FEATURES

Built for power users

Every feature in Rainline is designed for daily, intensive use—privacy-first, extensible, and blazing fast.

Your keys. Your data. Your machine.

Rainline stores API credentials in the macOS Keychain, not in the cloud. A lightweight local daemon handles tool execution, meaning your conversations and keys never leave your device unless you explicitly choose to connect to a remote provider.

Privacy Architecture

Keychain-secured API credential storage
Local-only tool execution daemon
No telemetry or conversation logging
Optional network isolation mode

One protocol. Infinite tools.

Rainline speaks the Model Context Protocol (MCP). Connect to any MCP server—local or remote—and mix Rainfall tools, community servers, and your own custom integrations in a single unified palette.

MCP Integration

Native MCP client built-in
Mix Rainfall, MCP, local, and external tools
Real-time inline tool execution status
Automatic tool discovery and registration

Bring Your Own Keys.

You are not locked into a single AI provider. Rainline supports OpenAI, Anthropic, Groq, Mistral, and any custom OpenAI-compatible endpoint. Switch models instantly without reconfiguring your workflow.

Multi-Provider System

OpenAI, Anthropic, Groq, Mistral
Custom OpenAI-compatible endpoints
Per-conversation model selection
No proxy or middleman required

Zero-friction access.

Rainline lives in your menu bar and responds to a global hotkey. Whether you are deep in code or browsing the web, you can summon Rainline instantly, copy responses, and get back to work.

Power User Features

Global hotkey: Cmd+Shift+R
Menu bar integration
Keyboard-first navigation
Quick copy and resume workflow

Beautiful rendering for technical content.

Rainline renders KaTeX math expressions, wrapped tables, and syntax-highlighted code blocks with automatic language detection. Perfect for researchers, developers, and anyone working with complex documents.