diff --git a/src/grovers_visualizer/parse.py b/src/grovers_visualizer/args.py
similarity index 62%
rename from src/grovers_visualizer/parse.py
rename to src/grovers_visualizer/args.py
index 0b1665c..f94287e 100644
--- a/src/grovers_visualizer/parse.py
+++ b/src/grovers_visualizer/args.py
@@ -2,6 +2,7 @@ from argparse import ArgumentParser
 from dataclasses import dataclass
 
 from grovers_visualizer.state import QubitState
+from grovers_visualizer.utils import get_app_version
 
 
 @dataclass
@@ -14,9 +15,36 @@ class Args:
 
 def parse_args() -> Args:
     parser = ArgumentParser(description="Grover's Algorithm Visualizer")
+
+    parse_opts(parser)
+    parse_cli(parser)
+
+    ns = parser.parse_args()
+
+    return Args(
+        target=ns.target,
+        iterations=ns.iterations,
+        speed=ns.speed,
+        ui=ns.ui,
+    )
+
+
+def parse_opts(base_parser: ArgumentParser) -> None:
+    parser = base_parser
+
+    parser.add_argument("-V", "--version", action="version", version=f"%(prog)s {get_app_version()}")
+
+
+def parse_cli(base_parser: ArgumentParser) -> None:
+    parser = base_parser.add_argument_group("cli")
+
+    parser.register("type", "qubit state", QubitState.from_str)
+
     parser.add_argument(
         "target",
-        type=str,
+        type="qubit state",
+        default=QubitState.from_str("1111"),
+        nargs="?",
         help="Target bitstring (e.g., 1010)",
     )
     parser.add_argument(
@@ -34,10 +62,3 @@ def parse_args() -> Args:
         help="Pause duration (seconds) between steps (deafult: 0.5)",
     )
     parser.add_argument("--ui", action="store_true", help="Run with DearPyGui UI")
-    ns = parser.parse_args()
-    return Args(
-        target=QubitState.from_str(ns.target),
-        iterations=ns.iterations,
-        speed=ns.speed,
-        ui=ns.ui,
-    )
diff --git a/src/grovers_visualizer/cli.py b/src/grovers_visualizer/cli.py
index 30497e9..b11a37c 100644
--- a/src/grovers_visualizer/cli.py
+++ b/src/grovers_visualizer/cli.py
@@ -7,8 +7,8 @@ from matplotlib.gridspec import GridSpec
 from qiskit import QuantumCircuit
 from qiskit.quantum_info import Statevector
 
+from .args import Args
 from .circuit import diffusion, oracle
-from .parse import Args
 from .plot import SinePlotData, plot_amplitudes, plot_circle, plot_sine
 from .utils import all_states, optimal_grover_iterations
 
diff --git a/src/grovers_visualizer/main.py b/src/grovers_visualizer/main.py
index 409f606..9bdf73d 100644
--- a/src/grovers_visualizer/main.py
+++ b/src/grovers_visualizer/main.py
@@ -6,8 +6,8 @@ simulation using Qiskit's Aer simulator, and visualizes the results
 using matplotlib.
 """
 
+from .args import parse_args
 from .cli import run_cli
-from .parse import parse_args
 from .ui import run_dpg_ui
 
 
diff --git a/src/grovers_visualizer/ui/__init__.py b/src/grovers_visualizer/ui/__init__.py
index 1380fcc..b21726c 100644
--- a/src/grovers_visualizer/ui/__init__.py
+++ b/src/grovers_visualizer/ui/__init__.py
@@ -1,6 +1,6 @@
 from importlib.util import find_spec
 
-from grovers_visualizer.parse import Args
+from grovers_visualizer.args import Args
 
 
 def is_dearpygui_available() -> bool:
@@ -10,11 +10,11 @@ def is_dearpygui_available() -> bool:
         return False
 
 
-def run_dpg_ui(_args: Args) -> None:
+def run_dpg_ui(args: Args) -> None:
     if not is_dearpygui_available():
-        print("DearPyGui is not installed. Install with: pip install .[ui]")
+        print("DearPyGui is not installed. Install with: pip install 'grovers-visualizer[ui]'")
         return
 
     from .dpg import run_dearpygui_ui
 
-    run_dearpygui_ui()
+    run_dearpygui_ui(args)
diff --git a/src/grovers_visualizer/utils.py b/src/grovers_visualizer/utils.py
index 4b7e82f..e90f9c6 100644
--- a/src/grovers_visualizer/utils.py
+++ b/src/grovers_visualizer/utils.py
@@ -1,6 +1,8 @@
+import tomllib
 from collections.abc import Iterator
 from itertools import product
 from math import floor, pi, sqrt
+from pathlib import Path
 
 from .state import QubitState
 
@@ -27,3 +29,16 @@ def get_bar_color(state: str, target_state: QubitState | None, iteration: int, o
     if optimal_iteration and is_optimal_iteration(iteration, optimal_iteration):
         return "green"
     return "orange"
+
+
+def get_app_version(pyproject_path: str = "pyproject.toml") -> str:
+    """Reads the version from the [project] section of pyproject.toml."""
+    path = Path(pyproject_path)
+    if not path.is_file():
+        raise FileNotFoundError(f"{pyproject_path} not found.")
+    with path.open("rb") as f:
+        data = tomllib.load(f)
+    try:
+        return str(data["project"]["version"])
+    except KeyError:
+        raise KeyError("Version not found in [project] section of pyproject.toml.")