CHECKLIST2
Updates

Feature: Light/Dark Mode Toggle

March 10, 2026

Feature

Checklist2 now supports light and dark mode with a toggle in the top-right corner. Your preference is saved across sessions.

Light/Dark Mode

Checklist2 now supports both light and dark mode. The toggle is in the top-right corner of every page.

Implementation Details

  • Dark mode is the default
  • Preference is saved to localStorage
  • A blocking script prevents flash-of-unstyled-content (FOUC) on page load
  • Light mode inverts the zinc color scale so the app looks natural in either mode
  • Smooth 175ms transitions on color changes (excluding images and video)

Your preference persists across sessions and browser restarts.