Crab Code

AI coding assistant
in your terminal

Install in one command. Pay with Alipay. Start coding smarter with Crab Pro — an AI that reads, writes, and refactors code alongside you.

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Terminal
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Pay with Alipay

Top up tokens directly from your terminal. Run crab-code pay <amount>, scan the QR code with Alipay, and your tokens are credited instantly.

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Install in seconds

One command on any platform. macOS, Linux, and Windows.

curl -fsSL https://crabcode.ai/install.sh | sh

Downloads the latest binary for your platform (macOS / Linux, x64 / arm64).

1

Login

crab-code login

Email + verification code

2

Top Up

crab-code pay 10

Scan Alipay QR in terminal

3

Code

crab-code "fix this bug"

AI reads & writes code for you

Built with Rust. Blazing fast.

Unlike TypeScript-based CLI tools, Crab Code is a native Rust binary. Zero runtime overhead, instant startup, minimal memory.

Startup Time
TS
~800ms
Rust
~5ms
160x faster
Memory Usage
TS
~120MB
Rust
~18MB
6.7x lighter
Install Size
TS
~250MB
Rust
~20MB
12x smaller

Single static binary. No Node.js, no node_modules, no runtime dependencies.

Self-developed AI agent

Crab Code is not a wrapper or proxy. It's a ground-up Rust implementation of an autonomous coding agent with its own tool system, session management, and plugin architecture.

  • •
    9 Rust crates — modular architecture: CLI, runtime, API, tools, commands, plugins, telemetry
  • •
    57K+ lines of Rust — production-grade, memory-safe, zero undefined behavior
  • •
    Built-in tool execution — file read/write, bash, glob, grep, git, all native
  • •
    Session persistence — auto-saved sessions, resume anytime with --resume latest
crab-code/rust/crates/ ├── rusty-claude-cli/ CLI binary + REPL ├── runtime/ Session, prompt, hooks ├── api/ Provider clients ├── tools/ File ops, bash, search ├── commands/ Slash command registry ├── plugins/ Plugin lifecycle ├── telemetry/ Usage tracking ├── compat-harness/ Parity testing └── mock-anthropic-service/

Extensible with Skills & MCP

Add custom skills and connect external tools via the Model Context Protocol.

Skills

Drop a markdown file into .crab-code/skills/ and it becomes a slash command.

# .crab-code/skills/review/SKILL.md --- name: review description: Code review with best practices --- Review the current diff for: - Security vulnerabilities - Performance issues - Code style violations $ crab-code > /review # runs your custom skill

MCP Servers

Connect databases, APIs, and external tools. The agent calls them as needed.

# .crab-code/settings.json { "mcpServers": { "postgres": { "command": "npx", "args": ["@modelcontextprotocol/server-postgres", "postgresql://localhost/mydb"] } } } > show me the top 10 users by revenue MCP postgres: running query...

Simple, transparent pricing

No subscriptions. No hidden fees. Pay only for what you use.

Free

Try it out

10K
tokens on signup
  • ✓ Full CLI access
  • ✓ Email registration only
  • ✓ No credit card needed
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Popular

Pay as you go

Top up anytime

$5 / M tokens
≈ ¥36 / million tokens
  • ✓ Powered by Crab Pro
  • ✓ Pay via Alipay
  • ✓ ~200+ coding sessions per ¥100
Get Started