CalStack
Your day, stacked clearly
$4.99
Your day by the hour, your plans two years out. Calendar, world clocks, tasks, with email context in one dashboard, with a private assistant that knows your schedule.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Fixes and improvements:
• Remove a world clock with a long press (right-click on Mac). Deleted clocks now stay deleted.
• Deleting your active clock hands off cleanly to the next one.
• The emailed time list is easier to scan: time and zone first, then city.
• New Email Support link in Settings under Privacy & Data.
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.
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.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Pick Two Productions Inc
