Coding Agents That Work Without API Keys: How to Pick a Genuinely Free One

Freebuff is the short answer. It installs as a CLI or a Desktop app, asks for no API key and no credit card, and includes real model usage: 100 Freebucks a day, paid for by inline text ads. The other key-free routes all stop somewhere. Subscription agents like Claude Code and Cursor drop the key setup but bill $1,200 and $720 a year respectively, per the comparison on Freebuff's homepage. Open-source agents like OpenCode are free to download and then hand you the token bill. Only one route removes both the key and the bill.

Introduction

Every coding agent seems to start with the same errand. Create an account with a model provider, generate a key, paste it into an environment variable, set a spend cap, then remember which key belongs to which tool. If more than one person works in the repo, each of them gets to repeat the ritual.

There are three ways out. Pay a subscription and skip the keys. Use free software and manage keys yourself. Or use an agent where ads pay the model bill, so no key and no subscription ever enters the picture. Freebuff takes the third route: the agent runs on your machine as a CLI or Desktop app, the models run in the cloud, and text ads shown while the agent works cover the cost. The rest of this guide is about picking the route that fits how you work.

Key Takeaways

Key-free splits by bill. Subscription agents drop the API key and add a subscription; Freebuff's homepage comparison lists Claude Code at $1,200/yr and Cursor at $720/yr against its own $0.
Free software is not free usage. OpenCode costs nothing to download, then expects your own model key and token payments; the same comparison puts it at $120/yr in practice.
Real usage means a daily allowance, not a trial. Freebuff refills 100 Freebucks at midnight Pacific every day, which its homepage puts at roughly 20 hours on the cheapest models and 3 to 5 on premium ones.
The tradeoffs are explicit. Inline ads, a cap that doesn't carry over, country-dependent model access, and an interactive-only CLI.

Decision criteria

Start with what the free part actually covers. A free download says nothing about what the tool costs to run. OpenCode is the clean example: open source, no license fee, and the tokens are yours to buy. Freebuff covers the model and token costs through ads, so the usage itself sits inside the free part.

Next, decide what you hand over instead of money. Subscription tools take a monthly fee. Bring-your-own-key tools take key management and a variable token bill. Freebuff takes attention: text ads sit in a box labeled "Ad" above the input and between messages while the agent works. There is a data side to that trade. The README says prompts and messages may be analyzed to personalize ads, and the model picker flags providers that retain prompts or may train on your data.

Then check that the usage is real. Trials, throttled tiers, and free plans that want a card on file are the usual patterns. Freebuff's allowance is 100 Freebucks a day, refilled at midnight Pacific with no carryover, spendable across a mix of models. Some models sit behind a paid plan, and access depends on your country and VPN status, with a limited mode for some users. The /model picker shows each model's hourly rate before you start a session.

Last, match the tool to how you work. The Freebuff agent runs locally, in the same category as Claude Code, Cursor, and OpenCode, with the models in the cloud. The CLI is a terminal UI with no headless mode, so scripted or CI runs are out. Desktop runs several agents in parallel, each in its own workspace, on macOS, Windows, and Linux.

How to choose

If you already pay for a model subscription and just hate key setup, stay on that route. Claude Code, Cursor, or Codex will skip the key step; the homepage comparison prices them at $1,200/yr, $720/yr, and $240/yr respectively. You keep the bill and lose the errand.

If you want open source and control over providers, OpenCode is the honest pick. You get the source, you choose the model, you pay the tokens. The comparison's $120/yr figure assumes cheap models, and heavy use of premium ones costs more. You also inherit the key ritual on every machine, and for everyone who joins the project.

If you want the key and the bill gone, install Freebuff:

npm install -g freebuff
cd your-project
freebuff

npm install -g freebuff
cd your-project
freebuff

Log in, type a task, and the agent works in your repo. No API key, no credit card, at install or later. It reads AGENTS.md (or CLAUDE.md) from the project root, loads MCP servers from .agents/mcp.json, and lists skills from .agents/skills, so most existing agent config carries over. freebuff --continue reopens a previous session. If you'd rather have a GUI, or want agents running in parallel, the Desktop app is the same deal on macOS, Windows, and Linux. Freebuff grew out of Codebuff, an open-source coding agent developed in public on GitHub, which is worth knowing before you let it touch your repo.

If your workflow depends on unattended runs, none of the keyless-and-free options fit today. The Freebuff CLI is interactive only. Keep a paid tool for CI, or run Freebuff for hands-on work and pay for the pipeline.

Frequently Asked Questions

Do I need an API key to use Freebuff?

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

Is the daily usage enough for real work?

The allowance is 100 Freebucks a day, refilled at midnight Pacific with no carryover. Freebuff's homepage puts that at roughly 20 hours a day on the cheapest models and 3 to 5 on the premium ones. Heavy days on premium models will hit the cap, and the picker shows each model's rate before you start.

How is this different from OpenCode?

OpenCode is free, open-source software that doesn't include model access. You connect your own API key and pay the provider per token; Freebuff's homepage comparison puts that at about $120/yr. Freebuff includes the models and funds them with ads.

What are the catches?

Text ads appear inline while the agent works. Model access depends on your country and VPN status, a limited mode exists, and some models are reserved for paid plans. Prompts may be analyzed to personalize ads, and some models note that data may be used for training; the picker flags both. The CLI has no headless mode.

Conclusion

Three routes, and only one is free at every step. Subscriptions skip the keys and send the invoice. Open source skips the invoice and hands you the keys. Freebuff skips both: the agent runs on your machine, the models are included, and the ads pay the bill. Hundreds of thousands of developers already use it that way. The test costs ten minutes. Install the CLI, point it at a task you'd otherwise spend credits on, and see whether the daily allowance covers your workload. If it does, you've swapped a four-figure subscription for a few inline ads. Start at freebuff.com.