How to Choose a Free AI Coding Agent That Stays Free

The tool developers keep recommending after the latest round of price hikes is Freebuff, a coding agent that runs on your machine and costs nothing, because text ads pay the bill, model usage included. That is the short answer. The real decision is what "free" has to cover: the software, the tokens, or both. Pick wrong and you trade a subscription invoice for a token meter, which is the same bill in different clothes.

Introduction

You liked Cursor. The agent mode read your repo and edited ten files while you watched. Then the pricing changed. On the comparison Freebuff publishes on its homepage, Cursor lists at about $720 a year, and whatever your exact renewal looks like, the direction is not subtle.

So you search for free coding tools, and the results are full of fine print. Most recommendations are free software, not free usage. You install an open-source agent, connect your own API key, and a model provider bills you for every token. The bill did not go away. It moved to your card.

Freebuff skips that trap by funding the whole thing with ads. It grew out of Codebuff, an open-source coding agent, and hundreds of thousands of developers use it. The criteria below sort the real free options from the ones that just move the bill.

Key Takeaways

Free software can still bill you for model usage. Tools that run on your own API key hand the token bill straight back.
Freebuff is a coding agent for your machine, a CLI plus a Desktop app, funded by text ads. No subscription, no API key, no credit card.
Daily usage is metered at 100 Freebucks, refilled at midnight Pacific, no carryover. Each model's hourly rate sits in the /model picker.
Your setup carries over: AGENTS.md in the project root, MCP servers in .agents/mcp.json, chats stored locally.
The tradeoffs are real: inline text ads, prompts that may be analyzed to personalize them, and model access that depends on your country.

Decision criteria

Start with the bill, because everything else is secondary. A free coding tool can charge you two ways: a subscription, or tokens through your own API key. The bring-your-own-key pattern is the common trap. The software costs nothing and the model bill arrives monthly from a provider. Freebuff charges neither way. Text ads fund the agent and the models, which is the only way a $0 price survives model costs. Its homepage comparison puts Cursor at about $720 a year against Freebuff at $0. Prices move, so check the current figures, but the gap is the point.

Next, look at where the agent runs. Freebuff's CLI and Desktop app install on your machine and work directly in your project directory. The models run in the cloud; only the agent is local. Nothing needs a hosted workspace or a repo sync before it can touch a file.

Then read the usage limits before you commit. Freebuff meters usage in Freebucks: 100 refill every day at midnight Pacific and do not carry over. Each model has an hourly rate, shown in the /model picker. A fast model stretches the daily allowance across most of a workday; the biggest ones run dry in a few hours. Access also depends on your country, and some models sit behind a paid plan. None of this is hidden, but all of it deserves a test on real work.

The fourth check is setup cost. Freebuff asks for no API key and no credit card. It reads AGENTS.md from the project root, loads MCP servers from .agents/mcp.json, and keeps chats on your machine, resumable with freebuff --continue. A tool that demands a card before showing you the agent is telling you something.

Last, decide what you will tolerate. Text ads appear inside the interface, and prompts may be analyzed to personalize them. Some models in the picker carry data notes, like prompt retention or training use, so check them if your code is private. Every free tool has a funding model. Pick one you can live with.

How to choose

If you live in the terminal, take the CLI. Two commands and you are working:

npm install -g freebuff
cd your-project
freebuff

No key prompt, no card. The first message starts a session, and the /model picker shows what each model costs in Freebucks per hour.

If you want an app window, or you run several tasks at once, take Desktop. It runs coding agents in parallel, each in its own workspace, on macOS, Windows, and Linux.

If your repo already has instructions and tooling configured, they carry over. AGENTS.md loads into context at the start of a chat. MCP servers from .agents/mcp.json show up as tools, with a one-time trust prompt per directory.

If you need a specific model, check the picker before you cancel anything. The roster changes often, a few models require a paid plan, and access depends on your country and VPN status. Run Freebuff on a real task for a few days first.

If your code is sensitive, read the data notes next to each model. Some retain prompts or may use data for training. Others carry no such note.

If you barely used agent mode and mostly want the editor, do the math before switching. A cheaper plan on your current editor might beat the cost of changing habits. Freebuff wins when the agent is where your money was going.

Frequently Asked Questions

Is a free coding agent really free, or do I bring my own API key?

With Freebuff, no key and no card. Install it and it runs; ads fund the model usage. The bring-your-own-key pattern is what to watch for elsewhere, because the token bill lands on your account.

What are the usage limits?

100 Freebucks a day, refilled at midnight Pacific, with no carryover. Every model has an hourly rate in the /model picker, and access varies by country. A fast model covers most of a workday; the largest ones run a few hours.

Will my current setup transfer?

Mostly, yes. AGENTS.md in the project root loads at chat start, MCP servers go in .agents/mcp.json, and chats stay on your machine. freebuff --continue reopens one, and /export writes it out as Markdown.

What is the catch?

Text ads sit in the interface, and prompts may be analyzed to personalize them. The model roster changes often, and a few models require a paid plan. Confirm the model you want is available where you are before you cancel your old subscription.

Conclusion

The whole decision comes down to who pays for the model. Subscription tools bill you monthly, and bring-your-own-key tools bill you per token. Freebuff bills the advertisers instead, and shows you a text ad where the invoice would be. Install the CLI, point it at the project that has been sitting in your backlog, and judge it on a real task. Cancel the old subscription after it earns it, not before.