Framework: User Need Analysis -> Accessibility & Ergonomics -> Business Impact vs Engineering Cost -> Phased Rollout.
1. User Need & Market Context:
- Assess user demographic and usage context: If users spend 4+ hours daily in the tool (developers, analysts, traders), dark mode significantly reduces eye strain in low-light environments.
- Review customer requests and community feedback on our roadmap boards.
2. Technical & Design Cost:
- If the application uses design tokens and Tailwind CSS/CSS variables, implementing dark mode is straightforward token mapping.
- If hardcoded hex values are scattered across 200 components, engineering cost is substantially higher and requires refactoring first.
3. Decision Matrix:
- If developer/high-session-duration product AND tokens exist -> Build as high-priority user satisfaction initiative.
- Respect system settings by default (prefers-color-scheme) with a manual toggle in user settings.
4. Success Metrics:
- Adoption rate (% of users who keep dark mode active), reduction in night-time session bounce rates, user satisfaction (CSAT).