diff --git a/auditui/constants.py b/auditui/constants.py
new file mode 100644
index 0000000..49c7dcd
--- /dev/null
+++ b/auditui/constants.py
@@ -0,0 +1,23 @@
+"""Shared constants for the Auditui application."""
+
+from pathlib import Path
+
+AUTH_PATH = Path.home() / ".config" / "auditui" / "auth.json"
+CACHE_DIR = Path.home() / ".cache" / "auditui" / "books"
+DOWNLOAD_URL = "https://cde-ta-g7g.amazon.com/FionaCDEServiceEngine/FSDownloadContent"
+DEFAULT_CODEC = "LC_128_44100_stereo"
+MIN_FILE_SIZE = 1024 * 1024
+
+TABLE_COLUMNS = ("Title", "Author", "Length", "Progress")
+
+TABLE_CSS = """
+DataTable {
+    height: 1fr;
+}
+Static {
+    height: 1;
+    text-align: center;
+    background: $primary;
+}
+"""
+