diff --git a/README.md b/README.md
index 10dbdedd6091..190eb9bdf9ef 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,16 @@
-# Welcome to Streamlit!
+# Material Stock Manager
 
-Edit `/streamlit_app.py` to customize this app to your heart's desire. :heart:
+This Streamlit app allows you to track materials in stock. Materials are chosen
+from a small predefined list:
 
-If you have any questions, checkout our [documentation](https://docs.streamlit.io) and [community
-forums](https://discuss.streamlit.io).
+* Piedra Caliza
+* Durmientes de Madera
+* Malla de Acero
+
+You can:
+
+1. Add a material from the list with an initial quantity.
+2. Increase or decrease the quantity of an existing material.
+3. View a table and bar chart showing the current stock levels.
+
+Run the app with `streamlit run streamlit_app.py`.
diff --git a/streamlit_app.py b/streamlit_app.py
index ac305b93bffd..bc5ea429b005 100644
--- a/streamlit_app.py
+++ b/streamlit_app.py
@@ -1,38 +1,44 @@
-from collections import namedtuple
-import altair as alt
-import math
-import pandas as pd
 import streamlit as st
+import pandas as pd
 
-"""
-# Welcome to Streamlit!
-
-Edit `/streamlit_app.py` to customize this app to your heart's desire :heart:
-
-If you have any questions, checkout our [documentation](https://docs.streamlit.io) and [community
-forums](https://discuss.streamlit.io).
-
-In the meantime, below is an example of what you can do with just a few lines of code:
-"""
-
-
-with st.echo(code_location='below'):
-    total_points = st.slider("Number of points in spiral", 1, 5000, 2000)
-    num_turns = st.slider("Number of turns in spiral", 1, 100, 9)
-
-    Point = namedtuple('Point', 'x y')
-    data = []
-
-    points_per_turn = total_points / num_turns
-
-    for curr_point_num in range(total_points):
-        curr_turn, i = divmod(curr_point_num, points_per_turn)
-        angle = (curr_turn + 1) * 2 * math.pi * i / points_per_turn
-        radius = curr_point_num / total_points
-        x = radius * math.cos(angle)
-        y = radius * math.sin(angle)
-        data.append(Point(x, y))
-
-    st.altair_chart(alt.Chart(pd.DataFrame(data), height=500, width=500)
-        .mark_circle(color='#0068c9', opacity=0.5)
-        .encode(x='x:Q', y='y:Q'))
+st.title("Material Stock Manager")
+
+# Initialize session state for materials
+if 'materials' not in st.session_state:
+    st.session_state.materials = {}
+
+MATERIAL_OPTIONS = [
+    "Piedra Caliza",
+    "Durmientes de Madera",
+    "Malla de Acero",
+]
+
+st.header("Add a new material")
+with st.form("add_material"):
+    name = st.selectbox("Material", MATERIAL_OPTIONS)
+    qty = st.number_input("Initial quantity", min_value=0, step=1, value=0)
+    submitted = st.form_submit_button("Add/Update")
+    if submitted:
+        current = st.session_state.materials.get(name, 0)
+        st.session_state.materials[name] = current + int(qty)
+
+if st.session_state.materials:
+    st.header("Adjust stock")
+    with st.form("adjust_stock"):
+        material = st.selectbox("Select material", list(st.session_state.materials.keys()))
+        delta = st.number_input("Add/Subtract quantity", value=0, step=1, format="%d")
+        adjust = st.form_submit_button("Apply")
+        if adjust:
+            st.session_state.materials[material] += int(delta)
+            if st.session_state.materials[material] < 0:
+                st.session_state.materials[material] = 0
+
+    st.header("Current stock")
+    df = pd.DataFrame({
+        'Material': list(st.session_state.materials.keys()),
+        'Quantity': list(st.session_state.materials.values())
+    })
+    st.dataframe(df.set_index('Material'))
+    st.bar_chart(df.set_index('Material'))
+else:
+    st.info("No materials in stock. Add materials above.")