file
diff --git a/src/g18n_dev/translations/fr.json b/src/g18n_dev/translations/fr.json
new file mode 100644
index 0000000..89cea60
--- /dev/null
+++ b/src/g18n_dev/translations/fr.json
@@ -0,0 +1,10 @@
+{
+  "app.title": "Mon Application",
+  "nav.home": "Accueil",
+  "nav.about": "À propos",
+  "user.login": "Connexion",
+  "user.logout": "Déconnexion",
+  "messages.welcome": "Bienvenue dans notre application!",
+  "errors.not_found": "Page non trouvée",
+  "buttons.save": "Enregistrer"
+}
\ No newline at end of file