Nametag is a personal relationships management application that combines contact tracking, relationship visualization, journaling, and synchronization capabilities. Built with Next.js 16, React 19, and TypeScript, it features a modular architecture with API routes, Prisma ORM with PostgreSQL, and extensive third-party integrations including Stripe for billing, Resend for email, and CardDAV for address book synchronization. The application offers both self-hosted and SaaS deployment options with tiered feature access (FREE/PERSONAL/PRO). Key architectural strengths include isolated utility modules, consistent API patterns, soft delete implementation, and comprehensive testing coverage. The codebase demonstrates modern development practices with attention to security, internationalization, and data privacy.