diff --git a/.env.sample b/.env.sample
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--- /dev/null
+++ b/.env.sample
@@ -0,0 +1 @@
+OPENAI_API_KEY=sk-1234567890abcdef1234567890abcdef
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+.env
+__pycache__/
+venv/
diff --git a/README.md b/README.md
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+++ b/README.md
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+# AI Calorie Counter App
+
+This GPT-4o powered Flask web app tells you how many calories there are in an image of a meal you upload
+
+## Quick Start
+
+1. Start the server:
+
+```sh
+$ python3 server.py
+```
+
+2. Go to http://localhost:5000
+
+
+## Terminal usage
+
+You can also use it from the terminal:
+
+```sh
+$ python3 calorie_counter.py IMAGE_FILE
+```
diff --git a/calorie_counter.py b/calorie_counter.py
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--- /dev/null
+++ b/calorie_counter.py
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+from openai import OpenAI
+from dotenv import load_dotenv
+import base64
+import json
+import sys
+
+load_dotenv()
+client = OpenAI()
+
+def get_calories_from_image(image_path):
+    with open(image_path, "rb") as image:
+        base64_image = base64.b64encode(image.read()).decode("utf-8")
+
+    response = client.chat.completions.create(
+        model="gpt-4o",
+        response_format={"type": "json_object"},
+        messages=[
+            {
+                "role": "system",
+                "content": """You are a dietitian. A user sends you an image of a meal and you tell them how many calories are in it. Use the following JSON format:
+
+{
+    "reasoning": "reasoning for the total calories",
+    "food_items": [
+        {
+            "name": "food item name",
+            "calories": "calories in the food item"
+        }
+    ],
+    "total": "total calories in the meal"
+}"""
+            },
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "text",
+                        "text": "How many calories is in this meal?"
+                    },
+                    {
+                        "type": "image_url",
+                        "image_url": {
+                            "url": f"data:image/jpeg;base64,{base64_image}"
+                        }
+                    }
+                ]
+            },
+        ],
+    )
+
+    response_message = response.choices[0].message
+    content = response_message.content
+
+    return json.loads(content)
+
+if __name__ == "__main__":
+    image_path = sys.argv[1]
+    calories = get_calories_from_image(image_path)
+    print(json.dumps(calories, indent=4))
diff --git a/requirements.txt b/requirements.txt
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--- /dev/null
+++ b/requirements.txt
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+openai
+flask
+python-dotenv
diff --git a/server.py b/server.py
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--- /dev/null
+++ b/server.py
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+from flask import Flask, render_template, request
+import tempfile
+
+from calorie_counter import get_calories_from_image
+
+app = Flask(__name__)
+
+@app.route("/")
+def index():
+    return render_template("index.html")
+
+@app.route("/upload", methods=["POST"])
+def upload():
+    image = request.files["image"]
+
+    if image.filename == "":
+        return {
+            "error": "No image uploaded",
+        }, 400
+
+    temp_file = tempfile.NamedTemporaryFile()
+    image.save(temp_file.name)
+
+    calories = get_calories_from_image(temp_file.name)
+    temp_file.close()
+
+    return {
+        "calories": calories,
+    }
+
+if __name__ == "__main__":
+    app.run(debug=True)
diff --git a/static/css/style.css b/static/css/style.css
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--- /dev/null
+++ b/static/css/style.css
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+body {
+    margin: 0;
+    padding: 0;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 100vh;
+    background-color: #f5f5f5;
+    font-family: Arial, sans-serif;
+}
+.container {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    align-content: center;
+    justify-content: center;
+    background-color: white;
+    border-radius: 15px;
+    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
+    padding: 20px;
+    width: 200px;
+    height: 200px;
+}
+#calorie-count {
+    width: 60%;
+    height: 20px;
+    border: 1px solid #ccc;
+    border-radius: 5px;
+    text-align: center;
+    margin-top: 20px;
+}
+#upload {
+    border: none;
+    outline: none;
+    padding: 0;
+    cursor: pointer;
+    background: none;
+}
+#upload img {
+    width: 90px;
+}
+
+#spinner {
+    display: none;
+    width: 50px;
+    height: 50px;
+    border: 5px solid #f3f3f3;
+    border-top: 5px solid #3498db;
+    border-radius: 50%;
+    animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+    0% {
+        transform: rotate(0deg);
+    }
+    100% {
+        transform: rotate(360deg);
+    }
+}
diff --git a/static/images/camera.png b/static/images/camera.png
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diff --git a/static/js/script.js b/static/js/script.js
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+++ b/static/js/script.js
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+const upload_button = document.querySelector("#upload");
+const calorie_count = document.querySelector("#calorie-count");
+
+upload_button.addEventListener("click", () => {
+    // ask to upload a file or take an image
+    const file_input = document.createElement("input");
+    file_input.type = "file";
+    file_input.accept = "image/*";
+    file_input.click();
+
+    file_input.addEventListener("change", () => {
+        loading();
+
+        const file = file_input.files[0];
+
+        const fd = new FormData();
+        fd.append("image", file);
+
+        fetch("/upload", {
+            method: "POST",
+            body: fd
+        }).then(response => response.json())
+        .then(data => {
+            stop_loading();
+            calorie_count.textContent = data.calories.total
+        });
+    });
+});
+
+
+function loading() {
+    document.querySelector("#upload").style.display = "none";
+    document.querySelector("#calorie-count").style.display = "none";
+    document.querySelector("#spinner").style.display = "block";
+}
+
+function stop_loading() {
+    document.querySelector("#spinner").style.display = "none";
+    document.querySelector("#upload").style.display = "block";
+    document.querySelector("#calorie-count").style.display = "block";
+}
diff --git a/templates/index.html b/templates/index.html
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+++ b/templates/index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Calorie Counter</title>
+    <link rel="stylesheet" href="/static/css/style.css" />
+</head>
+<body>
+    <div class="container">
+        <button id="upload"><img src="/static/images/camera.png" /></button>
+        <div id="calorie-count"></div>
+        <div id="spinner"></div>
+    </div>
+    <script src="/static/js/script.js"></script>
+</body>
+</html>
diff --git "a/test_images/DALL\302\267E 2024-05-23 08.13.42 - A realistic image of a healthy lunch consisting of a grilled chicken salad with mixed greens, cherry tomatoes, sliced cucumbers, and a light vinaigret.webp" "b/test_images/DALL\302\267E 2024-05-23 08.13.42 - A realistic image of a healthy lunch consisting of a grilled chicken salad with mixed greens, cherry tomatoes, sliced cucumbers, and a light vinaigret.webp"
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