diff --git a/.changepacks/changepack_log_2zpAg1mt6UJkXYIaDgFBc.json b/.changepacks/changepack_log_2zpAg1mt6UJkXYIaDgFBc.json
new file mode 100644
index 0000000..35464fb
--- /dev/null
+++ b/.changepacks/changepack_log_2zpAg1mt6UJkXYIaDgFBc.json
@@ -0,0 +1 @@
+{"changes":{"crates/vespertide-config/Cargo.toml":"Patch","crates/vespertide-cli/Cargo.toml":"Patch","crates/vespertide-macro/Cargo.toml":"Patch","crates/vespertide-loader/Cargo.toml":"Patch","crates/vespertide/Cargo.toml":"Patch","crates/vespertide-query/Cargo.toml":"Patch","crates/vespertide-exporter/Cargo.toml":"Patch","crates/vespertide-core/Cargo.toml":"Patch","crates/vespertide-planner/Cargo.toml":"Patch","crates/vespertide-naming/Cargo.toml":"Patch"},"note":"Add vespertide postfix","date":"2026-01-06T18:05:49.242282600Z"}
\ No newline at end of file
diff --git a/crates/vespertide-cli/src/commands/new.rs b/crates/vespertide-cli/src/commands/new.rs
index 440bc58..0ee17b7 100644
--- a/crates/vespertide-cli/src/commands/new.rs
+++ b/crates/vespertide-cli/src/commands/new.rs
@@ -23,7 +23,7 @@ pub fn cmd_new(name: String, format: Option<FileFormat>) -> Result<()> {
     };
 
     let schema_url = schema_url_for(format);
-    let path = dir.join(format!("{name}.{ext}"));
+    let path = dir.join(format!("{name}.vespertide.{ext}"));
     if path.exists() {
         bail!("model file already exists: {}", path.display());
     }
@@ -134,7 +134,7 @@ mod tests {
         cmd_new("users".into(), None).unwrap();
 
         let cfg = VespertideConfig::default();
-        let path = cfg.models_dir().join("users.json");
+        let path = cfg.models_dir().join("users.vespertide.json");
         assert!(path.exists());
 
         let text = fs::read_to_string(path).unwrap();
@@ -159,7 +159,7 @@ mod tests {
             model_format: FileFormat::Yaml,
             ..VespertideConfig::default()
         };
-        let path = cfg.models_dir().join("orders.yaml");
+        let path = cfg.models_dir().join("orders.vespertide.yaml");
         assert!(path.exists());
 
         let text = fs::read_to_string(path).unwrap();
@@ -185,7 +185,7 @@ mod tests {
             model_format: FileFormat::Yml,
             ..VespertideConfig::default()
         };
-        let path = cfg.models_dir().join("products.yml");
+        let path = cfg.models_dir().join("products.vespertide.yml");
         assert!(path.exists());
 
         let text = fs::read_to_string(path).unwrap();
@@ -206,12 +206,12 @@ mod tests {
 
         let cfg = VespertideConfig::default();
         std::fs::create_dir_all(cfg.models_dir()).unwrap();
-        let path = cfg.models_dir().join("users.json");
+        let path = cfg.models_dir().join("users.vespertide.json");
         std::fs::write(&path, "{}").unwrap();
 
         let err = cmd_new("users".into(), None).unwrap_err();
         let msg = err.to_string();
         assert!(msg.contains("model file already exists"));
-        assert!(msg.contains("users.json"));
+        assert!(msg.contains("users.vespertide.json"));
     }
 }
diff --git a/crates/vespertide-cli/src/utils.rs b/crates/vespertide-cli/src/utils.rs
index 6435f0e..e78d361 100644
--- a/crates/vespertide-cli/src/utils.rs
+++ b/crates/vespertide-cli/src/utils.rs
@@ -19,7 +19,7 @@ pub fn migration_filename_with_format_and_pattern(
         FileFormat::Yml => "yml",
     };
 
-    format!("{name}.{ext}")
+    format!("{name}.vespertide.{ext}")
 }
 
 fn sanitize_comment(comment: Option<&str>) -> String {
@@ -260,11 +260,11 @@ mod tests {
         Some("Hello! World"),
         FileFormat::Yml,
         "%04v_%m",
-        "0005_hello__world.yml"
+        "0005_hello__world.vespertide.yml"
     )]
-    #[case(3, None, FileFormat::Json, "%0v__", "0003.json")] // width 0 falls back to default version and trailing separators are trimmed
-    #[case(12, None, FileFormat::Json, "%v", "0012.json")]
-    #[case(7, None, FileFormat::Json, "%m", "0007.json")] // uses default when comment only and empty
+    #[case(3, None, FileFormat::Json, "%0v__", "0003.vespertide.json")] // width 0 falls back to default version and trailing separators are trimmed
+    #[case(12, None, FileFormat::Json, "%v", "0012.vespertide.json")]
+    #[case(7, None, FileFormat::Json, "%m", "0007.vespertide.json")] // uses default when comment only and empty
     fn migration_filename_with_format_and_pattern_tests(
         #[case] version: u32,
         #[case] comment: Option<&str>,