CalStack

Your day, stacked clearly

$4.99

Plan today. See two years ahead. Track milestones, tasks, time zones, and video calls alongside an assistant you control. CalStack is a personal command center for your calendar, email, tasks, notes, contacts, and AI assistant. Built for people who live across meetings, travel, family schedules, projects, and inboxes, CalStack brings the day into one focused view instead of scattering it across apps. See your day, upcoming week, pinned events, meetings, reminders, and time zones in a single dashboard. Use Start Day, Check In, and Wind Down rituals to turn your calendar, email, tasks, and notes into practical daily context. CalStack also includes an AI chatbot that can work with your local app context, including calendar events, synced notes, processed email, contacts, and saved preferences. You can connect supported AI providers or local model servers depending on your setup. Key features: • Unified calendar dashboard • Day, week, month, quarter, year, and list calendar views • Pinned and starred calendar events • Time zone dashboard with time scrubber • AI-assisted Start Day, Check In, and Wind Down workflows • Email sync and searchable email context • Brain notes and memory layer • Contact tracking • Meeting and video link support • Local model support for privacy-focused workflows • iCloud sync for supported app data • Native iPhone, iPad, and Mac layouts CalStack is designed to help you understand what matters today, prepare for what is coming next, and keep useful context close without turning your day into another inbox.

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CalStack is a calendar built to run real projects, from a single day out to two years. • See your whole timeline in month, quarter, year, and two-year views • Every video call in one place, with the join button right on the event • Pin milestones so they stay in front of you instead of scrolling away • World clocks for the time zones your team works across • A built-in assistant that plans your day from your calendar and email, and you bring your own AI, cloud or local • No account to create, and everything lives in your own iCloud This is the first release. More is on the way.

Version 1.1

The developer, Pick Two Productions Inc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Pick Two Productions Inc
    Size
    • 10.3 MB
    Category
    • Productivity
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • iPad
      Requires iPadOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Pick Two Productions Inc
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.