diff --git a/overreact/cli.py b/overreact/cli.py
index 659e1e83..0e97e7b6 100644
--- a/overreact/cli.py
+++ b/overreact/cli.py
@@ -658,6 +658,15 @@ def _prepare_simulation(scheme, k, concentrations):
                 )
                 yield Markdown(f"Simulation data was saved to **{self.savepath}**")
 
+            if self.savepath is not None:
+                np.savetxt(
+                    self.savepath,
+                    np.block([t[:, np.newaxis], y(t).T]),
+                    header=f"t,{','.join(self.model.scheme.compounds)}",
+                    delimiter=",",
+                )
+                yield f"CSV file saved to {self.savepath}"
+
 
 def main():
     """Command-line interface."""
diff --git a/tests/test_core.py b/tests/test_core.py
index 03c5d9ca..1ff1343b 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -186,7 +186,8 @@ def test_private_functions_work():
                 ]
             )
         )
-    ) == ["E + S -> ES", "ES -> E + S", "ES -> ES‡", "ES‡ -> E + P"]
+        == ["E + S -> ES", "ES -> E + S", "ES -> ES‡", "ES‡ -> E + P"]
+    )
 
     assert list(
         rx.core._unparse_reactions(