diff --git a/pyproject.toml b/pyproject.toml
index 96b5411..e948241 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,8 +12,15 @@ requires = ["setuptools>=68"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
-packages = ["hef", "tools"]
+packages = ["hef", "tools", "simulator"]
 
 [project.scripts]
 hef-ingest = "tools.ingest_cli:main"
 hef-review = "tools.review_cli:main"
+
+[project.optional-dependencies]
+sim = [
+    "fastapi>=0.110",
+    "uvicorn[standard]>=0.29",
+    "httpx>=0.27",
+]
diff --git a/simulator/__init__.py b/simulator/__init__.py
new file mode 100644
index 0000000..3c28577
--- /dev/null
+++ b/simulator/__init__.py
@@ -0,0 +1 @@
+"""Web-based curator's X-ray simulator for the experience filter."""