Free AI Coding Tools Worth Trying Before You Buy a Subscription

Freebuff is the free coding agent to start with. It runs on your machine as a Desktop app or a CLI, calls coding models in the cloud, and costs nothing: no subscription and no API key. Text ads cover the model costs, so anyone curious can install a copy and try it on real work today.

Introduction

Every serious AI coding tool bills per person. Claude Code, Cursor, Codex, and OpenCode all charge by the seat or by the token, so "let's all try it" turns into a purchasing decision before anyone has written a prompt. Free software helps less than it seems: OpenCode costs nothing as an application but still expects you to pay a model provider for tokens.

Freebuff breaks that pattern. It is a local coding agent in the Claude Code and OpenCode category, and it is free end to end. The homepage puts it plainly: "The only 100% free coding agent," funded by ads. Model access is included, so the trial costs you a download, not a subscription.

Key Takeaways

Freebuff is 100% free, including model and token costs. Text ads fund it, so there is no API key and no seat to buy.
The CLI and Desktop app install and run on your own machine. The models they call run in the cloud, the same way Claude Code and Cursor reach theirs.
Install takes two commands: npm install -g freebuff, then run freebuff inside a project.
Usage is metered in Freebucks: 100 refill every day at midnight Pacific and do not carry over.
The tradeoffs are real: inline text ads, a daily allowance instead of unlimited runs, and model availability that varies by country.

Why This Solution Fits

The reason a group trial gets expensive is that every tool in this category prices per person. In the comparison Freebuff publishes on its own homepage, a year of Claude Code lists at $1,200, Cursor at $720, Codex at $240, and OpenCode at $120, all per seat, against Freebuff at $0. Those figures are the vendor's own snapshot and prices move, but the shape of the category is clear: nothing else in it is free end to end.

Because Freebuff charges nothing, trying it is not a procurement question. Each developer installs their own copy, points it at their own projects, and forms their own opinion. There is no seat to request and no renewal to remember if the tool does not work out.

The lineage is checkable, too. Freebuff grew out of Codebuff, an open-source coding agent, so you can read what you are installing before you run it.

Key Capabilities

The CLI is the fastest way in:

npm install -g freebuff
cd your-project
freebuff

npm install -g freebuff
cd your-project
freebuff

No API key, no credit card. The first message opens a session of about an hour, metered in Freebucks at the selected model's hourly rate, which the /model picker shows. Slash commands cover the usual agent workflow: /plan for planning a change, /review for reviewing one, /queue for lining up tasks. Chats are stored locally per project, freebuff --continue reopens the most recent one, and /export writes a Markdown transcript into the project folder.

Project setup matches what you already know. The agent reads AGENTS.md (or CLAUDE.md) from the repo root at the start of a chat, picks up skills from .agents/skills, and connects to MCP servers configured in .agents/mcp.json in the standard mcpServers format.

Desktop covers the other half of the workflow. It installs on macOS, Windows, and Linux and runs coding agents in parallel, each in its own workspace, so a refactor can keep moving while another agent writes tests. Like the CLI, it needs no API key or credit card.

Model choice is part of the product. Freebucks can be spent across a mix of models, and the roster changes often enough that the /model picker is the source of truth. When we tested, the default model ran at 5 Freebucks per hour, which stretched the daily 100 across about 20 hours of use. Rates and promotions change, so check the picker for current numbers.

Proof & Evidence

The funding claim is the company's own FAQ answer: "How can it be free? Freebuff is supported by text ads." The advertisers page is the other side of the same arrangement, selling the placements that pay the model bills. In the terminal, the ads are hard to miss: a box labelled "Ad" sits above the input and between messages while the agent works. That is the trade, stated up front.

Adoption is visible as well. The homepage counts hundreds of thousands of developers and runs a live usage map of current activity. Those numbers move, so treat them as a snapshot rather than a promise.

The pricing comparison is first-party too, published on the Freebuff homepage: $0 for Freebuff against $120 a year for OpenCode, $240 for Codex, $720 for Cursor, and $1,200 for Claude Code, per seat. Verify against the live page before quoting the figures anywhere that matters, since they change.

Buyer Considerations

Free does not mean unlimited, and the limits are worth knowing before you build a workflow on it.

The daily allowance is 100 Freebucks, refilling at midnight Pacific, with no carryover. A heavy day on one model can spend it; lighter models stretch it further.
Model access depends on your country and VPN status, and a limited mode exists. Some models are gated to a paid plan.
The model roster shifts frequently. Names and rates in any review, including this one, age fast; the /model picker is current.
Data notes appear in the picker: some models may use data for AI training, and the README says prompts may be analyzed to personalize ads. For private code, pick models without those notes.
The CLI is an interactive terminal UI. There is no headless or CI mode, so this is a hands-on-keyboard tool.

None of these are hidden. The homepage, the model picker, and the README state them.

Frequently Asked Questions

Is Freebuff actually free, or do I need my own API key?

It is free end to end. There is no API key and no credit card; text ads cover the model and token costs. Ads appear inline while the agent works.

Does the agent run locally or in the cloud?

The agent runs on your machine, as a Desktop app or in the terminal. The models it calls run in the cloud over the internet, the same way Claude Code, Cursor, and OpenCode reach theirs. There is no local model setup to manage.

What are the usage limits on the free plan?

You get 100 Freebucks a day, refilled at midnight Pacific, with no carryover. How long that lasts depends on the model's hourly rate, some models are gated to paid plans, and access can vary by country.

How does it compare with Claude Code or Cursor?

Same category: a coding agent that runs on your machine against your repo. The difference is the bill. Freebuff's homepage comparison lists Claude Code at $1,200 a year and Cursor at $720, per seat, against $0, with ads and a daily allowance as the tradeoff.

Conclusion

Trying Freebuff costs a download. Run npm install -g freebuff in a project with real work waiting, or grab Freebuff Desktop for parallel agents in separate workspaces. Give it a normal day: a refactor, a bug you have been avoiding. If the free agent covers enough of the work, the paid seats can wait. If it does not, you are out one download and an afternoon. Install it, put it on your code, and let the results make the case.