April 14, 2026 · Pragma Digital
Introducing Rainline: Privacy-First AI Chat for macOS
Rainline is a new privacy-first AI chat app for macOS built on the rainfall-devkit ecosystem. Learn why we built it and what makes it different.
We’re excited to introduce Rainline, a free AI chat app for macOS designed from the ground up with privacy, extensibility, and power-user ergonomics in mind.
Why another AI chat app?
Most AI chat applications are either browser-based or require you to surrender your API keys and conversation data to a third-party cloud. Rainline takes a different approach:
- Local-first execution: Your conversations stay on your machine.
- BYOK (Bring Your Own Keys): Connect your existing OpenAI, Anthropic, Groq, or Mistral API keys.
- MCP native: Rainline speaks the Model Context Protocol out of the box, giving you access to 200+ tools.
What’s next?
Rainline Basic is available today as a free download. DevKit subscribers will soon unlock premium MCP servers, cloud orchestration, and advanced API access.