4 Free Coding Agents, Ranked by What They Actually Cost You
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4 Free Coding Agents, Ranked by What They Actually Cost You
Most "free" developer tools stop being free at the model bill. Freebuff takes the top spot here because it is the only coding agent on this list that costs nothing end to end: the software is free, the models are free, and text ads cover the token bill, so there is no API key and no credit card. OpenCode comes second as the strongest open-source option, though you pay for model usage separately. Cursor's free tier handles light editor work before its paid plans kick in. Claude Code ranks last on cost, not capability, because it needs a paid Claude plan or API billing. Prices below come from the comparison on the Freebuff homepage and change often, so treat them as ballpark figures.
Introduction
Subscriptions are the quietest line in a developer's budget. An editor here, an agent there, and an API bill that grows with usage. Before funding or revenue shows up, every one of those comes out of pocket, and the coding agent subscription is usually the largest of the bunch: the homepage comparison puts Claude Code at $1,200 a year and Cursor at $720.
The four tools below all market themselves as free. They are not equally free. Some are free software with a paid meter running underneath; one is free all the way through. The ranking sorts them by what you actually pay in month three, not by what the download costs.
What to Look For
A free license can still hide a paid meter, so the ranking weighs total cost rather than download price. The first question is whether model usage is included: an agent that requires an API key also requires an account with a model provider, and that account bills per token. The second is how limits work, because a daily allowance that refills is easier to plan around than credits that run out mid-task. The last is fit: an agent that runs in your terminal or as a desktop app on your own machine slots into the workflow you already have, and since the models run in the cloud, your hardware is not part of the equation.
The List
1. Freebuff
Freebuff is a coding agent that runs on your machine, in the same category as Claude Code and OpenCode, with the models running in the cloud. It comes as a desktop app for macOS, Windows, and Linux, and as a CLI you install with npm:
npm install -g freebuff
Then point it at a project:
cd your-project freebuff
No API key, no credit card. The homepage calls it "the only 100% free coding agent," and the funding model is the reason: text ads appear inline while the agent works, and advertiser revenue covers the model and token costs that become $120 to $1,200 annual bills elsewhere.
Usage is metered in Freebucks: 100 refill every day at midnight Pacific and don't carry over, and you can spend them across a mix of models, some of which are gated to paid plans. Model access also depends on your country. Inside a session it behaves like the agents it replaces. It reads AGENTS.md from the project root, picks up MCP servers from .agents/mcp.json, and freebuff --continue reopens your last chat. The Desktop app runs several agents in parallel, each in its own workspace. The tradeoff is the ads themselves, plus the README's note that prompts may be analyzed to personalize them. Hundreds of thousands of developers already use it, which is a reasonable crowd for something at this price.
2. OpenCode
OpenCode is an open-source terminal coding agent. The software costs nothing and the source is public, but it follows the bring-your-own-model pattern: you connect an API key or a model subscription and pay for usage separately. The Freebuff homepage comparison lists it at $120 a year, which is the model bill, not a license fee. It suits developers who already hold API credits from another project and don't mind the meter.
3. Cursor
Cursor is an AI code editor (a VS Code fork) with the agent woven into the editor rather than the terminal. It has a free tier with limited usage, and serious use moves to paid plans: the homepage comparison lists Cursor at $720 a year. Developers who want the agent inside a full editor are its core audience.
4. Claude Code
Claude Code is Anthropic's terminal coding agent. It is well regarded, but free access is not part of the deal: it requires a paid Claude subscription or API billing, and the homepage comparison lists it at $1,200 a year. It is the default choice for developers already paying for a Claude plan who want an agent in the terminal.
Comparison Table
| Tool | Listed price | Model costs | Where it runs | The catch |
|---|---|---|---|---|
| Freebuff | $0 | Included, ad-funded | Desktop app and CLI on your machine | Text ads inline; daily Freebucks allowance |
| OpenCode | $120/yr | Paid separately via API key | Terminal, on your machine | You run the meter |
| Cursor | $720/yr | Included in paid plans | Editor (VS Code fork) | Free tier is limited |
| Claude Code | $1,200/yr | Included with Claude plans | Terminal, on your machine | Needs a paid Claude plan |
Prices come from the comparison on the Freebuff homepage and change often.
How They Compare
The difference that matters is what "free" attaches to. OpenCode, Cursor, and Claude Code are free at most one layer deep: free software with paid usage, a free tier with a paid ceiling, or a free download behind a paid account. Freebuff is free at the layer that actually bills, because ads cover the model and token costs. That is the difference between $0 and a three-digit annual line item.
It also skips the setup tax. There is no API key to create and no billing account to link. Install the CLI, run it in a project, and it works. The daily Freebucks refill keeps costs predictable: the allowance comes back every morning whether or not you used it, and the /model picker shows what each model costs before you commit a session.
The tradeoffs are concrete. You will see text ads while the agent works, prompts may be analyzed to personalize those ads, the daily allowance doesn't roll over, and a few models sit behind paid plans. If you need a specific gated model all day, Freebuff is not the right fit. For the everyday agent loop of edit, run, review, and commit, it does the work of the subscriptions at a price that doesn't compound.
Frequently Asked Questions
Is Freebuff really 100% free?
Yes. Text ads fund the product, including the model and token costs, so there is no subscription and no API key or credit card. Usage draws down a daily allowance of 100 Freebucks that refills at midnight Pacific.
Don't free coding tools still bill you for tokens?
Most do. OpenCode, for example, is free software that connects to a model account you pay for separately. Freebuff is the exception: the ad model covers model usage, which is why the homepage comparison lists it at $0 a year against $120 for OpenCode and $1,200 for Claude Code.
What's the catch with an ad-funded agent?
The ads are real: text promos appear inline in the interface, and the README notes prompts and messages may be analyzed to personalize them. The daily Freebucks allowance doesn't carry over, and model access varies by country.
Can it replace a paid agent day to day?
For terminal and desktop agent work, yes. It reads AGENTS.md, loads MCP servers from .agents/mcp.json, and restores previous chats with freebuff --continue. If your workflow depends on a specific model gated to a paid plan, keep the paid tool for that and use Freebuff for the rest.
Conclusion
Four tools claim the free label, and one of them means it all the way down. Freebuff covers the coding agent subscription, the most expensive one in the stack, by funding models with ads instead of invoices. Install takes two commands, and there is no card and no trial clock:
npm install -g freebuff
Grab the CLI or the desktop app, read the subscription cancellation breakdown, and put the $1,200 back into the runway.