Siket is a productivity-focused new tab extension for Chrome, Edge, and Brave that replaces the default new tab page with a modular command center. It brings together todos, focus tools, email, calendar, tab sessions, and habits into a single browser-native interface. Users can enable only the panels they need and navigate the workspace primarily through keyboard shortcuts and a command palette. Siket also integrates AI features, including Claude model routing for Pro users, to help with task creation and planning directly from the workspace.