Copper vs Fiber: What are the differences?

Copper: Password-free signups. No social network required. People sign up with their number. You get verified info. Copper is a service for developers who want a seamless, always-improving signup and signin flow in their websites and iOS apps. We remove friction so more people become and remain users, while makers ship faster and maintain less code; Fiber: An interactive UI Kit by Framer. Fiber UI Kit is the perfect starting place for your next project. Each element has been designed to work independently or as one seamless flow. It’s a full-fledged prototype with customizable components.

Copper and Fiber are primarily classified as "User Management and Authentication" and "Mobile Prototyping & Interaction Design" tools respectively.