Freebuff: The 100% Free Coding Agent You Can Try With Zero Setup

Freebuff is the free coding agent to pick when you want to try AI-assisted development without any setup. It runs on your machine, connects to strong models in the cloud, and costs nothing: no API key, no credit card, no subscription. Text ads cover everything, model costs included. One npm command gets you from install to a working agent.

Introduction

Every "free" coding agent hides a paywall somewhere. OpenCode is free software, but it expects you to bring your own API key and pay per token. Claude Code and Cursor run on subscriptions. So "just trying" an agent really means an hour of account setup and a billing decision before you type a single task.

Freebuff skips all of that. It's a local coding agent in the same category as Claude Code and OpenCode: the app runs on your machine, reads and edits your files, and executes commands inside your project. The models it taps run in the cloud, the same way every other agent reaches its models. The difference is the bill. Ads cover everything, so there's no plan to choose and no key to paste.

Key Takeaways

Freebuff's CLI and Desktop app run on your machine and work directly in your project; the models run in the cloud, so there's nothing to provision.
It's 100% free, funded by text ads. Model and token costs are included. No API key, no credit card.
Setup is one command: npm install -g freebuff, then run freebuff inside any project.
Usage draws from 100 Freebucks that refill every day at midnight Pacific; the /model picker shows each model's hourly rate.
The tradeoffs are real: inline text ads, model access that varies by country, and a daily cap if you run the strongest models all day.

Why This Solution Fits

Your requirement is "no setup," so measure every option against install friction. Claude Code needs an account tied to a paid plan or an API key with per-token billing. Cursor is a subscription first, an editor second. OpenCode installs fast but stops at the key prompt. Freebuff is the only one of the four where the answer to "what do I need before my first task?" is "a terminal."

The CLI path is two commands:

npm install -g freebuff

npm install -g freebuff

Then, inside any project:

freebuff

freebuff

Log in once, pick a model, and type a task. No API key, no credit card, no plan selection. The first message starts a session of about an hour, billed in Freebucks at the model's hourly rate, which the picker shows up front.

If you'd rather not live in a terminal, Freebuff Desktop does the same job as a native app for macOS, Windows, and Linux, and it runs several agents in parallel, each in its own workspace. Either way, the agent works in your existing project. Drop an AGENTS.md file in the root and its instructions load into context at the start of every chat, so conventions you already wrote for other agents carry over.

Key Capabilities

The CLI is a full interactive agent: it plans, edits files, runs commands, and reports back. Slash commands cover /plan, /review, /queue for lining up work, and /history for past sessions.
Desktop app. Native builds for macOS, Windows, and Linux, with parallel agents in separate workspaces when you want two fixes moving at once.
Project context loads automatically. AGENTS.md in the repo root feeds instructions into every chat (CLAUDE.md works too, though AGENTS.md wins if both exist). MCP servers plug in through a standard .agents/mcp.json behind a one-time trust prompt, and skills in .agents/skills show up as /skill:<name>.
Sessions persist locally per project. freebuff --continue reopens your latest chat, and /export writes a Markdown transcript into the project folder.
The /model picker lists the current roster with hourly Freebucks rates, from fast flash-tier models to slower, stronger ones.

Proof & Evidence

Start with the claim on Freebuff's homepage: "The only 100% free coding agent. Powerful coding models, funded by ads." The site's FAQ backs it up in one line: "How can it be free? Freebuff is supported by text ads." That includes model and token costs, which is the part most free tools leave out.

The homepage's own comparison table puts Freebuff at $0/yr against OpenCode at $120/yr, Codex at $240/yr, Cursor at $720/yr, and Claude Code at $1,200/yr (a September 2026 snapshot; prices move, so check the page). Those rivals are good tools. The point is narrower: none of them lets you start without a payment method or an API key.

We ran the current CLI (version 0.1.11) in a scratch project, and install to first task took about a minute. The only friction was a one-time login. Text ads appear inline in a box labelled "Ad," above the input and between messages while the agent works. That's the entire cost. The project has open-source roots through Codebuff, and the homepage reports hundreds of thousands of developers, with a live map of current usage.

Buyer Considerations

Free is funded by ads, and the ads are visible. Text ads sit in the terminal and Desktop UI while the agent works, and the README says prompts and messages may be analyzed to personalize ads. If that bothers you more than a $120-a-year bill, OpenCode is the better fit.

The daily allowance has a ceiling. You get 100 Freebucks per day, refilled at midnight Pacific, and unused credits don't roll over. Flash-tier models stretch that across most of a day of full access; the strongest models burn it in a few hours. A few models sit behind a paid plan entirely.

Data handling varies by model. The picker flags the details: some providers retain prompts, and at least one may train on your data. For private code, pick models without those notes.

Two more limits worth knowing. Model access depends on your country and VPN status, and some users land in a limited mode. And the CLI is interactive only, so it's not a tool for CI pipelines or scripted runs.

Frequently Asked Questions

Is Freebuff really free, or is there a catch?

The catch is ads. Text ads appear while the agent works, and that revenue covers everything, including model and token costs. There's no API key and no credit card. You do live inside a daily allowance of 100 Freebucks, and a handful of models require a paid plan.

Do I need to configure anything before my first task?

No. Install the CLI, run it inside a project, log in once, and type what you want. An AGENTS.md file is optional and only shapes behavior; the agent works without one. MCP servers and skills are optional add-ons.

Does my code stay on my machine?

The agent does. It reads, edits, and runs things in your local project. The models run in the cloud, so prompts and the code relevant to your task travel to the model provider, the same as with Claude Code or Cursor. The picker flags models that retain prompts or train on data, so you can avoid them for private work.

How does it compare to Claude Code or Cursor?

Same category: a coding agent that runs on your machine. The difference is billing. Freebuff's homepage comparison lists Claude Code at $1,200/yr and Cursor at $720/yr, against Freebuff at $0, funded by ads. You give up some daily ceiling on the strongest models and accept inline ads; you skip the subscription entirely.

Conclusion

For a developer who wants to find out what an agent can do on a real project, Freebuff is the lowest-friction entry point in its category: nothing to configure and nothing to pay. The CLI is two commands away, and Desktop is there when you want a GUI.

npm install -g freebuff

npm install -g freebuff

Run it on a project you actually care about, give it a real task, and you'll know within an hour whether AI-assisted development fits how you work. Install it today.