The Best AI Chatbot — Free GPT-4, Claude & Gemini in One App
Merlin is the only AI chatbot that gives you instant access to the world's top AI models — GPT-4, Claude, and Gemini — completely free. No juggling apps. No extra subscriptions.
Start Chatting Free →No credit card required · Works on all devices
Everything You Need in One AI Chatbot
Merlin packs the most powerful AI features into a single, easy-to-use chatbot. Here's what makes it the best.
Multi-Model AI
Switch between GPT-4, Claude, and Gemini in a single chat. Pick the best model for every task — writing, coding, analysis, and more.
AI Personas
Chat with specialized AI personas — a coding expert, creative writer, career coach, and dozens more. Get focused help tailored to your needs.
Voice Chat
Speak to Merlin and get spoken replies. Voice mode works hands-free so you can multitask while getting AI-powered answers.
Image Generation
Generate stunning images from text prompts using DALL·E and Stable Diffusion — right inside the chat interface, no extra tools needed.
Persistent Memory
Merlin remembers your preferences, past conversations, and personal context so every chat feels personalized and picks up right where you left off.
Mobile & WhatsApp
Use Merlin on any device or chat directly inside WhatsApp. No app download required — the best AI chatbot is always one message away.
How to Use the Merlin AI Chatbot
Get up and running in under a minute. It's the simplest way to access the best AI models.
Open Merlin
Visit merlintheai.com or open Merlin in WhatsApp — no download or sign-up required to start.
Choose Your Model
Select GPT-4, Claude, or Gemini depending on your task. Not sure? Merlin auto-picks the best one.
Start Chatting
Type or speak your question. Get instant, accurate answers from the world's most powerful AI models.
Do More
Generate images, switch personas, save memories, and share chats — all inside one unified AI chatbot.
Frequently Asked Questions
Everything you need to know about the Merlin AI chatbot.
What is the best AI chatbot in 2025?
Merlin AI is widely regarded as one of the best AI chatbots because it gives you access to multiple top models — GPT-4, Claude, and Gemini — all in one free app. You don't need separate subscriptions for each model.
Is Merlin AI chatbot free to use?
Yes! Merlin offers a generous free tier so you can start chatting with GPT-4, Claude, and Gemini at no cost. Premium plans are available for power users who need higher limits and priority access.
Which AI models does Merlin support?
Merlin supports GPT-4, GPT-4o, Claude 3 (Opus, Sonnet, Haiku), and Google Gemini Pro — all accessible from a single interface. You can switch models mid-conversation to get the best answer for any task.
Can Merlin AI chatbot generate images?
Yes! Merlin includes built-in image generation powered by DALL·E and Stable Diffusion. Simply describe the image you want in the chat and Merlin will create it instantly.
Does the Merlin AI chatbot work on mobile?
Absolutely. Merlin works seamlessly on mobile browsers and also integrates directly with WhatsApp, so you can chat with the AI without installing a separate app.
How is Merlin different from ChatGPT?
Unlike ChatGPT which is locked to OpenAI models, Merlin gives you access to GPT-4, Claude, and Gemini in one place. Merlin also adds WhatsApp integration, AI personas, image generation, and persistent memory — features ChatGPT doesn't offer for free.
The Best AI Chatbot Is Free — Start Now
Join millions of users who use Merlin to chat with GPT-4, Claude, and Gemini every day. No sign-up hassle, no subscription required to start.
Start Chatting Free →Works on desktop, mobile & WhatsApp · Free forever plan available