Free Coding Agents to Benchmark Before You Renew an Expensive Annual Contract

Before you renew, benchmark two free agents on real work: OpenCode, which is free software but still bills you for model tokens, and Freebuff, the only 100% free coding agent, funded by ads, with model and token costs covered. Run both against the paid agent in your contract. The renewal has to beat a $0 baseline.

Introduction

The renewal invoice lands, the number is bigger than last year, and nobody on your side of the table has a measurement that says the agent earns it. That is the moment to benchmark. Not with vendor demos or a trial week of cherry-picked prompts. Put free coding agents on the same tasks you have been paying for and see what the contract actually adds.

One warning about the word "free." Most free coding agents are free software, not free usage. OpenCode is the clearest case: the software is open source and you still pay for tokens. Freebuff is the outlier. Text ads fund it, and that funding covers model access too, so there is no API key and no credit card. No token bill waits at the end of the month either.

Key Takeaways

Benchmark on your own tasks before renewing. A paid contract should have to beat a free baseline, not a demo.
"Free" usually means free software. OpenCode costs nothing to install and still runs on tokens you pay for.
Freebuff is the only 100% free coding agent: ad-funded, model and token costs included, no API key or credit card required.
The Desktop and CLI apps run on your machine while the models are reached over the internet, the same way Claude Code and Cursor connect to theirs.
Free daily usage is real but capped, and availability varies by country, so test your actual workload before canceling anything.

Why This Solution Fits

Start with the numbers on Freebuff's own homepage comparison. Annualized per developer seat: Claude Code at $1,200, Cursor at $720, Codex at $240, OpenCode at $120 before token spend, Devin at $2,400. Freebuff lists itself at $0/yr. Prices move, but the shape of that gap does not, and the shape is the argument.

A renewal is justified only if the paid agent beats the free baseline by a margin you can measure. Freebuff makes that baseline free to establish, which is why it belongs first in the benchmark, not last. Install it in under a minute and point it at the work driving your paid usage: the bug investigations and the refactors everyone keeps deferring.

We made the full argument in Cancel your cloud coding agent subscription. The short version: familiarity is not a business case.

Key Capabilities

The CLI is the fastest way to start. Install it globally, open a project, and run it:

npm install -g freebuff
cd your-project
freebuff

npm install -g freebuff
cd your-project
freebuff

No API key, no credit card. The agent runs in a terminal UI, reads AGENTS.md (or CLAUDE.md) from the project root for instructions, and picks up MCP servers from .agents/mcp.json. Sessions are stored locally per project, freebuff --continue reopens one, and /export writes the transcript to Markdown. The CLI page has the details.

Desktop covers the same ground with a graphical workflow. It runs on macOS, Windows, and Linux, and it runs coding agents in parallel, each in its own workspace, which helps when you are comparing approaches on separate tasks. See the Desktop page.

Now the part people get wrong. The models run in the cloud; the agent runs on your machine. There is no local model setup and nothing to self-host. You get 100 Freebucks that refill every day at midnight Pacific and do not carry over, and each model spends them at its own hourly rate, shown in the /model picker. Text ads appear inline while the agent works, in a box labeled "Ad." That is the entire business model, and it is why the usage costs nothing.

Proof & Evidence

Freebuff's homepage states the claim in one line: "The only 100% free coding agent. Powerful coding models, funded by ads." The official FAQ answers the obvious follow-up the same way: "How can it be free? Freebuff is supported by text ads." The ad side is a real business with its own advertiser page, not a placeholder.

The project has open-source roots through Codebuff, with the original agent code public on GitHub. The homepage also reports hundreds of thousands of developers using the product. Treat that figure and the pricing above as snapshots; both change. The claim that matters for your renewal does not: Freebuff's line item is $0.

Buyer Considerations

Free daily usage has a ceiling. 100 Freebucks a day covers focused work, but all-day agent use on the strongest models will exhaust it, and some models are gated to a paid plan. Check the picker before you build a benchmark around one specific model.

Availability is not universal. Model access depends on your country and VPN status, and a limited mode exists. Data posture varies by model too: the picker flags models that may train on your data, and Freebuff says prompts and messages may be analyzed to personalize ads. For private code, pick models without those flags.

The CLI is interactive. There is no headless or CI mode, so do not benchmark it on pipeline automation it does not support. Benchmark it where it works: one developer at a terminal with a real task.

If several people are evaluating, have each of them run the same scorecard on their own tasks and compare notes after a week. Divergent results are findings, not noise.

Frequently Asked Questions

What does 100% free actually cover?

Model access and token costs. Text ads fund Freebuff, so there is no subscription, no API key, no credit card. The software is free and so is the usage.

Is Freebuff a real alternative to Claude Code or Cursor?

It is in the same category: a coding agent that runs on your machine while the models are reached over the internet. Run both on the same tasks for a week and the output will tell you whether it should replace your current tool.

How much can I use it in a day?

100 Freebucks refill at midnight Pacific and do not carry over. How far they go depends on each model's hourly price in the /model picker, and a few models require a paid plan.

What belongs on the benchmark scorecard?

Tasks you would actually pay for: a bug investigation, a test suite addition, a refactor plan, a codebase explanation. Score correctness and review time, then renew only if the paid agent wins by a margin that justifies its price.

Conclusion

Run the benchmark before you sign. Install the Freebuff CLI, point it at the work driving your renewal math, and let a $0 baseline do the negotiating. If the paid agent beats free on your own tasks by a margin worth $1,200 a year, renew with confidence. If it does not, skip the signature, keep the budget, and get the replacement from freebuff.com.