Quick answer: Freebuff is a free AI coding agent that brings agentic programming to your command line. It installs easily, works with multiple AI models, and follows the same open architecture as OpenCode so beginners can start coding with AI for zero cost.
Freebuff is the free coding agent — powerful AI models funded by ads instead of your wallet. No API key, no credit card, no subscription. This easy tutorial installs Freebuff, picks a model, and puts it to work on your project today.
What is Freebuff?
Freebuff is a 100% free coding agent from the team behind Codebuff. It runs powerful models like GPT and Claude-class open models right on your machine (or in the cloud), and pays for them with text ads — the same trade you already accept from free search engines and social media.
Five products, one $0 price tag
| Product | What it gives you |
|---|---|
| Freebuff CLI | A free coding agent in your terminal — the direct Claude Code replacement |
| Freebuff Desktop | Run several coding agents in parallel, each in its own workspace (macOS, Windows, Linux) |
| Freebuff Web | AI web app builder with managed hosting — from prompt to a live app on its own URL |
| Freebuff Cloud | A full cloud IDE that works on any GitHub repo — editor, terminal and sandbox, nothing to install |
| Freebuff Chat | A research assistant that reads the web and answers with sources |
How the free model works
Every day you get 100 Freebucks to spend on any mix of models. Different models draw different amounts, so you can use a top-tier reasoning model for hard tasks and a fast one for quick edits. A few of the models on offer:
| Model | Approx. use per day |
|---|---|
| GPT-6 Luna | 5 hours |
| DeepSeek V4.1 Flash | 6 hours |
| GLM 5.3 Flash | 20 hours |
| MiMo 2.6 Pro | 3 hours |
| Solar Pro 4 | 10 hours |
Freebucks refill at midnight Pacific, don’t carry over, and usage depends on your country and VPN. The site is straightforward about limits — generous enough to learn and ship real projects, with a paid plan if you outgrow them.
Step 1: Install Freebuff CLI
npm install -g freebuffStep 2: Run it in your project
cd your-project
freebuffThat’s it — no API key, no account creation, no credit card. The CLI opens a session at the Freebuff prompt where you can ask for features, fixes or explanations the same way you would with Claude Code.
Step 3: Try a first prompt
Start with something small and verifiable:
Explain this project and list the three files I should read first to understand it.Then level up to a real change:
Add a contact form to this page that saves submissions to a JSON file.Take it further: Freebuff Web and Cloud
No coding background? Freebuff Web is your on-ramp: describe an app in one prompt, and it builds and hosts it on a free URL. For developers, Freebuff Cloud connects a GitHub repo in seconds and drops you into a cloud IDE with a real sandbox — public repo, private repo, no setup and no lock-in. Both are excellent ways to prototype without touching a terminal.
Freebuff — quick FAQ
How can Freebuff be free?
Freebuff is funded by text ads shown in the tool, plus optional paid plans for users who outgrow the daily free quota. The free tier stays genuinely useful for real development.
Do I need an API key or credit card?
No. The free tier needs no API key and no card. Just install and run.
Is Freebuff the same as Claude Code?
No. Claude Code is Anthropic’s subscription-based terminal agent. Freebuff is an independent ad-funded coding agent that aims to be the $0 alternative to Claude Code, Codex, Cursor and similar tools.
Which operating systems does Freebuff support?
Freebuff Desktop and CLI support macOS, Windows and Linux. Freebuff Web and Cloud run in your browser, so they work on any device.
Compare Freebuff with the other AI assistants in the Complete Guide to AI Coding Assistants, and learn Claude Code, Google Antigravity and the open-source OpenCode too.