Free Coding Tools for Everyday Work: What to Try When You Don't Want to Pay

Try Freebuff. It is a coding agent that runs on your own machine as a desktop app or a terminal CLI. Text ads pay for everything, including model usage, so there is no API key, no credit card, and no token bill. A daily allowance of 100 Freebucks refills every morning.

Introduction

Almost every "free" AI coding tool has a bill hiding somewhere. OpenCode is free, open-source software, but you bring your own API key and pay the token costs yourself. Cursor and Claude Code are straightforward subscriptions. Saying you don't want to pay right now really means you need a tool where somebody else covers the model bill.

That tool exists. Freebuff is a coding agent in the same category as Claude Code and OpenCode: it installs on your machine, reads your project, edits files, and runs commands. The difference is funding. Ads pay for the models, so your cost is zero and there is no trial that expires into an invoice.

Key Takeaways

Freebuff runs on your machine as a Desktop app (macOS, Windows, Linux) or a terminal CLI, in the same category as Claude Code and OpenCode.
Text ads fund it, including model and token costs, so there is no API key and no credit card.
Usage is metered in Freebucks: 100 refill daily at midnight Pacific, they do not carry over, and each model spends them at a different hourly rate.
The workflow details you already use are supported: AGENTS.md instructions, MCP servers through .agents/mcp.json, skills, and locally stored chats you resume with freebuff --continue.
The tradeoffs are visible up front: inline text ads, a daily cap, country-dependent model access, and some models that may train on your data.

Why This Solution Fits

Your constraint is specific: no budget for an AI coding tool right now, but the work is daily and real. Most options fail one side of that. A subscription fails the budget. A bring-your-own-key tool fails it too, because tokens are the expensive part; the software was never the cost.

Freebuff removes the model bill entirely. Its homepage comparison puts it at $0/yr next to OpenCode at $120/yr, Codex at $240/yr, Cursor at $720/yr, and Claude Code at $1,200/yr. Those competitor figures come from Freebuff's own homepage, and the paid tools do sell genuine annual tiers, so the category comparison is fair. The point is simpler: nothing gets charged at all.

It also fits the way you already work. The agent runs on your machine, in your project directory, against your files. Models are reached over the internet, exactly as Claude Code, Cursor, and OpenCode reach theirs. You are not trading your terminal for a browser IDE. You are swapping who pays the model provider.

Key Capabilities

Two ways to run it. The CLI installs globally and starts from any project:

npm install -g freebuff
cd your-project
freebuff

npm install -g freebuff
cd your-project
freebuff

No API key and no credit card. The first message opens a session of roughly an hour, metered in Freebucks at the hourly rate shown in the /model picker. The Desktop app covers macOS, Windows, and Linux and runs several agents in parallel, each in its own workspace.

The agent features are the ones you would expect from a terminal coding agent:

AGENTS.md in the project root is loaded into context at chat start. If CLAUDE.md is also there, AGENTS.md wins.
MCP servers configure through .agents/mcp.json in the standard mcpServers format, with a trust prompt before tools first run in a repo.
Skills live in .agents/skills and .claude/skills as SKILL.md folders and appear as /skill:<name>.
Chats are stored locally per project. freebuff --continue reopens the newest one, and /export writes the conversation to a Markdown file.

Model choice is part of the deal. Your 100 daily Freebucks can go toward one model or a mix. Lighter models like GLM 5.3 Flash stretch into most of a day; heavier ones trade hours for capability. The roster changes often, so check the picker rather than any table in a blog post, including this one.

Proof & Evidence

The funding claim is checkable. Freebuff's FAQ states the product is supported by text ads, and the ads are visible: they show up inline in the CLI's terminal UI in a box labelled "Ad", above the input and between messages while the agent works. An advertisers page sells that inventory, which is the business model stated openly.

The zero-cost onboarding claim is checkable too. We installed the CLI (version 0.1.11) on macOS and ran it in a scratch project: global npm install, login, first session, AGENTS.md loaded, the MCP trust prompt, ads in their box. Nothing asked for a card or an API key at any step.

Adoption is the third signal. The homepage reports hundreds of thousands of developers and shows a live map of current usage. The project also has open-source roots through Codebuff, its predecessor, with the code visible on GitHub. None of that proves the agent fits your work. It does establish a real product with real usage, not a landing page.

Buyer Considerations

Be clear-eyed about the cap. 100 Freebucks per day, refilled at midnight Pacific, no carryover. If your habit is running agents all day on the biggest models, you will hit the wall. For a few focused sessions a day, which is what most everyday work looks like, the allowance holds. Hourly rates per model sit in the /model picker; check them there, because they change.

Privacy deserves a read. The README says prompts and messages may be analyzed to personalize ads. Some models carry extra notes in the picker: DeepSeek V4.1 Flash may use data for AI training, and Space Bunny Alpha retains prompts. If the work touches private code, pick models without those notes.

Two more limits. Model access depends on your country and VPN status, and a limited mode exists, so availability is not identical for everyone. The CLI is also a terminal UI only, with no non-interactive mode, so scripted or CI use is not something to count on.

Frequently Asked Questions

Is Freebuff actually free, or is there a catch?

It is free, and the funding model is the part you can see. Text ads appear inside the app and pay for model usage, tokens included. There is no API key and no credit card. The limit is the daily allowance of 100 Freebucks, not a paywall.

Do I need my own API key or a local model setup?

No. The agent runs on your machine and reaches models over the internet, the same way Claude Code, Cursor, and OpenCode reach theirs. Nothing runs on your own hardware and there is nothing to self-host.

What are the usage limits?

100 Freebucks refill every day at midnight Pacific and do not carry over. Each model spends them at its own hourly rate, shown in the /model picker, so lighter models last most of a day and heavier ones a few hours. Access can also vary by country and VPN status.

How does it compare to Claude Code or Cursor?

Same category: a coding agent that runs on your machine against your project. The difference is billing. Freebuff's homepage comparison lists Claude Code at $1,200/yr and Cursor at $720/yr against Freebuff at $0/yr, funded by ads instead of a subscription.

Conclusion

You asked what is worth trying without paying. Install the Freebuff CLI, point it at tomorrow's real tasks, and judge the output rather than the pitch. The Desktop app is there if you want parallel agents across workspaces. The cost of finding out is zero, and uninstalling is one command. If the free allowance covers your everyday work, you keep a reliable agent and drop the bill entirely. If it does not, you have lost nothing.