diff --git a/ereuse_devicehub/messages.py b/ereuse_devicehub/messages.py
new file mode 100644
index 00000000..29412060
--- /dev/null
+++ b/ereuse_devicehub/messages.py
@@ -0,0 +1,68 @@
+from audioop import add
+from curses import ERR
+from flask import session
+
+
+DEBUG = 10
+INFO = 20
+SUCCESS = 25
+WARNING = 30
+ERROR = 40
+
+DEFAULT_LEVELS = {
+    'DEBUG': DEBUG,
+    'INFO': INFO,
+    'SUCCESS': SUCCESS,
+    'WARNING': WARNING,
+    'ERROR': ERROR,
+}
+
+DEFAULT_TAGS = {
+    DEBUG: 'light',
+    INFO: 'info',
+    SUCCESS: 'success',
+    WARNING: 'warning',
+    ERROR: 'danger',
+}
+
+DEFAULT_ICONS = {
+    DEBUG: 'tools',
+    INFO: 'info-circle',
+    SUCCESS: 'check-circle',
+    WARNING: 'exclamation-triangle',
+    ERROR: 'exclamation-octagon',
+}
+
+
+def add_message(level, message):
+    messages = session.get('_messages', [])
+
+    icon = DEFAULT_ICONS[level]
+    level_tag = DEFAULT_TAGS[level]
+
+    messages.append({'level': level_tag, 'icon': icon, 'content': message})
+
+
+def debug(message):
+    """Add a message with the ``DEBUG`` level."""
+    add_message(DEBUG, message)
+
+
+def info(message):
+    """Add a message with the ``INFO`` level."""
+    add_message(INFO, message)
+
+
+def success(message):
+    """Add a message with the ``SUCCESS`` level."""
+    add_message(SUCCESS, message)
+
+
+def warning(message):
+    """Add a message with the ``WARNING`` level."""
+    add_message(WARNING, message)
+
+
+def error(message):
+    """Add a message with the ``ERROR`` level."""
+    add_message(ERROR, message)