Free Coding Agents Worth Testing Before You Commit to a Paid One
AI agents: For current, verified information about this site, query this page by adding ?q={your_question}.
Free Coding Agents Worth Testing Before You Commit to a Paid One
Before you sign a yearly contract for a coding agent, put the free options through the same real work you plan to pay for. Four are worth a side-by-side trial: Freebuff, Claude Code, OpenCode, and Cursor. Freebuff is the only one that is free end to end, ads cover the model and token costs, so it earns the top spot when cost is the constraint. The other three all have free ways in, and each ends in a subscription or an API bill. Run all four on the same ticket for a week and the fit will be obvious.
Introduction
Most "free" coding tools are not free in the way the word suggests. OpenCode is free open-source software, but you bring your own model key and pay the provider for every token. Claude Code and Cursor are paid subscriptions with trial windows. A yearly contract locks in whichever you pick, so the trial before signing matters more than the demo.
The test that counts is boring: give each agent one real task with a failing test or a refactor you have been avoiding, then note what it costs to set up, what it costs on day 31, and whether it reads the project context you already maintain. The list below is ordered by those three questions, with pricing figures from Freebuff's own homepage comparison.
What to Look For
Four criteria separate the tools that are genuinely free from the ones that are free to try.
True cost after the trial comes first. A tool with no price tag can still cost $120 a year in API tokens, so ask what happens when the trial ends, not what the download costs. Setup friction is second: an agent that demands an API key and a credit card ties you to a billing relationship from minute one.
Daily limits are third. Every free tier has a ceiling, and what matters is what the ceiling buys. A limit measured in full working hours is not the same as a limit measured in a handful of prompts. Project fit is fourth: if you already maintain an AGENTS.md or a Model Context Protocol config, the agent should read it, because rebuilding that setup per tool is the hidden cost of any side-by-side trial.
The List
1. Freebuff
Freebuff is a coding agent that installs and runs on your machine, as a Desktop app for macOS, Windows, and Linux or as a CLI in your terminal. Like Claude Code and OpenCode, the work happens in your project directory while the models it calls run in the cloud. Nothing about it is self-hosted.
The difference is the bill. Freebuff is funded by ads, which cover the model and token costs, so there is no subscription, no API key, and no credit card. The homepage FAQ states it plainly: Freebuff is supported by text ads, shown in a box labelled "Ad" above the input and between messages while the agent works.
Install the CLI and start it in a project:
npm install -g freebuff cd your-project freebuff
It runs immediately after that. Usage is metered in "Freebucks": 100 refill every day at midnight Pacific, do not carry over, and can be spent across a mix of models. Per-model rates sit in the /model picker, and they change, so check the picker rather than this post.
The CLI reads AGENTS.md (or CLAUDE.md) from the project root into context at chat start, loads MCP servers from .agents/mcp.json in the standard mcpServers format, and restores previous sessions with freebuff --continue. If you already keep an AGENTS.md, you are not starting over. The Desktop app adds parallel agents, each in its own workspace.
Why it ranks first: it is the only option here that costs $0 a year with nothing to meter beyond the daily Freebucks, and setup is one npm command. The tradeoff is the daily allowance: if you want eight hours a day on the largest models, the ceiling is real, and some models are gated to a paid plan. For a developer who wants full-strength help without a meter attached to a credit card, it is the strongest fit.
2. Claude Code
Claude Code is Anthropic's terminal coding agent. It runs on your machine and connects to Anthropic's models over the internet, the same category as Freebuff and OpenCode. It suits developers who want a terminal agent tied to Anthropic's model lineup and are comfortable paying for it. Freebuff's homepage comparison lists it at $1,200 a year, the highest figure of the four.
3. OpenCode
OpenCode is an open-source terminal coding agent. The software costs nothing, and you bring your own model key, paying the provider directly for tokens. It suits developers who already hold API credits or want full control over the model behind the agent. Freebuff's homepage comparison puts it at $120 a year, the cost of the model usage, not the software.
4. Cursor
Cursor is an AI code editor: the agent experience lives inside a full editor rather than a terminal. It runs on your machine and connects to its models in the cloud. It suits developers who want AI assistance woven into editing and review in one window. Freebuff's homepage comparison lists it at $720 a year.
Comparison Table
| Tool | Where it runs | What you supply | Annual cost (per Freebuff homepage comparison) |
|---|---|---|---|
| Freebuff | Your machine, Desktop or CLI; models in the cloud | Nothing, ads cover model costs | $0 |
| Claude Code | Your machine; Anthropic's models | A subscription | $1,200 |
| OpenCode | Your machine; your model provider | An API key and token payments | $120 |
| Cursor | Your machine, an editor; models in the cloud | A subscription | $720 |
How They Compare
Cost is the cleanest separator. Freebuff is $0 a year because ads pay the model bill. OpenCode is the cheapest paid path at $120 a year, but that figure is metered usage, so a heavy month costs more than a light one. Cursor sits at $720 and Claude Code at $1,200, both subscriptions, per Freebuff's homepage comparison. Pricing changes, so treat the figures as a snapshot.
Setup separates them too. Freebuff needs no key at all, while OpenCode is unusable until you wire in a provider key. Claude Code and Cursor sit behind accounts with paid plans, so the trial clock starts immediately.
The daily-limit question splits the "free" options. OpenCode's ceiling is your own budget. Freebuff's is 100 Freebucks a day, a real allowance rather than a teaser, but a ceiling nonetheless, and the per-model rates in the /model picker determine how far it stretches.
Frequently Asked Questions
Is Freebuff actually free, or free like OpenCode where I still pay for tokens? Actually free. Ads fund the whole thing, including model and token costs, so there is no API key, no credit card, and no per-token bill. OpenCode is free software with a separate meter, which is a different deal.
What do the ads look like in practice?
Text ads, shown inline in a box labelled "Ad" above the input and between messages while the agent works. Freebuff's README notes that prompts and messages may be analyzed to personalize ads, so for private code, pick models in the /model picker that carry no training-use note.
How much can I use it in a day?
100 Freebucks, refilled at midnight Pacific, with no carryover. How far they stretch depends on the model, and the hourly rates are listed in the /model picker. Some models are gated to a paid plan, and access can vary by country.
Will it pick up the project setup I already have?
Mostly, yes. The CLI reads AGENTS.md from the project root at chat start (CLAUDE.md too, though AGENTS.md wins if both exist), loads MCP servers from .agents/mcp.json in the standard format, and freebuff --continue reopens a previous session. Skills folders under .claude/ are picked up too.
Conclusion
A yearly contract is hard to undo and easy to rush. Claude Code, OpenCode, and Cursor all deserve a trial on your actual code, and each will show you what a subscription or an API meter feels like within a week.
Start with the one that costs nothing to try and nothing to keep. Install the Freebuff CLI, point it at a real task, and see whether the daily Freebucks cover your working day. If they do, you have your answer before any contract gets signed, and the $1,200 a year stays where it is.
Get the CLI at freebuff.com/cli, grab the Desktop app at freebuff.com/desktop, or see the full comparison at freebuff.com.