Here are the top free AI tools in 2025 for building and generating AI chatbots with prompt-based setup — perfect for websites, customer support, lead generation, and education.
🤖 Best Free AI Chatbot Tools (Prompt-Based)
1. Tidio AI Chatbot
- 💬 AI-powered customer support chatbot with drag-and-drop and prompt customization.
- ✅ Free plan available with AI support.
- Use prompts like: “Respond to customer asking for refund politely.”
2. Chatbase
- 📁 Turn your content (PDFs, URLs) into a ChatGPT-powered chatbot.
- ✅ Free tier allows 1 chatbot with 400K characters.
- Prompt customization: train your bot with Q&A-style prompts.
3. Botpress
- 🧠 Visual chatbot builder powered by OpenAI/GPT.
- ✅ Free cloud version with rich features.
- Use prompts to control bot replies: “How do I help users find pricing info?”
4. Landbot.io
- ✨ Conversational chatbot builder with AI block integration.
- ✅ Free tier with basic chatbot flows and GPT blocks.
- Prompt-based flows: “If user asks about shipping, reply with this.”
5. Flowise AI
- 🔗 Open-source visual LLM chatbot builder.
- ✅ 100% Free to self-host.
- Connect OpenAI/GPT-4, Gemini, etc. — build with prompt chains.
6. Jotform
- 🎯 Explore Jotform AI Chatbot Builder.
- ✅ Free with Jotform for basic usage.
- Prompts through “intents” like: “User says: cancel my order → Reply: here’s how to cancel…”
7. ManyChat (ChatGPT Integration)
- 💬 Build bots for Facebook, Instagram, WhatsApp.
- ✅ Free plan for basic usage.
- Supports GPT via API or tools like Zapier for prompt responses.
8. Chai AI
- 🤖 Create and share AI characters with prompt-defined personalities.
- ✅ Free for basic use.
- Prompt idea: “You are a helpful travel assistant who recommends places based on weather and mood.”
9. Poe by Quora
- 💬 Build AI chatbot personas using GPT, Claude, Gemini, and more.
- ✅ Free with custom bots and prompt configuration.
- Example: “Bot that gives motivational quotes when user types ‘I’m tired’”
10. Notion AI + Q&A
- 📘 Create internal chat-like experiences with knowledge base.
- ✅ Free trial included with Notion workspace.
- Great for: AI wiki or FAQ bot with prompt control.
🧠 Bonus Prompt Examples:
- “You are a polite customer service assistant who always apologizes first.”
- “If the user asks about pricing, guide them to the pricing page link.”
- “Greet every new visitor and ask their first name.”