DemoGPT
Turn Natural Language Into Working AI Apps
Founded
2023
Starting Price
Free
Category
Developer Tools
Last updated March 5, 2026
About DemoGPT
DemoGPT is an open-source Python library that simplifies building AI agents and interactive applications powered by large language models. It uses GPT-3.5-turbo and other LLMs to automatically generate LangChain code from plain-English instructions, producing fully functional Streamlit apps without requiring deep coding knowledge. The platform provides pre-built tools for web search, code execution, document analysis, and more, along with support for multiple agent types including tool-calling agents, ReAct agents, and RAG. DemoGPT handles reasoning, tool chaining, and response generation automatically, making it accessible for rapid prototyping of AI-powered applications.
Pros & Cons
Pros
- Completely free and open-source under MIT license with no usage limits
- No coding expertise required for basic app generation from natural language
- Fast prototyping — go from idea to working demo in minutes
- Strong LangChain integration and ecosystem compatibility
- Supports multiple LLM backends without vendor lock-in
Key Features
Natural Language to App
Converts text prompts into working Streamlit applications automatically using LLM-powered code generation.
Multiple Agent Types
Supports ToolCallingAgent for tool selection, ReactAgent for step-by-step reasoning, and RAG-based agents for document retrieval.
Built-in Tool Library
11+ pre-built tools including DuckDuckGo search, YouTube/Wikipedia/Arxiv search, weather data, Python/Bash execution, and YOLO detection.
RAG Support
Retrieval-Augmented Generation with multiple vector store backends including Chroma, Pinecone, and FAISS.
Custom Tool Creation
Developers can define and integrate their own tools into the agent framework for domain-specific use cases.
Iterative Self-Refining
Each code segment is individually tested and the system self-corrects errors automatically during generation.
LangChain Integration
Deep integration with LangChain for orchestration, tool chaining, and agent management.
Pricing
Open Source
Free
- All features included
- MIT license
- Unlimited usage
- Community support
- Self-hosted
Best For
AI Agent Prototyping
Quickly build and test AI agent concepts with pre-built tools and multiple agent architectures before committing to full development.
Internal Tool Generation
Create functional Streamlit dashboards and tools from natural language descriptions for internal team use.
Educational Demos
Generate interactive AI demos for teaching LLM concepts, agent architectures, and LangChain workflows.
RAG Application Development
Build document Q&A systems with retrieval-augmented generation using various vector store backends.
