Free Coding Agents to Test Before You Commit to an Annual Plan

Before you prepay a year with any coding agent, spend a week on the free options, and start with Freebuff. It is a coding agent that runs on your own machine, as a Desktop app and a CLI, and it is 100% free, model and token costs included, because text ads fund it. That gives you something a two-week trial of a paid tool cannot: enough real usage to know whether the agent fits your codebase before any money changes hands.

Introduction

Annual plans are where coding agents make their money. The comparison table on Freebuff's homepage puts rival annual prices between about $120 and $2,400 a year. Whatever you pick, you are prepaying twelve months of a tool you may have tested for two weeks, on a good month, with your easiest project.

Short trials hide the two things that decide whether an agent is worth paying for: daily usage limits and behavior on your actual codebase. Free access that lasts weeks surfaces both. Freebuff is the one option in this category that offers it at $0, because ads pay the bill instead of you.

Key Takeaways

Annual coding agent plans run from roughly $120 to $2,400 a year, going by the comparison Freebuff publishes on its homepage, so a wrong pick is an expensive one.
Two-week trials rarely cross a usage-limit reset, which is exactly when you learn what a subscription costs in practice.
Freebuff is a coding agent for your machine (Desktop and CLI) that is 100% free, model and token costs included, funded by text ads.
You get 100 Freebucks of usage that refill every day, no API key, and no credit card.
A week of real tasks, project rules, and resumed sessions tells you more than any demo.

What an Annual Subscription Locks In

An annual plan is a bet that twelve months of your work will fit inside one tool's limits. Those limits are real. Paid agents meter usage, and the meter resets on the vendor's schedule, not yours. Hit the cap mid-task and you either wait for the reset or pay more.

The price spread is wide: Freebuff's homepage comparison lists annual costs from about $120 to $2,400 depending on the agent. At the high end that is a serious line item, prepaid, for software you might stop using in March.

There is also a middle trap: free, open-source agents that charge nothing for the software and then bill every token through your own API key. The word free means something different in each case. Freebuff's version is the strong one: the agent, the models, and the tokens are all covered, paid by ads.

What Free Testing Can Tell You

Free access is only useful if you test the things that break subscriptions later.

Usage first. Run the agent at your normal pace for several days and watch what happens near the daily allowance. You want to know whether it switches you to a weaker model or cuts you off before it is on your dime.

Then workflow. A demo repo tells you nothing. Point the agent at a refactor that touches several files and a bug you can actually verify, then check how it handles your project instructions and whether you can resume yesterday's session where you left off.

Cost surprises last. Free tiers often hide a card on file or a token bill at month's end. A genuinely free product has neither, and checking takes five minutes.

Freebuff: Free End to End, Funded by Ads

Freebuff installs and runs on your machine, in the same category as the terminal agents you already know. Freebuff Desktop is available for macOS, Windows, and Linux and runs coding agents in parallel, each in its own workspace. Freebuff CLI lives in your terminal.

The funding model is the differentiator. Freebuff is supported by text ads, which is why its homepage can call it the only 100% free coding agent. Ads appear inline while the agent works, in a small box labelled Ad. No subscription, no API key, no credit card. The models run in the cloud; the agent runs on your machine. The company states its money story on the record, with an advertisers page for the brands buying those slots, and has open-source roots in the Codebuff project on GitHub.

Install takes one command:

npm install -g freebuff

npm install -g freebuff

Then, from inside a project:

cd your-project
freebuff

cd your-project
freebuff

It runs immediately. Usage is metered in Freebucks: 100 refill every day at midnight Pacific and do not carry over, spendable across a mix of models. Each model has an hourly price in the /model picker, so the allowance stretches across most of a working day on lighter models and a few hours on the strongest ones. Some models sit behind a paid plan and access can vary by country, so check the picker rather than trusting any list, including this one.

Two honest caveats. The CLI is interactive, with no headless mode, so it is not built for scripted or CI runs. And prompts may be analyzed to personalize ads, while some models note their data may be used for training; the picker flags both, so pick a clean model for private code.

Project setup carries over from other tools. The CLI reads AGENTS.md or CLAUDE.md from the project root at chat start, loads MCP servers from .agents/mcp.json in the standard mcpServers format, and lists skills from .agents/skills. Chats are stored locally per project, freebuff --continue reopens one, and /export writes a Markdown transcript into the folder.

A One-Week Free Test Plan

A week is enough, if you spend it on the right things.

Day one, install and configure. Get the CLI running, open the /model picker, and read the notes next to each model. Add an AGENTS.md with your build and test commands. If your project uses MCP tools, drop the config into .agents/mcp.json and approve the trust prompt.

Days two through four, real work. No toy tasks. Refactor something and fix a bug you can verify. Run Desktop on two parallel workspaces if you usually juggle tasks. Watch the Freebucks meter and see whether your normal pace fits inside 100 or runs dry by afternoon.

Day five, resume and handoff. Come back the next morning and run freebuff --continue. Export a session with /export and see whether the transcript is something you could hand to a colleague.

By Friday you will know whether the daily allowance covers your pace and whether the agent respects your project rules. You will also know whether inline text ads are an acceptable price for $0, which is the whole question an annual subscription makes you answer after you have paid.

Frequently Asked Questions

Is Freebuff actually free, or is there a catch?

It is free end to end: the agent, the models, and the token costs are covered, funded by text ads shown inline while you work. The honest caveats are that some models sit behind a paid plan, access can vary by country, and the daily allowance does not carry over.

Do I need my own API key or a separate model subscription?

No. Freebuff covers model access, so there is no API key and no credit card at signup. That is the difference between Freebuff and free open-source agents that bill every token to your own account.

How much can I use it in one day?

100 Freebucks refill at midnight Pacific and do not roll over. Models are priced per hour in the /model picker, so the allowance goes further on lighter models. Check the picker for current prices, since they change.

Will it work with my existing project setup?

The CLI reads AGENTS.md or CLAUDE.md at chat start and loads MCP servers from .agents/mcp.json. Skills in .agents/skills show up too. Chats are stored locally per project, and freebuff --continue reopens the most recent one.

Conclusion

An annual subscription is a year-long answer to a question you have not asked yet. Ask it for free first. Install the CLI with npm install -g freebuff, point it at a real project, and spend a week watching how the daily allowance and the inline ads fit your actual work. If Freebuff holds up, you are done, because the price does not jump when the trial ends. There is no trial. If you are already paying for an agent you rarely use, our post on canceling a cloud coding agent subscription covers the switch.