FreeBuff: Free AI Coding Agent With No Subscription
FreeBuff is a free, ad-supported AI coding agent that runs in your terminal and browser. Learn how to install it, what models it supports, and how well it handles real coding tasks.
FreeBuff is a free coding agent that runs in your terminal and browser. No subscription, no API keys to manage, no credit card. You install it, log in, and start coding with AI models like Xiaomi’s MiMo V2.5, DeepSeek V4, and MiniMax M3.
I tested it by asking it to build an Astro website from scratch. Here’s what happened.
What you'll learn
- How FreeBuff works and what models it uses
- Installation and setup in under a minute
- FreeBuff Web for building full-stack apps from a prompt
- Real test results building an Astro website with FreeBuff CLI
- Where it fits compared to paid tools like Claude Code and Cursor
What is FreeBuff?
FreeBuff is the free, ad-supported version of Codebuff, an open-source AI coding assistant. While Codebuff requires a subscription, FreeBuff gives you access to AI coding through text ads shown during your session.
The tool works in two ways: a CLI agent that runs in your terminal, and FreeBuff Web for building full-stack apps directly in your browser.
Unlike tools locked to a single provider, FreeBuff lets you pick from several models depending on what’s available in your region. The multi-agent architecture coordinates specialized agents (file picker, planner, editor, reviewer) to handle tasks, rather than relying on one model to do everything.
Try FreeBuffAvailable models
FreeBuff rotates between open-source and optimized models. What you see depends on your location:
| Model | Provider | Notes |
|---|---|---|
| MiMo V2.5 | Xiaomi | 1T parameters, handles images, sound, and video |
| DeepSeek V4 Pro/Flash | DeepSeek | Strong coding performance |
| MiniMax M3 | MiniMax | Open-weight model released June 2026 |
| Kimi K2.6 | Moonshot | Available in some regions |
MiMo V2.5 stood out during testing. It’s a smaller model compared to the others, but it handled the Astro project without getting stuck. It also has vision capabilities, which means you could potentially feed it screenshots of designs you want to recreate.
Installing FreeBuff CLI
One command gets you started:
npm install -g freebuffThen navigate to your project and run it:
cd your-project
freebuffOn first run, it’ll ask you to log in. After that, you pick a model and start chatting.
You get 5 free sessions per day. Each session lets you work on a task until completion. If you refer friends, you get additional usage.
FreeBuff Web: browser-based app builder
FreeBuff Web is a separate product that lets you type a prompt and get a working full-stack app. Think of it as a free alternative to Lovable, Bolt.new, or v0.
You go to freebuff.com, pick a template or describe what you want, and it generates a deployed app. The web interface supports the same models as the CLI.
There’s also a “Cloud” feature in beta for coding directly in the cloud, though it’s not available in all countries yet.
Real test: building an Astro website
I put FreeBuff to work on a real task: creating a solar panel company website with Astro. The prompt included specific requirements for pages, Tailwind styling, and a professional layout.
Here’s what happened:
The good parts:
- It generated all the pages (index, about, services, contact) without major hiccups
- Components were clean and well-structured with proper descriptions, titles, and meta tags
- The build completed successfully after FreeBuff automatically fixed some build errors
- Total time was around 10 minutes for a complete multi-page website
- The generated code was organized with proper Astro conventions
The rough edges:
- It didn’t import Tailwind CSS in the layout file, which broke the styling. I had to add one line manually.
- It removed the SEO component and baked meta tags directly into the layout. Not ideal for a real project.
- Google Fonts weren’t loaded using Astro’s recommended approach
- Some accessibility issues with buttons appeared during the code review
- The AI reviewer subagent caught some problems and fixed them (like a missing favicon), but not all
After a quick manual fix for the Tailwind import, the site actually looked decent. Nice header with animations, working navigation, testimonials section, and a proper footer. For a free tool producing this in 10 minutes, that’s not bad.
Try FreeBuffHow it compares to paid tools
FreeBuff won’t replace Claude Code or Cursor for complex backend work. The models are capable for front-end tasks and straightforward coding, but they hit limits with more demanding projects.
Where FreeBuff makes sense:
| Use case | FreeBuff | Paid tools |
|---|---|---|
| Landing pages and static sites | Works well | Overkill |
| Learning to code with AI | Good starting point | Too expensive for experiments |
| Quick prototypes | Gets the job done | Faster but costs money |
| Complex backend systems | Will struggle | Better suited |
| Production applications | Not recommended | More reliable |
The previous attempt at this model (AMP Code) lasted a few months before the ad-supported approach wasn’t sustainable. FreeBuff has been running for several months now, so it seems to be holding up better.
Who should use FreeBuff?
Beginners who want to understand how AI coding agents work without spending money. You get a feel for the CLI workflow, learn how to prompt effectively, and see what these tools can do.
Developers on a budget who need help with small tasks. If you’re building a personal project or need a quick prototype, FreeBuff handles that fine.
Anyone curious about AI coding who doesn’t want to commit to a $20-50/month subscription just to try things out.
If you’re already paying for Claude Code or Cursor and rely on them for production work, FreeBuff isn’t going to replace that. But as a free tool to have in your toolkit, it’s worth trying.
Tips for better results
Based on my testing, here’s what helps:
- Be specific in your prompts — tell it exactly what pages you want, what framework, and what styling approach
- Provide documentation — if you’re using a specific framework like Astro, mention the docs so the agent uses the right patterns
- Check the build — FreeBuff runs builds automatically, but verify the output yourself
- Fix small issues manually — sometimes one missing import is faster to fix yourself than waiting for the agent
Referral program
FreeBuff offers extra usage if you refer other users. Share your referral link and get additional sessions beyond the daily 5 free ones. This helps if you’re using it regularly for projects.
FAQ
Is FreeBuff really free?
Yes. It’s supported by text ads shown during your coding sessions. No credit card, no subscription, no API keys needed. You install it with npm and start using it.
What's the difference between FreeBuff and Codebuff?
Codebuff is the paid product with more models, no ads, and additional features. FreeBuff is the free, ad-supported version that uses optimized open-source models. Both share the same codebase and multi-agent architecture.
Can I use FreeBuff for commercial projects?
You can, but the models used in Free mode are optimized for speed over depth. For production work, you’d want to test thoroughly and consider whether the output meets your standards.
How many sessions do I get?
5 free sessions per day. Referring other users gives you additional sessions. The web interface has its own limits.
Does FreeBuff work offline?
No. It needs an internet connection to access the AI models. Your files are edited locally, but the AI processing happens on FreeBuff’s servers.
Wrapping up
FreeBuff fills a gap in the AI coding tools space. Not everyone can or wants to pay $20-50/month for AI assistance, and FreeBuff gives you a working alternative. It has limitations — the models aren’t as powerful as Claude or GPT-5, and you’ll hit walls with complex projects. But for learning, prototyping, and small tasks, it does the job.
If you’re interested in other free AI coding tools, check out Amp Code Free or our guide on AI coding tools for beginners.
Try FreeBuff
