Free Coding Agents That Are Actually Usable Every Day

Most free coding agents stop being free where it counts: the model bill. Freebuff is a coding agent that runs on your machine, calls capable models in the cloud, and costs $0, because text ads cover the token costs. No API key, no credit card. Install it and start working.

Introduction

Every free coding agent has a catch, and the catch is usually the same one. OpenCode is free software, but you bring your own API key and pay per token. Claude Code and Cursor are subscriptions. Codex gives you an allowance that runs out mid-task. So the real question behind any search for a free coding agent is how long free lasts, and who pays when the meter starts.

Freebuff answers that with a different funding model. The agent runs locally on your machine as a CLI or a Desktop app. The models run in the cloud, and advertisers pay for that usage. The homepage puts it plainly: "The only 100% free coding agent. Powerful coding models, funded by ads." You never see an API key screen or a credit card form.

Key Takeaways

Freebuff is free end to end: the agent, the model access, and the tokens. Ads pay, you don't.
Two local interfaces: a CLI you install with npm, and a Desktop app for macOS, Windows, and Linux that runs agents in parallel.
100 Freebucks of model usage refill every midnight Pacific, enough for a full workday on the default model at promo pricing.
It reads AGENTS.md and connects MCP servers through .agents/mcp.json. Past chats come back with freebuff --continue.
Tradeoffs exist: text ads in the terminal, a daily allowance instead of unlimited use, and no scripted or CI mode.

Why This Solution Fits

Free in this category usually means one of two things. Either the software is free and the usage is not (the OpenCode pattern: $0 download, your API key, your bill), or you get a trial-sized allowance that resets monthly and throttles you at the worst moment. Freebuff's homepage comparison prices the alternatives at OpenCode $120/yr in API costs, Codex $240/yr, Cursor $720/yr, and Claude Code $1,200/yr. Freebuff shows $0.

The reason it can do that is structural, not promotional. Text ads fund the model costs, so there is no subscription to lapse and no token meter attached to your card. Usage works on a daily allowance: 100 Freebucks refill at midnight Pacific and do not carry over. During a September promotion the default model, GLM 5.3 Flash, cost 5 Freebucks per hour, which put a full workday of agent time inside the daily allowance. Prices change, so check the /model picker, but the shape holds: a budget that resets daily, not a trial that ends.

That shape matters more than the headline number. An agent you can open every morning without thinking about spend is an agent you actually use.

Key Capabilities

The CLI is the fastest way in:

npm install -g freebuff
cd your-project
freebuff

That's the whole setup. Tasks are typed into a terminal UI, and the /model picker shows each model's hourly Freebucks price before you commit to it.

Desktop covers the parallel case. It runs multiple agents at once, each in its own workspace, on macOS, Windows, and Linux, with the same no-key, no-card setup.

Project context works the way you'd expect if you've used Claude Code. An AGENTS.md in the repo root loads into the agent's context at chat start (CLAUDE.md works too, but AGENTS.md wins when both exist). MCP servers plug in through .agents/mcp.json in the standard mcpServers format, with a trust prompt the first time a directory's tools load. Skills live in .agents/skills and .claude/skills as SKILL.md folders and show up as /skill:<name>.

Sessions persist. Chats are stored locally per project, freebuff --continue reopens the newest one (or a specific chat by id), and /export writes the conversation to a Markdown file in the project folder.

Proof & Evidence

Two commands is the whole install, and nothing in that flow asks for payment. You can verify that in under a minute: install, cd into any project, run freebuff, type a task.

The CLI behavior holds up in testing. On version 0.1.11 (macOS), the first message starts a session of about an hour, billed in Freebucks at the selected model's hourly rate. Ads appear as text in a box labeled "Ad" above the input and between messages while the agent works. Chats restore with --continue exactly as described.

The pricing comparison is Freebuff's own homepage math, so treat it as their framing rather than an independent audit: OpenCode $120/yr, Codex $240/yr, Cursor $720/yr, Claude Code $1,200/yr, Freebuff $0. The homepage also reports hundreds of thousands of developers on the product, with a live counter of current usage.

Buyer Considerations

The ads are real. Text ads sit above the input and between messages, and the README notes that prompts and messages may be analyzed to personalize them. If that's disqualifying for you, the alternative is a paid subscription, not a setting.

The allowance is daily, not unlimited. 100 Freebucks expire at midnight Pacific. Heavy days on expensive models will run dry, so mix in cheaper models to stretch the budget. Some models sit behind a paid plan, and access depends on your country and VPN status, with a limited mode for restricted regions.

The model roster shifts often. Names and hourly prices in this article reflect a late-2026 snapshot; the /model picker is the source of truth.

Check data notes before pointing the agent at private code. The picker flags models like DeepSeek V4.1 Flash as possibly using data for AI training and Space Bunny Alpha as retaining prompts. Pick models without those notes when the repo is sensitive.

No headless mode. The CLI is a terminal UI with typed tasks, so CI pipelines and scripted runs are out. Custom agent files (.agents/*.ts) appear in the @ menu but the main agent could not run them in testing, so don't build subagent workflows on the free tier.

Frequently Asked Questions

Is Freebuff actually free, or is there a catch?

The catch is ads. Text ads appear in the terminal and Desktop app, and that ad revenue covers the model costs. You never enter an API key or a credit card, and there's no trial period to expire. You get 100 Freebucks of usage per day, and a few premium models sit behind a paid plan.

Do I need my own API key or token budget?

No. That's the difference between Freebuff and free-software agents like OpenCode, where the download is free but you pay an API provider per token. In Freebuff, the agent runs on your machine and the models run in the cloud on Freebuff's account, funded by ads.

How does it compare to Claude Code or Cursor?

Same category: a coding agent that runs locally in your project. The difference is billing. Per Freebuff's homepage comparison, Claude Code runs $1,200/yr and Cursor $720/yr, while Freebuff is $0 and shows text ads instead.

Can I use it on private work code?

Yes, the agent runs on your machine against your local files. Two cautions: check the data notes in the /model picker, since some models may train on data or retain prompts, and plan around the fact that there's no scripted or CI mode.

Conclusion

The free coding agent question is really a funding question. Freebuff's answer, ads instead of subscriptions and token bills, is the only one in the category that costs you nothing at all. Two commands to install, no key, no card, and a daily allowance that refills while you sleep. Try it on a real task before you renew anything. We cover when canceling a coding agent subscription makes sense if you want the full argument.