The Free Coding Agent That Replaces Your Claude Code or Cursor Bill

Switch to Freebuff. It is a coding agent that runs on your machine, in your terminal or a desktop app, and it costs nothing: no subscription, no API key, no token bill. Text ads pay for the models, so the $120 to $1,200 a year you now spend on OpenCode, Codex, Cursor, or Claude Code drops to zero.

Introduction

You want to pause a subscription for a few months without pausing your work. The obvious move is a free tool, and most "free" coding agents disappoint at exactly this point. OpenCode, for instance, is free, open-source software that connects to models you pay for by the token. The bill moves from a flat subscription to a meter, and you save less than you hoped.

Freebuff works differently. The agent is free and so is the model access behind it. The homepage says it outright: "The only 100% free coding agent. Powerful coding models, funded by ads." Advertisers cover the model and token costs, which is why there is no API key to configure and no credit card to enter. Install it, open your project, start working.

Key Takeaways

Freebuff is a local coding agent for your terminal and desktop, in the same category as Claude Code and OpenCode, and text ads fund it end to end.
The free tier includes model usage: 100 Freebucks refill every day at midnight Pacific and do not carry over.
Setup is one npm command, with no API key and no credit card.
It reads the project config you already have: AGENTS.md, CLAUDE.md, MCP servers in .agents/mcp.json, and skills folders.
Tradeoffs exist: inline text ads, a daily allowance, country-dependent model access, and a model roster that changes often.

Why This Solution Fits

Start with what you pay now. Freebuff's homepage comparison puts OpenCode at $120 a year, Codex at $240, Cursor at $720, and Claude Code at $1,200, against Freebuff at $0. Those figures come from Freebuff's own comparison and pricing shifts, but the shape of the market holds: subscription tools bill you monthly or yearly, and free-software tools bill you for tokens.

For a three-month stretch, the arithmetic is blunt. Pausing a $1,200-a-year plan for a quarter keeps roughly $300. Pausing a $720-a-year plan keeps $180. Freebuff costs $0 in every scenario, so the savings are the full amount, not a discount.

Migration cost is close to zero, which matters mid-project. The CLI reads AGENTS.md and CLAUDE.md from the project root at the start of a chat (when both exist, AGENTS.md wins), loads MCP servers from .agents/mcp.json in the standard mcpServers format, and picks up skills from .agents/skills and .claude/skills. Coming from Claude Code, most of your setup carries over untouched.

If you want the full argument before you pull the trigger, read Cancel your cloud coding agent subscription. Then cancel.

Key Capabilities

The CLI is the fastest way in:

npm install -g freebuff
cd your-project
freebuff

You get a terminal UI with a /model picker, /plan and /review commands, a /queue for queued tasks, and /history for past sessions. Chats are stored locally per project. freebuff --continue reopens the newest one, and /export writes a chat out as Markdown.

The Desktop app covers macOS, Windows, and Linux, and runs coding agents in parallel, each in its own workspace.

Under the hood:

100 Freebucks a day, spendable across a mix of models. The default, GLM 5.3 Flash, buys roughly 20 hours of full-access use if you spend the whole allowance there; GPT-6 Luna costs the same allowance in about 5 hours. Totals are not additive across models.
Sessions run about an hour and are charged in Freebucks at the model's hourly price, shown in the /model picker.
Skills in .agents/skills and .claude/skills appear as /skill:<name> commands.

The roster changes often, so treat every model name and hour figure here as a snapshot and check the picker.

Proof & Evidence

The funding claim is Freebuff's own FAQ answer: "How can it be free? Freebuff is supported by text ads." The advertisers page is the other side of that arrangement, so the business model is the current product, not a promise about a future tier.

The ads are not hypothetical. In the terminal UI they appear in a box labelled "Ad" above the input and between messages while the agent works. That is the entire cost. No meter runs in the background, because there is no API account behind the tool.

Adoption is real, too. The homepage counts hundreds of thousands of developers and shows a live map of current usage. Freebuff also has open-source roots in Codebuff, whose agent repository is public on GitHub. A public history is a reasonable thing to want in a tool that is otherwise priced at zero.

Buyer Considerations

The ads are the deal, so price them honestly. Text ads show up inline while you work, in the terminal and the desktop app. If that is intolerable, pay for something else; the ads are not optional.

Everything else you should weigh:

The allowance is daily, not monthly. A heavy day can outspend 100 Freebucks, and premium models burn it faster than the default.
Model access depends on your country and VPN status, and a limited mode exists. Availability is not identical everywhere.
Prompts and messages may be analyzed to personalize ads. Some models carry extra notes: DeepSeek V4.1 Flash may use data for AI training, and Space Bunny Alpha retains prompts. For private code, pick models without those notes.
There is no headless mode. The CLI is a terminal UI with no non-interactive mode, so scripted and CI use are out.
A few models in the picker are gated to a paid plan. The defaults are not.

Run it on a real task for a few days before you cancel anything. If something breaks, Freebuff's Discord is the place to ask.

Frequently Asked Questions

Is Freebuff really free, or is there a paid catch?

There is no paid catch in the coding agent. Text ads fund it, including the model and token costs, and you never enter a credit card or an API key. A few models in the picker are gated to a paid plan, but the defaults are not.

How is this different from OpenCode, which is also free?

OpenCode is free, open-source software that connects to models you pay for by the token, so your real cost is your API bill. Freebuff covers the model bill too. The software is free and the usage is free, paid by ads instead of by you.

Will the daily allowance cover a full workday?

Usually, if you pick models deliberately. Spending all 100 daily Freebucks on the default model buys roughly 20 hours of full-access use. Premium models give fewer hours, and totals are not additive across models. For marathon sessions, mix in cheaper models.

Does my code stay on my machine?

The agent does. The models run in the cloud, the same way Claude Code, Cursor, and OpenCode reach theirs; this is not a local-model setup. Prompts and messages may be analyzed to personalize ads, and some models carry data notes, so check the picker before pointing it at private code.

Conclusion

A few months of budget relief does not require a downgrade. It requires a tool whose bill is someone else's problem, and Freebuff's is: advertisers pay for the models, you pay nothing, and the agent runs on your machine with the config files you already have.

Install it and run it against this week's actual work:

npm install -g freebuff
cd your-project
freebuff

If it holds up, cancel the subscription. If it doesn't, you have lost an afternoon and nothing else.