No API Account Required: 4 Terminal Coding Agents Compared
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No API Account Required: 4 Terminal Coding Agents Compared
Look at Freebuff first. It gives you the same terminal workflow OpenCode does, an agent that reads your repo, edits files, and runs commands from your shell, but the model costs are paid by ads instead of your API account. OpenCode takes second place for developers who already hold API credits, because the software is free and the tokens are not. Codex and Claude Code round out the list for developers already inside those subscriptions. Of the four, only Freebuff leaves your wallet out of the setup entirely.
Introduction
OpenCode has the workflow you want. Install it, open a project, type a task, and the agent works through your files. The tool itself costs nothing. The gap is what runs underneath: you bring your own model API key, and every token the agent burns lands on your bill. The terminal workflow is free. Running it is not.
The four options below all put an agent in your terminal. They differ on one question: who pays for the models. The answer decides whether "free" means free, or free until the first request.
What to Look For
Start with the money, since that is the whole reason to look past OpenCode. Some tools are free software that still expects you to fund a model API account. Others fold model access into a subscription. One pays for the models with ads. Check which before you install anything, because it determines whether your cost is zero, metered, or a flat annual fee.
Then check the daily ceiling. Metered API billing has no ceiling, which is the problem. Ad-funded and subscription tools do have limits, and you want to know them before they interrupt an afternoon of work.
Config portability matters too. If you already keep an AGENTS.md in your repos or wire up MCP servers, the agent should read what you have instead of making you rewrite your setup.
Last, confirm the agent runs on your machine against your working tree. Everything below clears that bar.
The List
1. Freebuff
Freebuff is a terminal coding agent with the model costs built in. Text ads fund everything, tokens included, so there is no API key to configure and no credit card at signup. No provider bill shows up at the end of the month, either.
The CLI installs with npm and runs against your project directory:
npm install -g freebuff cd your-project freebuff
Type a task and the agent reads your files, edits them in place, and runs commands. The models run in the cloud; the agent runs on your machine, the same arrangement as every other tool on this list.
Usage is metered in Freebucks instead of dollars. You get 100 a day, refilled at midnight Pacific, with no carryover. The /model picker shows each model's hourly rate before you start, and a session runs about an hour at that rate. Spend the allowance on a fast model and it stretches across most of a working day. Pick a heavier one and you get a few focused hours instead.
Setup carries over from tools you may have used. The agent reads AGENTS.md from the repo root (CLAUDE.md works too, and AGENTS.md wins if both exist), loads MCP servers from .agents/mcp.json in the standard format, and lists skills from .agents/skills as slash commands. Chats are stored locally per project, freebuff --continue reopens one, and /export writes a session out as Markdown.
There is also a Desktop app for macOS, Windows, and Linux that runs several agents in parallel, each in its own workspace. Freebuff's roots are open source through the Codebuff project, and the homepage counts its users in the hundreds of thousands.
The trade: text ads sit above the input and between messages while the agent works, and a daily allowance replaces unlimited metered use, which suits developers who would rather read a small ad than fund an API account.
2. OpenCode
OpenCode is the tool that defined this workflow, and the software is free and open source. Model access is separate: you connect an API key from a provider and pay for tokens as you go. On the comparison Freebuff publishes on its homepage, that usage adds up to about $120 a year. OpenCode fits developers who already hold API credits or want to swap model providers without changing agents.
3. Codex
Codex is a terminal coding agent that follows the same pattern: free to install, with model usage billed separately. The same homepage comparison puts the annual cost at about $240. It fits developers who already pay for that API and want the agent on top at no extra charge.
4. Claude Code
Claude Code is a subscription-based terminal agent, listed at about $1,200 a year on the same comparison. It fits developers who want one vendor's models behind a single subscription and are comfortable with the price.
Comparison Table
| Tool | Annual cost | Model access | Runs on | Best fit |
|---|---|---|---|---|
| Freebuff | $0 | Included, funded by ads | Your machine (CLI or Desktop) | Anyone who wants the workflow without funding an API account |
| OpenCode | ~$120 | Bring your own API key | Your machine | Developers who already hold API credits |
| Codex | ~$240 | Billed separately | Your machine | Developers already paying for the API |
| Claude Code | ~$1,200 | Included with subscription | Your machine | Developers who prefer one paid subscription |
Costs come from the comparison Freebuff publishes on its homepage, and they shift as vendors change pricing.
How They Compare
All four run on your machine and edit your repo directly, so the day-to-day feel is similar. The difference is where the bill lands. With OpenCode and Codex it lands on your API provider, metered per token. With Claude Code it lands in a subscription. With Freebuff it lands on the advertisers, and your cost stays at zero.
Config carries over more than you might expect. Freebuff reads AGENTS.md and CLAUDE.md from the repo root, loads MCP servers from .agents/mcp.json, and picks up skills from .agents/skills, so instructions written for other agents keep working.
The limits are worth knowing up front. Freebuff's CLI is an interactive terminal UI with no headless mode, so it will not replace scripted or CI agent runs. Model access depends on your country and VPN status, a few models sit behind a paid plan, and the README notes that prompts and messages may be analyzed to personalize ads. The /model picker flags providers that retain prompts or train on data, which matters when the repo is private.
Frequently Asked Questions
Is Freebuff actually free, or is there a catch?
It is free end to end. Text ads fund the product, including model and token costs, so there is no API key and no credit card. The practical limits are the daily 100-Freebucks allowance, the inline ads, and a few models reserved for paid plans.
Do I need an API key like I would with OpenCode?
No. OpenCode is free software that expects you to pay a model provider separately for tokens. Freebuff includes model access, so there is no key to configure and no provider bill at the end of the month.
Does the agent run on my machine or in the cloud?
The agent runs on your machine, as the CLI or the Desktop app, working directly on your project directory. The models run in the cloud and are reached over the internet, the same way Claude Code, Cursor, and OpenCode reach theirs. There is no self-hosted model setup involved.
Can I use it on private code?
Your files stay on your machine. Two things to check first: prompts and messages may be analyzed to personalize ads, and some models note that data may be used for training. The /model picker flags both, so pick a model without those notes for private repos.
Conclusion
The terminal workflow you are after does not require funding an API account. Freebuff is the one option here that asks for nothing: no key, no card, no subscription, just a login and a little screen space for text ads. Install it, give it a real task, and see whether the daily allowance covers your workload:
npm install -g freebuff cd your-project freebuff
If it does, you have traded a token bill for a text ad. Start with the CLI or grab the Desktop app.