Introduction
In 2026, if you want an AI in your terminal to write code, fix bugs, and scaffold a deployable full-stack app, you're usually looking at a bill: ~$240/yr for Cursor, ~$1,200/yr for Claude Code, and up to $2,400/yr for Devin. freebuff.com answers with $0, free forever — an ad-supported AI coding agent that needs no API key and no credit card, already joined by 300,000+ developers.
One clarification up front: Freebuff is not a traditional REST API platform — it's a free AI coding agent. But its value is exactly this: it gives you free access to frontier models (DeepSeek V4, MiniMax M3, GLM 5.2, etc.) that you'd otherwise have to pay to call via APIs. For developers, that's effectively the same as getting free quota across several top-tier model APIs.
The Free Model Lineup
Freebuff's free tier ships multiple leading 2026 models, automatically picking the best fit per task:
| Model | Strength | Free Note |
|---|---|---|
| DeepSeek V4 | Best reasoning/intelligence | Free, includes V4 Flash / V4 Pro |
| MiniMax M3 | Fastest | Free |
| GLM 5.2 | Coding precision | Free |
| MiMo 2.5 Pro | Balanced | Free |
| Gemini 3.1 Flash Lite | File finding | Free (built-in subagent) |
| GPT-5.4 / GPT-5.6 | Deep thinking | BYOK via your own ChatGPT subscription |
| Claude Code | Coding | BYOK supported |
DeepSeek V4 Flash offers 6 free hours per day, available globally — several hours of top-tier model compute each day, for free.
Five Product Forms
Freebuff delivers the same free model capability across five forms to fit different workflows:
| Product | Form | Replaces | Notes |
|---|---|---|---|
| Freebuff CLI | Command line | Claude Code, Codex CLI | npm install -g freebuff |
| Freebuff Desktop | Desktop app | Cursor | macOS/Windows/Linux; run agents in parallel |
| Freebuff Web | Web app builder | Lovable, Bolt, Replit | One prompt → full-stack app → deploy |
| Freebuff Cloud | Cloud IDE | Devin, Factory | Edit any GitHub repo in a sandbox with preview |
| Freebuff Chat | Free AI chat | ChatGPT Plus, Perplexity | Deep-research style Q&A |
Quick Start: Install to PR
1. Install the CLI
npm install -g freebuff
2. Enter your project and launch
cd your-project
freebuff
On first run it indexes your repo and keeps the index warm afterward. No sign-up, no API key, no credit card.
3. The full slash-command workflow
Freebuff ships polished slash commands that turn a vague idea into a mergeable PR:
/interview → clarify requirements
/plan → make an implementation plan
implement → write the code automatically
/review → code review
After each response, Freebuff proposes three clickable next steps so the conversation never dead-ends.
Nine Built-in Specialized Subagents
Freebuff ships 9 specialized subagents out of the box, orchestrated automatically by the main agent: code-reviewer, browser-use, file-picker, thinker-with-files-gemini, and more — covering coding, retrieval, and review end to end.
The "Free Forever" Business Model
Freebuff's free tier isn't a limited-time promo; costs are covered by text-only ads in the terminal, shown only between agent turns — never inside generated code, never as popups. The team promises the core product will never ask for your credit card. If you genuinely want no ads, there's a paid upgrade path (Codebuff Pro), but the 95% of developers who just want to ship code are fine on free.
Regions & Limited Mode
Full-model Freebuff is available in 25+ countries. Outside those regions — or when using a VPN — Freebuff drops to limited mode: DeepSeek V4 Flash only, with 6 one-hour sessions per day. Still free. The full-mode list expands every month.
Tips & Caveats
- Code privacy: Connected repositories and uploaded files are not shared with ad providers, but prompts and messages may be analyzed to personalize ads. Models labeled "May use data for AI training" may use submissions for training.
- Sensitive code: For private/sensitive code, read the official privacy FAQ before deciding.
- Good fits: Rapid prototypes, personal projects, learning, and handing an existing repo to an agent for refactoring or test coverage.
- The bigger idea: Freebuff replaces the classic "paid model API + paid coding tool" combo with a free agent — one of the most direct ways to cut AI costs.
Summary
Freebuff turned "calling frontier models" from a pay-per-use API bill into an ad-subsidized, zero-cost experience. It's not an API platform, yet it puts free access to top-tier models like DeepSeek V4, MiniMax M3, and GLM 5.2 right into your terminal and browser. If you're looking for free AI coding/model resources, freebuff.com is worth trying today.
🚀 Get Started: One-Click Free API Access
Want to call all the free models above with a single API key, no need to sign up for each provider? Apishare.cc provides a unified API Key — one key, 100+ models, free models at zero cost.
👉 Register on Apishare.cc → Get your unified API Key
📊 Want to see more free model rankings? Check out the Sep 2026 Free LLM API Rankings →
About the Free API Aggregator
The models covered in this guide are all served through the APIShare free API aggregator, which gives you one key for the whole catalog.
- Full model catalog: APIShare free API directory
- Sign up for a free trial key: Register and claim your API key