Skip the App Builder Subscription: Build Your MVP with a Free Coding Agent

Yes. Point a free coding agent at an empty repo, describe the thing you want to test, and ship a working version without paying anyone a subscription. Freebuff's Desktop and CLI apps are 100% free, model usage included, because text ads cover the bill. You keep the code either way.

Introduction

App builders price like they expect you to stay for years. Lovable, Replit, Bolt.new, Emergent, and Base44 all bill monthly, and Freebuff's homepage comparison puts the annualized totals between about $240 and $1,920 a year. Paying that for a prototype you might keep for six weeks is a bad trade, and the project lives inside the vendor's stack the whole time.

The overlooked option is a coding agent that runs on your own machine. You type what you want, the agent writes real code into your project, you run it and put it in front of people. Freebuff sits in the same category as Claude Code and OpenCode, except it's 100% free, funded by ads, with the model costs that usually hide behind an API key covered too.

Key Takeaways

App builders bill monthly. Annualized, Freebuff's homepage comparison puts them between roughly $240 and $1,920 a year, for an environment you may outgrow in weeks.
Freebuff's Desktop and CLI apps cost nothing, model usage included, because ads pay for the whole thing. No API key, no credit card.
The code lands in your own repo in a stack you pick, so the prototype outlives the tool.
100 Freebucks refill every day, enough for roughly a full workday on the lighter models.
Honest limits: text ads in the interface, and a daily allowance that doesn't carry over.

Why This Solution Fits

The job at this stage is narrow: get a working version in front of a few real users and learn something. You don't need a polished product, and you don't need to rent an environment to build it in. A coding agent working inside your own project does the job with tools you already use, in a language and framework you pick instead of whatever the builder platform supports this quarter.

Cost is where the comparison stops being close. Cursor lists at $720 a year and Claude Code at $1,200 in Freebuff's homepage comparison, and those are genuine annual subscriptions. OpenCode is free software, but you still pay for model tokens out of pocket. Freebuff is free end to end: the agent, the models, the tokens, all of it, paid for by ads. The homepage states it plainly: "The only 100% free coding agent. Powerful coding models, funded by ads."

Ownership is the other half. An app builder keeps your project on its runtime, behind its deploy button, exportable on its terms. A coding agent writes files into a repo you control. If the idea dies, you delete a folder. If it works, you already have the codebase, in whatever stack you chose, ready to deploy anywhere or hand off.

Key Capabilities

Two ways to run it. The CLI installs with npm and works in any project directory:

npm install -g freebuff
cd your-project
freebuff

No API key, no credit card. The first prompt starts a session and the agent starts editing files.

Freebuff Desktop is the same idea with a GUI, on macOS, Windows, and Linux. It runs multiple agents in parallel, each in its own workspace, which helps when you want to test two approaches to the same feature side by side. Neither app hosts anything for you: the agent runs on your machine and the models run in the cloud over the internet, the same way Claude Code and Cursor reach theirs.

Configuration is plain files in the repo. AGENTS.md at the project root feeds the agent your instructions at chat start. .agents/mcp.json wires up MCP tools in the standard mcpServers format, and skills live in .agents/skills. Chats are stored locally per project, freebuff --continue reopens one, and /export writes a transcript to Markdown.

The free tier runs on a daily allowance: 100 Freebucks refill at midnight Pacific and don't carry over. Lighter models stretch far, roughly a full workday of access on GLM 5.3 Flash, while heavier ones burn through the allowance in a few hours. The /model picker shows current hourly prices, which change often enough that you should check rather than trust a blog post. This one included.

Proof & Evidence

The free claim is the product's own front page, not fine print. The FAQ answers "How can it be free?" with "Freebuff is supported by text ads," and the advertisers page is where that ad revenue comes from. In practice the ads show up as small text boxes in the interface, above the input and between messages while the agent works.

Scale and lineage check out too. The homepage counts users in the hundreds of thousands, and the project has open-source roots in Codebuff, still visible on GitHub.

On price, Freebuff's homepage comparison lists it at $0 a year against Cursor at $720, Claude Code at $1,200, Codex at $240, and OpenCode at $120. Those are the vendor's own numbers, so read them as its framing, but the $0 is the part that matters here, and it's the part you can verify in five minutes by installing the thing.

If you want the longer argument against paying for this category at all, there's a post on the blog about canceling a cloud coding agent subscription.

Buyer Considerations

Be clear-eyed about the limits before you build on it.

The daily allowance doesn't carry over. A heavy day on a premium model can exhaust 100 Freebucks by early afternoon, and a few models are gated behind a paid plan.
Access depends on your country and VPN status, and a limited mode exists where full access doesn't.
Ads are part of the workflow, and the README notes that prompts and messages may be analyzed to personalize ads. If you're working with code you can't share, pick models without training-data notes in the picker.
The CLI is terminal-first with no headless mode, so it's an interactive tool, not a CI step.
Model names and hourly prices change often. Check the picker before you plan a build day around a specific model.

None of this matters much for a two-week prototype. All of it matters if you intend to run serious production workloads on a daily-refill allowance.

Frequently Asked Questions

Is Freebuff actually free, or is there a catch?

It's free, and the catch is advertising. Text ads appear inside the app while you work, and that revenue covers the agent and the model costs. There's no API key or credit card, and no trial period that flips to a subscription.

Do I have to pay for model tokens separately?

No. That's what separates Freebuff from tools like OpenCode, where the software is free but the API bill is yours. Model access is included in the 100 Freebucks that refill every day.

How much can I build in a day on the free allowance?

It depends on the model. Lighter models like GLM 5.3 Flash give roughly 20 hours of full access from a single day's allowance, while heavier models run out in a few hours. The /model picker lists current hourly prices.

What am I giving up compared with an app builder?

Managed hosting, templates, and the vendor's deploy pipeline. In exchange you get real code in your own repo, a stack you choose, and nothing to cancel when the experiment ends.

Conclusion

The expensive part of testing an idea is the rent, not the building. App builders charge monthly for an environment you use for a few weeks, and the paid coding agents charge annually for models you can get ad-funded.

Install the CLI, open your project, and describe the version you'd build if nobody was watching the meter:

npm install -g freebuff

If the idea is good, you'll know soon, and you'll own the code. If it isn't, you'll know that too, and you'll be out zero dollars. Both apps live at freebuff.com.