diff --git a/.env.template b/.env.template
index a23d47b..39cc3c7 100644
--- a/.env.template
+++ b/.env.template
@@ -2,4 +2,4 @@ LLM_API_BASE_URL = "http://localhost:1234/v1"
 LLM_API_KEY = "not-relevant"
 LLM_DEFAULT_TEMPERATURE = 1.0
 
-METADATA_PREFIX = "photools:"
+METADATA_PREFIX = "photools|"
diff --git a/test/test_metadata_writer.py b/test/test_metadata_writer.py
index 48f163e..b2b96a6 100644
--- a/test/test_metadata_writer.py
+++ b/test/test_metadata_writer.py
@@ -8,8 +8,11 @@ from photools3.metadata_writer import (
     _is_prefixed,
     _prefixed,
 )
+from photools3.settings import settings
 from test.test_photo import PATHS_DNG_EXAMPLES
 
+PREFIX = settings.metadata_prefix
+
 
 @pytest.fixture
 def make_dng_file(tmp_path):
@@ -74,13 +77,13 @@ def test_get_keywords(make_dng_file, pic, expected_keywords):
 def test_prefixed():
     txt = "bla_bla"
     txt_prefixed = _prefixed(txt)
-    assert txt_prefixed == "photools|bla_bla"
+    assert txt_prefixed == f"{PREFIX}bla_bla"
 
 
 @pytest.mark.parametrize(
     "txt, expected_result",
     [
-        ("photools|some text", True),
+        (f"{PREFIX}some text", True),
         ("prefix is missing here", False),
         ("some_perfix|but not the right one", False),
     ],
@@ -108,7 +111,7 @@ def test_set_caption(make_dng_file, pic):
     assert metadata_writer.sidecar_path.exists()  # ... but now!
     result = metadata_writer.get_caption()
     assert result
-    assert result == "photools|This is a test"
+    assert result == f"{PREFIX}This is a test"
 
 
 def test_set_caption_on_existing(metadata_writer_on_existing):
@@ -120,19 +123,19 @@ def test_set_caption_on_existing(metadata_writer_on_existing):
     metadata_writer_on_existing.write_caption("Another caption")
     assert (
         metadata_writer_on_existing.get_caption()
-        == "Let's pretend this is the caption of the original image. photools|Another caption"
+        == f"Let's pretend this is the caption of the original image. {PREFIX}Another caption"
     )
 
     metadata_writer_on_existing.write_caption("Updated caption")
     assert (
         metadata_writer_on_existing.get_caption()
-        == "Let's pretend this is the caption of the original image. photools|Updated caption"
+        == f"Let's pretend this is the caption of the original image. {PREFIX}Updated caption"
     )
 
     metadata_writer_on_existing.write_caption("Don't do this!", override=False)
     assert (
         metadata_writer_on_existing.get_caption()
-        == "Let's pretend this is the caption of the original image. photools|Updated caption"
+        == f"Let's pretend this is the caption of the original image. {PREFIX}Updated caption"
     )
 
 
@@ -144,23 +147,23 @@ def test_set_caption_on_existing(metadata_writer_on_existing):
             [
                 "architektur",
                 "zeit|abend",
-                "photools|hund",
-                "photools|katze",
-                "photools|maus",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
             ],
         ),
         (
             PATHS_DNG_EXAMPLES[1],
-            ["architektur", "photools|hund", "photools|katze", "photools|maus"],
+            ["architektur", f"{PREFIX}hund", f"{PREFIX}katze", f"{PREFIX}maus"],
         ),
         (
             PATHS_DNG_EXAMPLES[2],
             [
                 "morgen",
                 "tiere|vögel",
-                "photools|hund",
-                "photools|katze",
-                "photools|maus",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
             ],
         ),
         (
@@ -173,9 +176,9 @@ def test_set_caption_on_existing(metadata_writer_on_existing):
                 "mainz",
                 "spiegelung",
                 "wasser",
-                "photools|hund",
-                "photools|katze",
-                "photools|maus",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
             ],
         ),
         (
@@ -187,9 +190,9 @@ def test_set_caption_on_existing(metadata_writer_on_existing):
                 "personen",
                 "tiefe",
                 "weg",
-                "photools|hund",
-                "photools|katze",
-                "photools|maus",
+                f"{PREFIX}hund",
+                f"{PREFIX}katze",
+                f"{PREFIX}maus",
             ],
         ),
     ],
@@ -200,9 +203,9 @@ def test_set_keywords(make_dng_file, pic, expected_keywords):
     result = metadata_writer.get_keywords()
     assert result
     assert isinstance(result, list)
-    assert "photools|hund" in result
-    assert "photools|katze" in result
-    assert "photools|maus" in result
+    assert f"{PREFIX}hund" in result
+    assert f"{PREFIX}katze" in result
+    assert f"{PREFIX}maus" in result
 
 
 def test_set_keywords_on_existing():