Building Powerful AI Apps with OpenAI, Streamlit, and LangChain

feature image- AI apps

OpenAI and Streamlit are two more key players in the development of advanced AI applications.

OpenAI, the inventor of ground-breaking language models such as GPT-3, has been instrumental in pushing the limits of what AI can accomplish.

Streamlit, on the other hand, provides a quick and easy approach to creating custom web apps for machine learning and data science.

In conjunction with LangChain, these tools pave the path for the construction of advanced and powerful AI apps. LangChain is the foundation, giving the framework and ‘rapid plumbing’ required for sophisticated LLM operations.

OpenAI delivers the strength of its cutting-edge language models, while Streamlit enables simple, efficient web application deployment. This trinity of technologies constitutes a formidable armory for AI developers seeking to create superior, domain-specific apps.

About OpenAI, Streamlit, and LangChain

OpenAI is an AI research organization dedicated to ensuring that artificial general intelligence (AGI) benefits humanity as a whole. The GPT series of language models is one of its most noteworthy creations.

These large language models (LLMs) have many uses and may generate human-like prose in response to an input prompt. However, offering nuanced, professional replies to issues requiring significant domain expertise can be difficult for these LLMs.

LangChain enhances LLMs’ capabilities by making them more customizable and domain-specific. It employs “prompt plumbing,” a technique that involves breaking down a massive text corpus into manageable summaries, embedding them in a vector space, and retrieving similar portions when a question is asked. This dramatically improves LLM functionality.

Furthermore, LangChain is based on the concept of “chains,” allowing the connection of numerous components for complicated LLM usage. Prompt Templates, Models (LLMs), Agents, and Memory Modules are a part of these chains.

LangChain enables developers to design cohesive apps capable of accomplishing complex tasks by chaining components.

Streamlit is the technology to turn these data scripts into shareable web apps once an AI application is constructed utilizing LangChain and OpenAI’s models. It is a user-friendly Python framework that enables developers to quickly and simply transform machine learning models and data analysis into interactive web apps.

It can act as an interface layer, allowing end users to interact with advanced AI applications built with LangChain and OpenAI models.

The combination of OpenAI, LangChain, and Streamlit has the potential to be a strong trinity. OpenAI offers the basic AI models, LangChain extends and customizes them, and Streamlit turns these upgraded models into interactive online applications.

This collaboration can dramatically expedite the development of complex AI applications and revolutionize the AI environment.

Crafting a Powerful AI App with LangChain, OpenAI, and Streamlit: Step-by-Step Guide

If you’ve ever wondered how you could use LangChain, OpenAI, and Streamlit to build your intelligent online application, you’ve come to the right spot!

In this post, we’ll walk you through the building of a LangChain-enhanced Streamlit app, explaining how to use OpenAI’s GPT-3 model along the way.

Before we begin, make sure your system has the necessary dependencies installed:

installing dependencies

Streamlit is an excellent tool for developing data science web apps, LangChain provides a framework for working with Large Language Models (LLMs), and OpenAI provides access to the ground-breaking GPT-3 language model.

Kickstarting the Web App

Adding Libraries

Start by importing the required packages. Notably, we’re importing three classes from the LangChain package:

importing libraries

We require all: LLMChain, SimpleSequentialChain, and PromptTemplate for running our language model chains.

Configuring the App

Set the title and other essential information for your app using the Streamlit syntax.

configuring AI app

Creating Widgets for User Interaction

Your app must interact with users. For example, allowing them to access the language model by entering their OpenAI API key. We also provide a text input widget where people can enter their questions.

widget creation of user interaction

Unleashing the Power of Chains

With the press of a button, we’ll feed the query through numerous SimpleSequentialChain pipelines to generate a well-thought-out response to our user’s question.

The concept here is that the output of one chain becomes the input for the next, resulting in a series of operations that provides our final response. We have four different chains in the works, each with a specific purpose:

  • Question Chain: Takes a user’s query as input and outputs it.
  • Assumptions Chain: Uses the Question Chain to construct assumptions based on the statement.
  • Fact-checking Chain: Verifies the assumptions.
  • Answer Chain: Provides the ultimate solution based on the facts and assumptions validated in the preceding chains.

code example for creating chain in langchain

And there you have it! By building a fact-checking app with LangChain, OpenAI, and Streamlit, you’ve entered the world of AI-powered web applications. However, this is only scraping the surface of the enormous possibilities offered by these robust instruments.

Though exciting, building web apps with AI can be difficult at times, and certain features may appear oppressive. If you ever find yourself in such a position or wish to design more complicated apps, keep in mind that expert assistance is only a click away.

Leveraging OpenAI, LangChain, and Streamlit for Industry-specific Applications

OpenAI, LangChain, and Streamlit can be combined to create highly specialized applications in a variety of sectors. Here are a couple of such examples:


AI applications in healthcare can deliver individualized patient care, automate appointment scheduling, and even offer medical advice based on symptoms. OpenAI’s nuanced language understanding, combined with LangChain’s customizability and Streamlit’s user-friendly interface, may power interactive health portals.

An AI chatbot, for example, can triage patients, leading them to the proper level of care depending on their symptoms, decreasing the strain on medical workers.


E-commerce AI can fuel recommendation engines, and customer care chatbots, and potentially automate key elements of the e-commerce supply chain.

An intelligent chatbot can be created using OpenAI and LangChain to aid customers in product selection, answer their questions, and even handle returns and complaints.

Streamlit can then turn this into an interactive web app that interfaces smoothly with the e-commerce platform, resulting in a better user experience.


The combination of OpenAI, LangChain, and Streamlit has the potential to transform online learning. Because of the customization capabilities of LangChain, GPT-3 can be used to create an AI-enhanced tutor capable of addressing students’ inquiries 24/7 in an accurate and contextually relevant manner.

This AI tutor, offered by Streamlit as a user-friendly online tool, provides personalized learning support, improving the educational experience and freeing up human educators to focus on more sophisticated teaching activities


AI applications in finance can range from investing in robo-advisors to chatbots for customer service and even fraud detection systems. These applications can understand complex financial language and give accurate, useful information to consumers because of the capability of GPT-3.

LangChain can further tailor these responses to reflect the company’s policies and tone of voice, and Streamlit makes it simple to deploy these models.

These are only a few examples. The possible applications are essentially infinite and cover almost every industry.
Businesses with the proper knowledge and vision may use the power of OpenAI, LangChain, and Streamlit to innovate, improve customer experience, and gain a competitive advantage in their industry.

Transform Your Business with AI Solutions From OnGraph

In the ever-changing world of artificial intelligence, it’s evident that a combination of OpenAI, LangChain, and Streamlit has immense potential. This combination could transform the way we create and engage with AI applications.

These three technologies combined create a powerful tool for developers. They can use it to develop domain-specific apps and powerful AI apps. These apps can serve various purposes from customer service to online education.

It’s an exciting time to be in the AI area, with enormous opportunities for growth and innovation. The combination of advanced AI models is revolutionary. Added to this are frameworks for managing these models. Lastly, methods for deploying the models as interactive web apps play a key role. Together, these elements define the future of AI application development.

We are here to support you if you’re ready to explore these technologies. OnGraph has a team of professionals ready to assist. They can guide you through the complexity of AI application development. Furthermore, they can help you realize the full potential of these game-changing technologies.

To get started, contact us today.