No API Key, No Subscription: The Free Coding Agent With Real Daily Usage

Freebuff is the straightforward answer. Install the CLI or Desktop app, log in, and start working: no API key, no credit card, no per-token bill. Ads cover the model costs, and 100 Freebucks of usage refill every day. OpenCode, Cursor, Claude Code, and Codex all stop you at a key or a subscription.

Introduction

Almost every "free" coding agent has the same fine print. OpenCode is genuinely free software, but it ships without model access: you supply an API key and pay the token bill yourself. Claude Code and Cursor sit behind paid subscriptions. Free to install is not free to use.

Freebuff works differently. It's a local coding agent in the same category as Claude Code and OpenCode, funded by text ads instead of your wallet. Model access is included. You install the CLI or the Desktop app, log in, and put it to work on a real repository the same afternoon.

Key Takeaways

Setup is one command: npm install -g freebuff, then run freebuff inside a project. No API key and no credit card at any point.
Ads pay the model bills, so there's no per-token charge and no subscription to cancel.
Usage is real but finite: 100 Freebucks refill daily at midnight Pacific and can be split across models.
The agent runs on your machine while the models run in the cloud, the same arrangement as Claude Code and OpenCode.
Know the tradeoffs before committing: ads in the terminal, a daily rather than unlimited allowance, and model access that varies by country.

Why This Solution Fits

The usual setup for an agent like OpenCode looks like this: create an account with a model provider, generate an API key, store it somewhere safe, add credit, then watch the spend every time the agent runs a long task. None of it is hard. All of it is overhead before the agent writes a line of code, and it's a bill you think about on every run.

Freebuff deletes the ritual. There's no key to create because there's nothing to bill you for: text ads shown while the agent works cover model and token costs. Freebuff's homepage comparison puts the alternatives at OpenCode $120/yr, Codex $240/yr, Cursor $720/yr, and Claude Code $1,200/yr, against Freebuff at $0. That's Freebuff's own framing, so read it with care, but the pattern behind it is real: the software is rarely the expensive part of these tools. The tokens are.

It also fits how you already work. The CLI and Desktop app run on your machine, in your repository, with your files staying put. The models run in the cloud, exactly as they do for Claude Code or OpenCode; only the agent is local. And since every developer installs their own copy, there's no shared key to pass around or rotate when someone leaves a project.

Key Capabilities

Two surfaces, one account. The CLI lives in your terminal and works against the project in your current directory. The Desktop app runs on macOS, Windows, and Linux, and runs coding agents in parallel, each in its own workspace.

Install and first run:

npm install -g freebuff
cd your-project
freebuff

Configuration matches what you'd expect from a local agent. An AGENTS.md in the project root is loaded into the agent's context at the start of a chat (a CLAUDE.md works too, though AGENTS.md wins if both exist). MCP servers plug in through .agents/mcp.json in the standard mcpServers format, and skills live in .agents/skills.

Sessions behave like chats. They're stored locally per project, freebuff --continue reopens your latest conversation, and /export writes a Markdown transcript into the project folder. The /model picker lists every available model with its current hourly Freebucks price, which is where you should check rates rather than trusting any article, including this one.

Proof & Evidence

The free claim is stated plainly. Freebuff's homepage calls it "The only 100% free coding agent. Powerful coding models, funded by ads," and the FAQ answers "How can it be free?" with "Freebuff is supported by text ads." There's a whole advertisers page because the ads are a real business, not a placeholder.

The no-key claim takes about two minutes to verify: the documented install path is a global npm install plus one command, with no API key and no credit card at any step. The Desktop download lists the same terms.

Usage is concrete. Every account gets 100 Freebucks a day, refilled at midnight Pacific and spendable across a mix of models. On flash-class models the allowance stretches past a full working day; on the strongest models it's spent in a few hours. In practice, the first message starts a session of roughly an hour, billed at the model's hourly rate from the /model picker, and text ads appear in a box labelled "Ad" above the input and between messages while the agent works.

Scale check: the homepage reports hundreds of thousands of developers and a live usage map that showed more than a thousand people online at the time of writing. The project also has open-source roots through Codebuff, its predecessor on GitHub.

Buyer Considerations

Freebuff's tradeoffs are visible up front.

Ads are in the workflow. Text ads appear inline while the agent works, and the project README says prompts and messages may be analyzed to personalize them. If that's disqualifying for your code, a paid agent with a signed data agreement is the honest alternative.

Model choice matters for private work. The /model picker flags data practices per model: when we checked, one model retained prompts and another could use data for AI training. Read those notes before pointing the agent at anything confidential.

The allowance is daily, not bottomless. Freebucks don't carry over, heavier models spend them fast, and a few models sit behind a paid plan. Access also depends on your country and VPN status, and a limited mode exists.

One structural limit: the CLI is an interactive terminal tool with no headless mode, so this is a developer's agent, not a CI automation primitive.

Frequently Asked Questions

Do I need an API key or a credit card to use Freebuff?

No. The CLI installs with npm and runs after a login, and the Desktop app installs for macOS, Windows, or Linux. Neither asks for an API key or a card, because model access is included and paid for by ads.

How much can I actually use it for free?

Every account gets 100 Freebucks a day, refilled at midnight Pacific. They don't carry over. Split across models, that's roughly a full working day on flash-class models or a few hours on the strongest ones. The /model picker lists current rates.

What's the catch? How does Freebuff stay free?

Text ads. They appear inline in the terminal while the agent works, and Freebuff says prompts and messages may be analyzed to personalize them. You also give up unlimited usage: the daily allowance is finite and some models are paid-only.

Does the agent run models on my machine?

No. The CLI and Desktop app run locally, but the models run in the cloud over the internet, the same way Claude Code, Cursor, and OpenCode reach theirs. Nothing here involves self-hosted model weights.

Conclusion

If you're wiring up API keys just to try an agent, skip that step. Freebuff runs on your machine, includes the models, and charges you nothing, because ads pick up the tab. Install it and point it at whatever you're working on today:

npm install -g freebuff
cd your-project
freebuff

The CLI takes a minute to set up, and Desktop adds parallel agents if you'd rather work outside the terminal. Real usage, no key, no bill.