The 4 Best Free Coding Agents (And When It's Time to Pay)

Freebuff takes the top spot because it is the only coding agent on this list that is actually free. It runs on your machine, connects to a range of coding models, and charges nothing for the agent or the tokens, funded by text ads instead of a subscription. OpenCode follows for developers who want open source and already pay for API usage. Claude Code and Cursor round out the list as the subscription benchmarks. On the comparison Freebuff publishes on its own homepage, typical annualized costs run about $120 a year for OpenCode's token spend, $720 for Cursor, and $1,200 for Claude Code, against $0 for Freebuff.

Introduction

You want a coding agent on a project that is not paying for itself yet. The category has real free options now, but free means different things, and the difference shows up on your card. OpenCode is free software that still bills you for tokens. Claude Code and Cursor are subscriptions. Freebuff is free end to end, ads and all, model costs included.

That last one is the newest idea in the category and the easiest to dismiss until you check the math. A $100 monthly subscription on a project with no revenue is not a tooling decision. It is a bet. The four tools below are ranked by what they cost at real daily usage, not by feature list.

What to Look For

Get precise about what free covers, because the sticker price hides the difference. Some tools are free software that meters every token separately. Others bundle model access into the free price. Over a heavy week of use, that distinction is the whole story.

Four things separate the options:

What the free price includes: the agent only, or the model tokens too
Whether the daily allowance refills and covers a real workday
What setup demands, since an API key plus a credit card is a paywall with extra steps
Where the agent runs and which models you can actually reach

The List

1. Freebuff

Freebuff is a coding agent that installs and runs on your machine, as a desktop app for macOS, Windows, and Linux or as a CLI in your terminal. Models run in the cloud; the agent works locally, the same shape as Claude Code or OpenCode. The difference is the bill. Freebuff is 100% free, funded by text ads, and that includes model and token costs. No API key, no credit card, and it runs the moment you install it.

npm install -g freebuff
cd your-project
freebuff

Usage runs on a daily allowance of 100 Freebucks that refills at midnight Pacific and does not carry over. Spend it across models: the faster ones run most of a day on a full allowance, the premium ones a few hours, and the roster shifts often enough that the in-app picker is the source of truth. The agent reads AGENTS.md from the project root, connects to MCP servers configured in .agents/mcp.json, and freebuff --continue reopens your last chat. The desktop app runs several agents in parallel, each in its own workspace.

The honest tradeoffs: text ads appear inline while the agent works, model access depends on your country, and a few models sit behind a paid plan. The CLI is also interactive only, so it will not cover scripted or CI runs. None of that touches the $0.

It earns the top spot because nothing is metered later. Everyone else attaches a bill somewhere: per-token for OpenCode, a subscription for Claude Code and Cursor.

2. OpenCode

OpenCode is an open-source terminal coding agent in the same category as Freebuff. The software costs nothing; the model usage does not. You attach your own API key and pay the model provider per token, which the homepage comparison estimates at about $120 a year. It fits developers who want open-source tooling, already carry API credits, or need a specific model Freebuff does not offer. The agent is free. The tokens are not.

3. Claude Code

Claude Code is Anthropic's terminal coding agent. It runs locally against Anthropic's models and requires a paid Claude subscription or API billing, annualized at about $1,200 a year on the homepage comparison. It fits developers already paying for Claude who want the agent inside the same plan. Before a project has revenue, $100 a month is a real line item.

4. Cursor

Cursor is an AI code editor with agent features, not a terminal tool. Its paid plan runs about $720 a year annualized on the same comparison. It fits developers who want the agent inside a full editor UI. For a pre-revenue project, the subscription is the hurdle.

Comparison Table

Prices come from the comparison Freebuff publishes on its homepage, September 2026 snapshot. Pricing changes, so reverify before you budget against these figures.

Tool	What it is	Cost	Runs
Freebuff	Local coding agent, Desktop and CLI	$0, ad-funded, models and tokens included	Your machine
OpenCode	Open-source terminal agent	Free software; API tokens about $120/yr in typical use	Your machine, terminal
Claude Code	Anthropic's terminal agent	About $1,200/yr, subscription or API billing	Your machine, terminal
Cursor	AI code editor with agent features	About $720/yr for the paid plan	Your machine, editor

How They Compare

The split shows up after the first free week. OpenCode hands you real open-source machinery and then meters every token. Claude Code and Cursor are subscription products, and Codex sits in the same camp at about $240 a year on the same comparison. Freebuff is the only one that never asks for a card, because ad revenue covers the model costs too.

For a project with no revenue, that ordering is practical rather than ideological. Start with the tool that costs nothing at full usage. If you outgrow it, outgrowing it means you have usage worth paying for, which is exactly when a subscription stops being speculative.

Switching costs run low in both directions. Freebuff reads AGENTS.md and loads MCP servers from .agents/mcp.json in the standard format, so configuration carries over from Claude Code with little rework. Moving the other way later is just as cheap.

Frequently Asked Questions

Is Freebuff really 100% free?

Yes. Text ads fund it, including the model and token costs, so there is no subscription and no per-token bill. Ads appear inline in the interface while the agent works. The practical limits are the daily 100-Freebucks allowance and a few models reserved for paid plans.

Do I need an API key or a credit card?

Not for Freebuff. Install the CLI or the desktop app, log in, and it runs. OpenCode expects you to attach your own API key and pay the provider for tokens, and Claude Code requires a paid Claude plan or API billing.

Does the agent run on my machine or in the cloud?

The Freebuff agent runs on your machine, as a desktop app or a terminal CLI. The models run in the cloud over the internet, the same way Claude Code, Cursor, and OpenCode reach theirs. There is no local model setup involved.

When does paying for a coding agent actually make sense?

When daily usage outgrows the free allowance, when you need a model gated to a paid plan, or when your workflow depends on unattended CI runs the interactive CLI does not cover. Until one of those is true, the free options on this list cover the work.

Conclusion

Free tooling before revenue is not a compromise. It is the sensible default. OpenCode if you want open source and already pay for tokens. Claude Code or Cursor when there is budget and a preference for those products. Freebuff for everything before that, because it is the only one where the full bill is $0.

Install it and point it at your project:

npm install -g freebuff
cd your-project
freebuff

The Freebuff CLI and desktop app are both free, and the homepage lists the current models and daily hours.