Build an AI Chatbot That Doesn’t Cost a Dime

I built a custom AI chatbot in Python that answers questions only from my own data — no OpenAI, no paid APIs, completely free. This is a lightweight RAG (Retrieval Augmented Generation) system built with pure Python. No frameworks, no vector databases, no cloud bills. 🛠️ Stack: - Groq — free LLM API (Llama 3.3 70B) - Sentence Transformers — text to vector embeddings - Cosine Similarity — context retrieval - Python — pure Python, no FastAPI, no React ⚙️ How it works: 1. Custom context data is encoded into vectors once 2. Each user question is compared against the vectors using cosine similarity 3. The top 3 most relevant chunks are retrieved 4. Retrieved context is injected into the Groq prompt 5. The model answers only from that context — no hallucinations 6. Chat history maintains memory across the conversation You can swap the Python knowledge base for any topic — your own docs, product manuals, internal wikis, anything. 📂 Full SOURCE CODE on GitHub: https://github.com/TechByRalph/ChatbotTutorial 🔑 Get your free Groq API key: https://groq.com/ Sentence Transformer From Hugging Face: https://huggingface.co/sentence-transformers/all-MiniLM-L6-v2 🔴About My YouTube Channel🔴 Hi, I am Tech By Ralph, and I am a Developer Who is Interested in Helping You Reach Your Developer Goals, Through Videos Just Like This. I Offer Coding Tutorials, Coding Advice, and Personal Experience Helping You Evolve Your Skills And Stay Up-To-Date With Tech •Subscribe: https://www.youtube.com/@TBR-TechByRalph 🎥 Recommended Video: - I Studied Computer Science for 3 Years (Here is What You Need to Know): https://youtu.be/N63ic161Z4s ➡Please Note That All Videos and Information on This Channel are for Educational and Informational Purposes Only. 📱My Socials: YouTube: https://youtube.com/@TBR-TechByRalph?si=nwOJ2MtJhLVLd5dx Medium: https://medium.com/@TechByRalph ⏱️ Chapters: 00:00 - Introduction 0:36 - Get Data 1:09 - Sentence Transformer 2:56 - Prompt To Vector Transformer 5:22 - Groq LLM 7:18 - Talk To Chatbot 8:07 - END #python #chattbot #coding #ai #machinelearning