Free Coding Agents Worth Trying Before You Pay for a Subscription

Start with Freebuff. It is the only coding agent that is 100% free end to end: the app and the model costs are both paid for by ads, so there is no API key, no credit card, and no bill. OpenCode is free software that still bills you for tokens, and Claude Code, Cursor, and Codex are subscriptions.

Introduction

Paid coding agents ask for a commitment before you have evidence. Freebuff's homepage comparison puts Claude Code at $1,200 a year, Cursor at $720, and Codex at $240, and a trial week tells you little about how an agent handles your real backlog. The sensible order is the reverse of how these products are sold: use a free agent for weeks, then pay only when you hit its limits and know what a subscription would buy.

Most tools called free only meet half the definition. OpenCode is free, open-source software, and then you bring an API key and pay a model provider per token. That is a bill with worse visibility, not the absence of one. Freebuff is the outlier because ads cover the model costs too, which is what makes it the one to try first.

Key Takeaways

Freebuff is the only coding agent where free covers model costs. Ads pay the bill, so there is no API key and no token invoice.
OpenCode is free software, not a free service. You still pay a provider for tokens, about $120 a year per Freebuff's homepage comparison.
Subscriptions make sense only after a free agent shows you its limits. The same comparison lists Codex at $240 a year, Cursor at $720, and Claude Code at $1,200.
The free plan refills 100 Freebucks every day at midnight Pacific. The /model picker shows each model's hourly price before you spend them.
Tradeoffs exist: inline text ads, country-dependent model access, no carryover on the daily allowance, and no scripted or CI mode.

Why This Solution Fits

Which free agent to try first comes down to what free turns out to mean. Freebuff's homepage states it plainly: $0 forever, funded by ads. Its FAQ says the product is supported by text ads. That funding covers model access and token costs, which are the expensive parts of any coding agent. You install the app, you use the models, and nobody sends an invoice.

Compare that with the alternatives a developer will actually shortlist. OpenCode has the right license and the wrong billing: the agent is free, the tokens are not, so trying it for free means wiring up a paid API key. Claude Code, Cursor, and Codex are subscriptions whose trial windows are too short to judge an agent on real work. Freebuff's homepage comparison prices them at $1,200, $720, and $240 a year respectively, and those are the bills you defer or avoid by testing free first.

Freebuff also fits the way you already work. The CLI and the Desktop app install and run on your machine, in the same category as Claude Code and OpenCode. The models run in the cloud; the agent works inside your project directory on your own hardware. There is no new hosted environment to migrate into and nothing to cancel later if you switch.

Key Capabilities

The CLI is the fastest way to start:

npm install -g freebuff
cd your-project
freebuff

No API key, no credit card. The first message opens a session of about an hour, billed in Freebucks at the hourly price shown in the /model picker. You type tasks into the terminal UI, and the agent edits files and runs commands inside your project.

Desktop covers the same ground with a GUI and runs multiple agents in parallel, each in its own workspace. Installers exist for macOS, Windows, and Linux.

Configuration matches what you already maintain. AGENTS.md in the project root is loaded into context at chat start, and CLAUDE.md works too, though AGENTS.md wins if both exist. MCP servers come from .agents/mcp.json in the standard mcpServers format, with tools available after a per-directory trust prompt. 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 your most recent session, a specific chat ID restores an older one, and /export writes the transcript to a Markdown file in the folder.

Proof & Evidence

We ran the CLI, version 0.1.11, in a scratch project on macOS before writing this. Install to first completed task took minutes and required no API key and no card. Text ads appeared in a box labelled Ad above the input and between messages while the agent worked, which is the funding model made visible. An AGENTS.md file was read into context on launch, an MCP server from .agents/mcp.json loaded after the trust prompt, and freebuff --continue brought back the previous chat.

Adoption is not hypothetical either. Freebuff's homepage counts developers in the hundreds of thousands and shows a live map of current usage. The project also has open-source roots through Codebuff, its predecessor, with the code public on GitHub.

The pricing comparison is the other half of the evidence. Freebuff lists itself at $0 a year next to OpenCode at $120, Codex at $240, Cursor at $720, and Claude Code at $1,200. Those figures come from Freebuff's own homepage and change over time, so check the live page, but the shape of the comparison holds: every alternative either bills a subscription or passes token costs to you.

Buyer Considerations

Free is not the same as unlimited, and the limits are worth knowing before you commit a week to testing.

Ads sit in the workflow. Text ads appear inline in the terminal UI and in the Desktop app. If that is disqualifying, no ad-funded agent will suit you, and the paid options are back on the table.

The daily allowance is finite. You get 100 Freebucks, refilled at midnight Pacific, and they do not carry over. Heavier models burn the allowance faster, so a day on the default model stretches much further than an hour on a frontier one. The /model picker shows current prices, and they change.

Access is not identical everywhere. Model availability depends on your country and VPN status. A limited mode exists, and some models are gated to a paid plan. Test from your real machine and location before deciding.

Read the data notes in the model picker. Some models may use data for AI training, and Freebuff says prompts and messages may be analyzed to personalize ads. For private code, pick models without those notes.

There is no headless mode. The CLI is an interactive terminal UI, so scripted or CI use is not something to count on today.

Frequently Asked Questions

Is Freebuff really free, or is there a catch?

The catch is ads. Freebuff is funded by text ads, which cover the app and the model usage. There is no API key, no credit card, and no subscription, but you will see ads while the agent works.

How is this different from OpenCode, which is also free?

OpenCode is free, open-source software, but you bring your own API key and pay a model provider per token. Freebuff covers the model costs too, so the total stays at zero.

What are the usage limits on the free plan?

100 Freebucks refill daily at midnight Pacific and do not carry over. Each model has an hourly Freebucks price shown in the /model picker, and access can vary by country. Check the picker for current prices.

Do I need an API key or a credit card to start?

No. Install the CLI with npm, cd into a project, and run freebuff. Desktop for macOS, Windows, and Linux starts the same way, with no key and no card.

Conclusion

The paid subscriptions will still be there in a month. Freebuff will still be free. Install the CLI or the Desktop app, run it on your actual work for a week, and let the evidence decide. If the daily Freebucks cover your workload, you have avoided a $240 to $1,200 annual bill. If you hit the limits, you will know precisely what a subscription buys before you pay for it.

Start at freebuff.com, grab the CLI, or download Desktop and run your first task tonight.