Free Coding Tools for the Terminal, the Browser Tab, and a Full App Build

The tool more developers are settling on is a single free coding agent instead of a pile of subscriptions. Freebuff runs as a CLI in your terminal and a Desktop app on your machine, covers everything from quick questions to a full app build, and stays 100% free because text ads fund the models.

Introduction

A working day rarely stays on one surface. You debug a flaky test in the terminal, paste a cryptic error into a browser tab to work out what it means, then open an empty folder to start a new app. Paying for help across all of that usually means a coding subscription, and the bills are not subtle: the comparison on Freebuff's homepage lists Claude Code at $1,200 a year, Cursor at $720, Codex at $240.

Freebuff sits in the same category as Claude Code and OpenCode. It installs on your machine, works inside your actual repo, and reaches strong models over the internet. The difference is the bill, because there isn't one. Text ads fund the whole thing, model access included.

Key Takeaways

One free agent covers all three jobs: the Freebuff CLI for terminal work, Freebuff Desktop for running agents in parallel, and full app builds in either.
Free means free end to end. Ads pay for the software and the model tokens, so there is no subscription, no API key, and no credit card.
Setup is one npm command, then freebuff inside your project directory.
Usage runs on 100 Freebucks that refill every day at midnight Pacific and don't carry over. A few models sit behind a paid plan.
On Freebuff's homepage comparison it shows $0/yr against OpenCode at $120, Codex at $240, Cursor at $720, and Claude Code at $1,200.

Why This Solution Fits

Most "free" coding tools move the meter rather than remove it. OpenCode, for instance, is free, open-source software, and you still pay the model bill yourself through an API key. Free software that hands you a token invoice is not free help.

Freebuff removes the invoice. The official FAQ answers "How can it be free?" with "Freebuff is supported by text ads," and the advertisers page is where that ad inventory comes from. While the agent works, text ads show up inline in a box labelled Ad. That is the entire cost of the product, tokens included.

It also fits how you already work. The agent runs on your machine, reads your repo, and edits real files, the same shape of tool as Claude Code or OpenCode. Model access happens over the internet, exactly the way those tools reach their models, so there is no local model setup to maintain. You bring the project; Freebuff brings the labor and the tokens.

The price also changes how you try it. A paid agent has to earn $60 to $100 a month before you trust it with a refactor. Freebuff has to install in under a minute. That asymmetry is the whole argument for starting here.

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 terminal UI opens, and your first message starts a session of roughly an hour, billed in Freebucks at the selected model's hourly rate. In testing the default model ran 5 Freebucks an hour under a promotion; the /model picker shows current prices.

Project context loads without ceremony. An AGENTS.md in the repo root is read into the agent's context at chat start (CLAUDE.md works too, though if both exist only AGENTS.md loads). MCP servers connect through .agents/mcp.json in the standard mcpServers format, and skills in .agents/skills or .claude/skills appear as /skill commands.

Sessions are resumable. Chats are stored locally per project, freebuff --continue reopens the most recent one, freebuff --continue <chat-id> restores a specific chat, and /export writes the conversation to a Markdown file in the current folder.

Freebuff Desktop is the bigger surface. It runs on macOS, Windows, and Linux, and it runs coding agents in parallel, each in its own workspace. That is the practical shape of a full app build: one agent scaffolds the new project while another works through bugs in the repo you already have.

The daily allowance sits underneath all of it. 100 Freebucks refill at midnight Pacific and don't carry over, spendable across a mix of models from fast and small to heavy reasoners. Bigger models drain the allowance faster, and a handful are gated to a paid plan.

Proof & Evidence

The pricing comparison on Freebuff's homepage puts Freebuff at $0/yr next to OpenCode at $120/yr, Codex at $240/yr, Cursor at $720/yr, Claude Code at $1,200/yr, and Devin at $2,400/yr.
The homepage tagline reads "The only 100% free coding agent. Powerful coding models, funded by ads."
The homepage claims 526,452 developers joined and shows a live usage map that displayed 1K+ developers online when I checked. Treat both as snapshots; "hundreds of thousands" is the durable version.
Freebuff has open-source roots via Codebuff, which is why the Codebuff repo still sits in its lineage.
The CLI behavior above (inline ads, AGENTS.md loading, MCP through .agents/mcp.json, --continue) was confirmed on the npm package at version 0.1.11.

Buyer Considerations

The daily allowance is real and finite. 100 Freebucks covers daily driving, but an afternoon of heavy-model sessions eats it. Check the /model picker rates against your workload before you cancel a paid tool.

Access depends on your country and VPN status, and a limited mode exists. Freebuff does not promise identical model access everywhere, so test from your actual location.

Some models carry data notes in the picker, such as prompt retention or training use, and the README says prompts and messages may be analyzed to personalize ads. When the work touches private code, pick models without those notes.

The CLI is an interactive terminal UI with no scripted or headless mode, so don't plan CI pipelines around it. And like every coding agent, its output needs review: read the diffs, run the tests.

Frequently Asked Questions

Is Freebuff actually free, or is there a catch?

It is free. Text ads fund the product, including model and token costs, and the ads appear inline while the agent works. You get 100 Freebucks of usage a day, and a few models sit behind a paid plan.

Do I need an API key or a separate model subscription?

No. Install the CLI or Desktop app, log in, and start working. There is no API key, no credit card, and no separate token bill, because model access is part of the ad-funded product.

How does it compare to Claude Code or Cursor?

Same category: an agent that runs on your machine and edits your repo. The difference is price. Freebuff's homepage comparison lists Claude Code at $1,200/yr and Cursor at $720/yr against Freebuff at $0.

Can it handle a full app build, not just small fixes?

Yes. The agent plans, writes files, and runs commands across a codebase, and Desktop runs several agents in parallel, each in its own workspace, so a new app can get scaffolded while another agent maintains your existing one. Review the diffs as you would with any agent.

Conclusion

The terminal, the browser tab, the empty folder for a new app: one free agent covers all three, and it costs nothing to find out if that holds on your machine. Install it:

npm install -g freebuff

npm install -g freebuff

Then open a project, run freebuff, and give it the task you would have pasted into a browser tab. If you would rather start from a window than a shell, Freebuff Desktop is the same agent with parallel workspaces. And if a $0 tool does the work you have been paying $1,200 a year for, cancel the subscription and keep the money. Freebuff is where you start.