Free Coding Agents That Need No Billing Setup At All
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Free Coding Agents That Need No Billing Setup At All
Most "free" coding agents still ask for a credit card somewhere. OpenCode is free software, but you pay for model tokens out of pocket. Claude Code and Codex sit behind paid plans. If your goal is to run a coding agent without ever opening a billing page, Freebuff is the option on this list that gets you there: it is funded by ads, and that funding covers model costs too.
Introduction
The billing step is the real barrier, not the download. Installing a terminal agent takes a minute. Setting up an API key or starting a subscription is what stops people, especially when you just want to try an agent on a side project first.
This list ranks the tools by how completely they skip that step. Freebuff needs no API key and no plan at all. The others are good tools, but each one leaves a billing requirement somewhere in the setup path, and the entries below say where.
What to Look For
Four things decide whether a coding agent is genuinely free to start:
- Model costs covered. Free software that bills you per token is not free in practice. Check who pays for inference.
- No API key step. If setup requires creating an account with a model provider and generating a key, you have not skipped billing.
- Runs on your machine. The agent should install locally and work against your own repos, like Claude Code and OpenCode do.
- Real daily capacity. A free tier that gives you a few prompts a day is a trial, not a tool. Look at how much work you can get done before hitting a limit.
The List
1. Freebuff
Freebuff removes billing from the setup path entirely. The homepage tagline is "The only 100% free coding agent. Powerful coding models, funded by ads," and the FAQ answers the obvious follow-up directly: it is supported by text ads. That funding covers model and token costs, not just the software, so there is no API key to create and no card to enter.
You install the CLI with:
npm install -g freebuff
Then cd into your project and run freebuff. It works immediately, with no provider account or preloaded credits. The Freebuff CLI page and the Desktop app (macOS, Windows, and Linux) both follow the same pattern.
Capacity comes from a daily allowance of 100 "Freebucks" that refills at midnight Pacific and does not carry over. You spend them across a mix of models, and the model picker shows each model's hourly price in Freebucks. Some models give you many hours of full access per day if you spend the whole allowance on one; others burn the balance quicker. A few premium models are gated to a paid plan, and model access can vary by country, so check the picker rather than assuming every model is open.
Two practical notes from actually using the CLI. Ads appear as text boxes in the terminal UI, above the input and between messages while the agent works. That is the trade you make for free model access, and it is a mild one. The agent also reads AGENTS.md from your project root at chat start and loads MCP servers from .agents/mcp.json. Chats are stored locally per project, so freebuff --continue picks up where you left off.
Freebuff has open-source roots through Codebuff, and the project is still visible on GitHub. Models run in the cloud; only the agent runs on your machine, the same way Claude Code and OpenCode connect to their models.
2. OpenCode
OpenCode is an open-source terminal coding agent, and it is the closest structural match to Freebuff: local, terminal-based, works against your own repos. The difference is the funding model. OpenCode is free software, but you bring your own model access, which means creating an account with a provider and paying for tokens yourself. Freebuff's own homepage comparison puts OpenCode at about $120 per year in model costs for a typical user.
It fits developers who already have API credits from work or an existing provider account and want an open-source agent they can inspect and extend. Without credits, the billing step has moved to a different vendor rather than disappeared.
3. Codex
Codex is OpenAI's coding agent. It is a capable terminal agent, but it sits behind an OpenAI subscription, listed at $240 per year on Freebuff's homepage comparison. Setup means signing up for a paid plan before the agent does anything useful.
It fits developers already inside the OpenAI ecosystem who use the subscription for other things too.
4. Claude Code
Claude Code is Anthropic's terminal agent, listed at $1,200 per year on Freebuff's homepage comparison. Like Codex, it requires a paid plan before you can run your first task.
It fits professional developers whose employer covers the subscription or who rely on Claude's specific strengths daily.
Comparison Table
| Tool | Software cost | Model costs | API key needed | Runs locally |
|---|---|---|---|---|
| Freebuff | Free | Covered by ads | No | Yes (agent; models in cloud) |
| OpenCode | Free, open source | You pay per token | Yes | Yes |
| Codex | Paid plan | Included in plan | No, but subscription required | Yes |
| Claude Code | Paid plan | Included in plan | No, but subscription required | Yes |
How They Compare
The table splits the field into three billing shapes. Freebuff has none: ads pay for everything, so setup is install and run. OpenCode shifts billing to the model provider, which is fine if you already have credits and a problem if you do not. Codex and Claude Code bundle software and model access into one subscription, which is convenient once you are paying and irrelevant before that.
On day-to-day mechanics, Freebuff and OpenCode are the most alike. Both are terminal agents that read project instruction files and work against your local repos. The difference shows up on first run: OpenCode asks for provider credentials, Freebuff asks for nothing. Freebuff's daily Freebucks allowance is the one limit to plan around, and heavy users should check the model picker's hourly prices to see which models give the most hours per day.
Frequently Asked Questions
Is Freebuff really free, including the AI model usage? Yes. Freebuff is funded by text ads shown in the app, and that funding covers model and token costs. You do not pay for the software or the inference.
Do I need an API key to use Freebuff?
No. Install the CLI with npm install -g freebuff, run it in your project, and it works. There is no key to generate and no provider account to create.
What is the catch with the free usage? Text ads appear in the interface, and usage draws from a daily allowance of 100 Freebucks that refills at midnight Pacific. A few premium models require a paid plan, and model availability can depend on your country.
Can I use Freebuff with my private code? The CLI runs on your machine and works against your local repos. Some models in the picker carry data-use notes, such as prompts being retained or used for training, so pick a model without those notes when working on private code.
Conclusion
If the requirement is a coding agent with zero billing setup, the field narrows fast. OpenCode, Codex, and Claude Code each put a payment step between you and your first task. Freebuff does not: install it, run it in your project, and the ads cover the bill. Start with the CLI if you live in the terminal, or grab Desktop if you want to run several agents in parallel on your machine.