diff --git a/tcllib/devlist.py b/tcllib/devlist.py
index 8890478..d1dc0d1 100644
--- a/tcllib/devlist.py
+++ b/tcllib/devlist.py
@@ -19,7 +19,7 @@ DEVICELIST_FILE = "prds.json"
 DEVICELIST_CACHE_SECONDS = 86400
 
 
-def load_local_devicelist():
+def _load_local_devicelist():
     """Load local devicelist and return decoded JSON (or None) and need_download status."""
     need_download = True
     try:
@@ -32,19 +32,15 @@ def load_local_devicelist():
     except FileNotFoundError:
         return None, True
 
-
-def get_devicelist(force: bool=False, output_diff: bool=True, local: bool=False) -> dict:
-    """Return device list from saved database."""
-    old_prds, need_download = load_local_devicelist()
-
-    if local:
-        return old_prds
-
-    if need_download or force:
+def _download_devicelist(doit: bool):
+    """Download device list if doit is set. Or do nothing."""
+    if doit:
         prds_json = requests.get(DEVICELIST_URL).text
         with open(DEVICELIST_FILE, "wt") as dlfile:
             dlfile.write(prds_json)
 
+def _load_devicelist_with_diff(output_diff: bool, old_prds: dict = {}) -> dict:
+    """Load local devicelist and output diff if requested."""
     with open(DEVICELIST_FILE, "rt") as dlfile:
         prds = json.load(dlfile)
 
@@ -53,6 +49,17 @@ def get_devicelist(force: bool=False, output_diff: bool=True, local: bool=False)
 
     return prds
 
+def get_devicelist(force: bool=False, output_diff: bool=True, local: bool=False) -> dict:
+    """Return device list from saved database."""
+    old_prds, need_download = _load_local_devicelist()
+
+    if local:
+        return old_prds
+
+    _download_devicelist(need_download or force)
+
+    return _load_devicelist_with_diff(output_diff, old_prds)
+
 
 def print_versions_diff(old_data: dict, new_data: dict):
     """Print version changes between old and new databases."""
@@ -70,17 +77,17 @@ def print_versions_diff(old_data: dict, new_data: dict):
     elif new_data["last_ota"] != old_data["last_ota"]:
         print("> {}: {} ⇨ {} (OTA)".format(prd, ansi.YELLOW_DARK + str(old_data["last_ota"]) + ansi.RESET, ansi.YELLOW + str(new_data["last_ota"]) + ansi.RESET))
 
-def print_removed_prds(prds_data: dict, removed_prds: list):
+def _print_removed_prds(prds_data: dict, removed_prds: list):
     """Print details of selected PRDs as removed."""
     for prd in removed_prds:
         print("> Removed device {} (was at {} / OTA: {}).".format(ansi.RED + prd + ansi.RESET, prds_data[prd]["last_full"], prds_data[prd]["last_ota"]))
 
-def print_added_prds(prds_data: dict, added_prds: list):
+def _print_added_prds(prds_data: dict, added_prds: list):
     """Print details of selected PRDs as added."""
     for prd in added_prds:
         print("> New device {} ({} / OTA: {}).".format(ansi.GREEN + prd + ansi.RESET, prds_data[prd]["last_full"], prds_data[prd]["last_ota"]))
 
-def print_changed_prds(old_prds: dict, new_prds: dict, skip_prds: list):
+def _print_changed_prds(old_prds: dict, new_prds: dict, skip_prds: list):
     """Print details of changed PRDs."""
     for prd, pdata in new_prds.items():
         if prd in skip_prds:
@@ -92,6 +99,6 @@ def print_prd_diff(old_prds: dict, new_prds: dict):
     """Print PRD changes between old and new databases."""
     added_prds = [prd for prd in new_prds if prd not in old_prds]
     removed_prds = [prd for prd in old_prds if prd not in new_prds]
-    print_removed_prds(old_prds, removed_prds)
-    print_added_prds(new_prds, added_prds)
-    print_changed_prds(old_prds, new_prds, added_prds)
+    _print_removed_prds(old_prds, removed_prds)
+    _print_added_prds(new_prds, added_prds)
+    _print_changed_prds(old_prds, new_prds, added_prds)