Krono: Shift Work Calendar

Krono is the ultimate app for shift workers and professionals with rotating schedules: healthcare staff (doctors, nurses, attendants), law enforcement & emergency services (police, firefighters, security), industrial workers, and 24/7 transport operators. Organize your work life, track your hours, and balance your personal time effortlessly with this clean, visual, and automated schedule tracker.

🌟 KEY FEATURES:

⚙️ CYCLIC PATTERNS & AUTOMATIC ROTATIONS
• Apply predefined shift sequences in a single tap: Continental, DuPont, 2-2-3, 4-on/4-off, 5x2, 6x2, or build your custom cycle with any combination of work and rest days.
• Automatic infinite projection: set your initial anchor date and Krono projects your shifts seamlessly into both the future and the past.
• Individual exceptions: easily swap or modify single days without breaking your overall rotation pattern.

📅 ADVANCED DATE-RANGE ASSIGNMENT
• Single Shift: Apply the same shift to any custom block of days using quick-access shortcuts (7, 14, or 30 days, month-end, 3 months) or a free date picker. Ideal for vacations or sick leaves.
• Bounded Rotating Sequence: Assign a temporary rotation pattern restricted strictly to a specific date interval without overwriting your perpetual roster.

🏷️ SHIFT LIBRARY
• Fully customizable catalog: configure shift names, short codes, start/end times, calculated hours, work-hour rules, and colors with a custom opacity slider.
• Dual Shifts & On-Call Support: easily add a secondary backup shift or a complementary on-call duty to any day.

☁️ CLOUD SYNC & SHARED ROSTERS
• Live team collaboration: share shift calendars with colleagues or family using an easy 6-character invite code.
• Instant two-way synchronization: shift updates, daily notes, manual overrides, and alert reminders sync automatically in real time across all members.
• Safe local schedules: joining a shared calendar preserves your existing personal rosters on your device without overwriting them.

🎨 VISUAL PERSONALIZATION & VIP PERKS
• 360° VIP Color Wheel & HEX Codes: enjoy a continuous color picker with precision opacity and brightness adjustments for every shift.
• 3 Calendar Layout Styles: choose between Modern (smooth rounded cards), Classic (traditional defined borders), or Minimalist (clean monthly agenda view).
• Dynamic Themes: full compatibility with Material You (Android 12+) matching your wallpaper, alongside dark AMOLED.
• 5 Interchangeable VIP App Icons.

⏰ SMART ALARM CLOCKS & REMINDERS
• Pre-shift Alarms: set custom wake-up triggers linked directly to your shift entry times (exactly on time, 15m, 30m....
• Standalone Reminders: program separate alerts with multiple snooze repetitions and highly adjustable time intervals.

📊 LIVE STATISTICS & AGENDA VIEW
• Real-time work counters: track total hours worked, full shifts, days off, night hours, and overtime on the fly.
• Monthly & Annual overviews with crystal-clear charts breaking down your schedule distribution.

📄 EXPORT TO PDF & ICALENDAR (.ICS)
• Print-ready A4 PDF: export your rosters monthly (1 month per page) or in a compact format (2 months per page) to share via WhatsApp or email.
• Universal iCalendar (.ics) export: sync directly with your phone's native calendar, Google Calendar, Outlook, or Apple Calendar.

📱 4 HOME SCREEN WIDGETS
• 4 Custom Widgets: Monthly Calendar View, Upcoming Shifts Agenda, Shift of the Day, and Monthly Summary.
• 3 Unified Quick-Access Buttons: uniform shortcuts on all widgets to view Weather/Climate, Alarms/Clock, and the Annual Calendar view.
• Free Resizing: fully responsive dimensions (3x3, 4x3, 4x4, 4x5, or full screen) matching any Android launcher.

🔒 ABSOLUTE PRIVACY & 100% CLEAN
• No invasive ads for any user.
• No accounts or mandatory sign-ups: all databases reside locally inside your device (Room/SQLite storage).
• Complete local backups using standard JSON formats.