Every platform reviewed on this site has tradeoffs: content filters you can't control, models you didn't choose, pricing that changes, or privacy policies that make you nervous. Building your own AI character chatbot means you own the whole stack. You pick the model. You set the rules. You control the data.

The best part? You don't need to know how to code. You can use Claude.ai (Anthropic's free AI assistant) to write the entire application for you. You just describe what you want in plain English, and it generates the code.

This guide walks you through building a web-based AI character chatbot using free tiers of everything: Claude.ai, OpenRouter (for AI model access), GitHub (for code hosting), and Vercel (for deployment). When you're done, you'll have a working chatbot live on the internet.

Create accounts on all four services. All free tiers, no credit card required.

Claude.ai: Go to claude.ai and sign up. This is your AI coding assistant. You'll paste prompts into the chat and it will generate your entire project.

GitHub: Go to github.com/signup. You'll use this to store and version your code. If you already have an account, skip this.

OpenRouter: Go to openrouter.ai and sign up. Once you're in, go to Keys in the dashboard and create an API key. Copy it somewhere safe, because you'll need it later. OpenRouter gives you access to free models as well as paid options if you want to upgrade later.

Vercel: Go to vercel.com/signup. Sign up with your GitHub account so that deployment is automatic later.

Before you build anything, you need to define your character. If you've used platforms like Character AI, Janitor AI, or any of the apps reviewed on this site, you're already familiar with this process. The difference is that instead of filling in separate boxes on a platform, you'll write it all in one block of text that becomes your character's "system prompt."

You can write one from scratch, or you can copy a character definition you already have from another platform and adapt it. Here's a template you can fill in:


Tips for better characters:

Go to claude.ai and start a new conversation. Paste in a prompt like this, with your character definition from Step 2 included:


Claude will generate the full project: file structure, components, API routes, styling, everything. It will show you each file with its contents.

Important: Claude.ai will give you the code as text in the chat. You'll need to create the files on your computer manually (copy each file's contents into a new file with the correct filename) or ask Claude to package it as a downloadable zip. If you're not sure how to do this, just ask Claude: "Can you give me step-by-step instructions for saving these files to my computer?"

Once you've saved all the files to a folder on your computer, open your terminal (on Mac: Terminal app, on Windows: PowerShell) and navigate to that folder. Then install the dependencies and run the app:


Open http://localhost:3000 in your browser. You should see your chatbot. Talk to it. Does the character feel right? If not, go back to Claude.ai and ask it to adjust the system prompt or behavior. You can paste in your conversation and say "the character sounds too formal, can you make the system prompt more casual?"

Common tweaks to ask Claude for:

Create a new repository on GitHub (click the + in the top right, then "New repository"). Name it whatever you want. Keep it public or private, your choice.

Then push your code from the terminal:


Important: Make sure your .env.local file is in .gitignore so your API key doesn't get published. Claude should have set this up, but double-check.

If you're not comfortable with the terminal, you can also upload files directly through GitHub's web interface. Just go to your new repository and click "Add file" then "Upload files."

Go to vercel.com/new. Import your GitHub repository. Vercel will auto-detect that it's a Next.js project.

Before deploying, add your environment variable:

Vercel will build and deploy your app. In about 60 seconds, you'll get a live URL like your-chatbot.vercel.app. That's it: your AI character chatbot is live on the internet.

Every time you push changes to GitHub, Vercel automatically redeploys. So you can keep improving your chatbot and it updates itself.

You've got a working chatbot. Here are some ideas for making it better:


Want to deploy a chatbot to Discord instead? Check out the companion guide: How to Deploy an AI Character Chatbot to Discord.

Is this actually free?
Yes, if you stay on free tiers. OpenRouter has free models. Vercel's free tier handles hobby traffic. Claude.ai's free tier is enough to generate and iterate on a project this size. GitHub is free for public and private repos.

Do I need to know how to code?
No. Claude.ai writes the code for you. You describe what you want in plain English. That said, being able to read code helps you understand what's happening, and you'll naturally pick it up as you go. If you get stuck at any point, just paste the error message into Claude and ask for help.

How good is the AI roleplay compared to Character AI?
It depends entirely on the model you choose and the quality of your character definition. Free models are decent but basic. Paid models through OpenRouter can match or exceed Character AI quality, especially with a well-written system prompt and good example messages.

Can other people use my chatbot?
Yes, anyone with the Vercel URL can use it. Your OpenRouter API key pays for the model usage, so keep an eye on costs if you share widely. You can add authentication if you want to restrict access.

Can I add NSFW content?
You control the content filter because it's your app. The model's behavior depends on the model provider's policies. Some models on OpenRouter are unfiltered, others aren't. Check the model details on OpenRouter before choosing.

Can I use a character definition from Character AI or another platform?
Absolutely. Copy the character's name, description, personality, and any example dialogues from the other platform. Paste them into the character definition template in Step 2 and adjust as needed. The format is slightly different but the content transfers directly.

Can I do this entire guide on mobile?
Mostly, yes. Claude.ai, GitHub, OpenRouter, and Vercel all work in a mobile browser. You can generate the code, create your accounts, set up your repo, and deploy to Vercel from your phone. The only step that's easier on a desktop is saving the code files and running terminal commands (Step 4). If you don't have a computer, you can skip local testing entirely: create your repo on GitHub's mobile site, upload the files Claude gives you, and connect it to Vercel. It'll deploy without you ever opening a terminal.