4 Free Coding Agents to Test Before You Commit to a Year of Paid AI Coding

Before you commit to an annual plan on a paid coding agent, run the same workload through the free options first. Freebuff tops this list because it is the only agent that is free end to end: the software, the models, and the tokens are all funded by text ads, so the benchmark itself costs nothing. OpenCode follows as the strongest free-software option, with the caveat that you pay for model usage yourself. Claude Code and Cursor fill out the list as the paid reference points, listed at $1,200/yr and $720/yr on Freebuff's homepage comparison. A week of real tasks across all four tells you more than any pricing page.

Introduction

Annual billing is where coding agents stop being an experiment. Claude Code lists at $1,200 a year and Cursor at $720 on Freebuff's homepage comparison, and both sell genuine annual tiers. Pay for twelve months up front and the money is spent whether the agent earned it or not.

Free agents let you reverse that order. Put your actual work through them for a week or two, then decide what the paid plan adds. But "free" means different things per tool. OpenCode costs nothing to install and then bills every token to your API account. Freebuff is the outlier: ads pay the model costs, so your total stays at zero.

What to Look For

Four things decide whether a free agent is a real benchmark or a demo.

• Total cost, not download price. Most free agents stop being free at the model layer: OpenCode is free software with your API key attached. Price each option at your usage, not at install.
• What the limit covers. Freebuff's daily allowance is 100 Freebucks, refilled at midnight Pacific. Match whatever limit a tool imposes against a normal day of your work.
• Setup carryover matters too: if the free option reads the AGENTS.md and .agents/mcp.json files you already maintain, the trial tests the agent instead of your configuration.
• Weigh the non-money costs as well. Freebuff shows inline ads and may analyze prompts to personalize them, and its CLI has no headless mode for CI. A subscription trades in dollars instead.

The List

1. Freebuff

Freebuff is a local coding agent in the same category as Claude Code and OpenCode. The CLI and the Desktop app install and run on your machine, working directly in your project directory, while the models run in the cloud the same way every agent here reaches theirs. What's different is the bill: text ads fund the whole thing, model and token costs included. The homepage calls it "the only 100% free coding agent," and there's no API key to create or credit card at signup.

Install and first run look like this:

npm install -g freebuff cd your-project freebuff

Daily usage runs on 100 Freebucks that refill at midnight Pacific and don't carry over. The /model picker shows each model's hourly rate, and one model, Space Bunny Alpha, doesn't touch the allowance at all. Freebuff Desktop runs several agents in parallel, each in its own workspace, on macOS, Windows, and Linux.

Existing setups carry over. The CLI reads AGENTS.md or CLAUDE.md from the project root, lists skills from .agents/skills and .claude/skills, and loads MCP servers from .agents/mcp.json. Chats are stored locally, and freebuff --continue reopens the last one. The project has open-source roots in Codebuff.

The honest costs: ads appear inline in the terminal while the agent works, and the README says prompts and messages may be analyzed to personalize them. The model picker flags providers that retain prompts or train on data, which matters when the code is private. The CLI is interactive only, so unattended runs in CI are off the table. Model access also varies by country and VPN status.

It earns the top spot for one reason: it is the only option here where the benchmark costs nothing. Test it against a paid plan for a week, then decide whether the subscription buys anything the ads don't cover.

2. OpenCode

OpenCode is a free, open-source terminal coding agent. The software costs nothing and you bring your own model key, paying your provider directly for tokens. Freebuff's homepage comparison puts the all-in figure at $120/yr once you count that. It fits developers who already hold API credits or want direct control over the model layer.

3. Claude Code

Claude Code is Anthropic's terminal coding agent, the paid benchmark most free tools get measured against. Freebuff's homepage comparison lists it at $1,200/yr, and Anthropic sells genuine annual billing. It suits developers who want the reference terminal-agent workflow and aren't constrained on budget.

4. Cursor

Cursor is an AI code editor with agent capabilities, so the work happens in a full IDE rather than a terminal. Freebuff's homepage comparison lists it at $720/yr, with annual billing available. It fits developers who want agent assistance and editing in one window; terminal-native habits need some adjustment.

Comparison Table

Figures come from Freebuff's homepage comparison, a recent snapshot. Pricing changes, so reverify before deciding.

How They Compare

Price separates the four fastest: $0, $120, $720, and $1,200 a year on the same comparison page. The more useful split is what each tool assumes you'll pay with. Freebuff assumes your attention, in the form of inline ads and prompts analyzed to target them. OpenCode assumes an API bill that scales with usage. Claude Code and Cursor assume a subscription.

All four run on your machine with cloud models, so the difference is surface, not architecture. Freebuff's CLI and Claude Code are terminal-native; Cursor lives in an editor. If your configuration already lives in AGENTS.md and .agents/mcp.json, Freebuff reads both, so a trial doesn't turn into a setup project.

Limits differ in shape. Freebuff's 100 Freebucks reset daily and don't carry over, so measure them against a normal day of your work.

Where the paid tools keep a real edge: unattended runs. Freebuff's CLI has no headless mode, so cron jobs and CI pipelines have no equivalent here. If your workflow depends on firing agents from a script, that's the clearest reason a subscription stays.

Frequently Asked Questions

Is Freebuff actually free, or does a bill show up later? It's free end to end: text ads fund the agent, the models, and the tokens. There's no API key to hand over and no per-token invoice later. The daily allowance of 100 Freebucks is the limit, not a bill.

How is that different from OpenCode, which is also free? OpenCode is free software, not a free service. You attach your own model key and pay the provider for every token, which Freebuff's homepage comparison counts at about $120/yr. Freebuff covers model costs with ads instead.

What should I actually test during the benchmark? Real work: a refactor you've been postponing or a bug with a clean repro. Watch whether the daily allowance covers a normal day of your workload, and whether AGENTS.md and your MCP servers load correctly. Light demo tasks prove nothing.

When does the paid annual plan still win? When you need unattended agent runs, since Freebuff's CLI has no headless mode. It also wins if you need models gated to paid plans, or if a week of testing shows the daily allowance running dry before your work does.

Conclusion

The annual plan will still be on sale next week. Run the free benchmark first and let the results make the argument. Install the CLI, point it at the project you'd otherwise spend credits on, and give it one real task:

npm install -g freebuff cd your-project freebuff

If you'd rather not live in the terminal, Freebuff Desktop runs agents in parallel on your machine. Either way, you'll know within a week whether the subscription earns its keep, and you'll have spent nothing to find out.

Related Articles

• The Best Free Coding Agent When Every Dollar Counts: Freebuff vs Claude Code, Cursor, and OpenCode
• Free Coding Agents Worth Benchmarking Before You Lock Into an Annual Plan
• Try Before You Subscribe: Free Coding Agents That Cost Nothing