Freebuff Free Coding Agent: 100% Free AI Coding Agent

Freebuff is a completely free AI coding Agent, claiming to make coding 100% free.

No API Key, no subscription, no credit card. It uses the best open-source models so you can code for free.

What is Freebuff

Freebuff is an open-source CLI coding Agent, similar to Claude Code and Codex CLI, but completely free.

Key selling points:

Completely free — No API Key, no subscription needed
Uses open-source models — Best open-source models built-in
Fastest speed — Ranked #1 on speed, autonomy, and out-of-the-box subagents
Subagents — Supports parallel sub-agent work

Features

Autonomous multi-step execution:

Read, edit, run, verify code
Automatically complete multi-step programming tasks

Parallel Subagents:

Supports multiple sub-agents working in parallel
Each sub-agent handles different programming tasks

Built-in tools:

File read/write, search/replace, bash commands
Code graph analysis
Auto-fix

Good compatibility:

Supports mainstream open-source models
Can connect to various LLMs

Comparison with Other Free Coding Agents

Tool	Free	Subagents	Speed	Best For
Freebuff	100% free	✅	⭐⭐⭐⭐⭐	Speed and autonomy
Aider	Software free	❌	⭐⭐⭐	Git workflow
OpenCode	Open-source free	❌	⭐⭐⭐⭐	Terminal users

Freebuff ranks #1 in speed, autonomy, and out-of-the-box subagents. Aider and OpenCode are excellent open-source picks but require BYOK (bring your own key).

Installation

# Install Freebuff
curl -fsSL https://freebuff.com/install.sh | sh

# Start using
freebuff "build a todo app"

See official docs for specific installation instructions.

Who Should Use This

Budget-conscious developers — Completely free, no hidden costs
Need fast coding — Freebuff ranks #1 on speed
Like Subagents — Parallel sub-agent workflows
Open-source fans — Fully open-source

Summary

In one sentence: Freebuff is a completely free AI coding Agent, no API Key needed, uses open-source models, fastest speed, supports Subagents parallel.

If you want a completely free, fast coding Agent, Freebuff is the current top choice.

Project: freebuff.com

Data current as of July 14, 2026. Freebuff is an open-source project, actively maintained.