diff --git a/README.md b/README.md
index f62f55d..a9b05d4 100644
--- a/README.md
+++ b/README.md
@@ -18,10 +18,14 @@ A cluster is created when a certain number of points (defined with `--size`) eac
 Install with pip:
 
 ```sh
+# with kepler.gl visualization support
+pip install geoclustering[full]
+
+# only text-based output
 pip install geoclustering
 ```
 
-If the install fails, you might need to install kepler.gl build dependencies:
+If the `full` install fails, you might need to install kepler.gl build dependencies:
 
 ```sh
 # macos
@@ -138,7 +142,7 @@ It is assumed that you are using **Python3.9+**. It is encouraged to [setup a vi
 
 ```sh
     # install dependencies & dev-dependencies
-    pip install -e .[dev]
+    pip install -e .[dev,full]
 
     # install a git hook that runs the code formatter before each commit.
     pre-commit install
diff --git a/geoclustering/__main__.py b/geoclustering/__main__.py
index 723c841..a4c7367 100644
--- a/geoclustering/__main__.py
+++ b/geoclustering/__main__.py
@@ -72,12 +72,22 @@ def print_debug(s):
     io.write_output_file(output, "result.txt", encoded["string"])
     io.write_output_file(output, "result.json", encoded["json"])
     io.write_output_file(output, "result.geojson", encoded["geojson"])
+
     vis = io.write_visualization(output, "result.html", encoded["geojson"])
+    if vis is None:
+        print_debug(f"Skipped generating visualization: kepler is not installed.")
+
     click.echo(f"Output files saved to {Path(output).absolute()}")
 
     if open:
-        print_debug(f"Opening visualization in default browser")
-        webbrowser.open_new_tab("file://" + str(vis.absolute()))
+        if vis:
+            webbrowser.open_new_tab("file://" + str(vis.absolute()))
+            print_debug(f"Opened visualization in default browser.")
+        else:
+            click.secho(
+                "Can't open kepler.gl: package not installed. Please re-install geoclustering with `pip install geoclustering[full]`.",
+                fg="yellow",
+            )
 
     click.secho("Clustering completed.", fg="green")
 
diff --git a/geoclustering/io.py b/geoclustering/io.py
index 51ad016..4efe44b 100644
--- a/geoclustering/io.py
+++ b/geoclustering/io.py
@@ -1,5 +1,3 @@
-import math
-from keplergl import KeplerGl
 from pathlib import Path
 from pkg_resources import resource_filename
 import json
@@ -8,6 +6,14 @@
 import os
 import sys
 
+# kepler is optional, check if installed.
+try:
+    from keplergl import KeplerGl
+except:
+    has_kepler = False
+else:
+    has_kepler = True
+
 
 class HiddenPrints:
     """Disables stdout prints for a block of code."""
@@ -87,6 +93,10 @@ def write_output_file(dirname, filename, data):
 
 def write_visualization(dirname, filename, data):
     """Write a visualization, ensuring parent directories."""
+
+    if not has_kepler:
+        return None
+
     # Hide kepler stdout output.
     with HiddenPrints():
         map = KeplerGl()
diff --git a/setup.py b/setup.py
index 5c363ab..cd55ff0 100644
--- a/setup.py
+++ b/setup.py
@@ -28,13 +28,13 @@
     install_requires=[
         "click",
         "geojson",
-        "keplergl",
         "numpy",
         "pandas",
         "scikit-learn",
     ],
     extras_require={
         "dev": ["black", "wheel", "pre-commit", "pytest"],
+        "full": ["keplergl"],
     },
     include_package_data=True,
     zip_safe=False,