Week Number Calendar
calendar with week numbers
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Week Number Calendar - ISO 8601 Standard
A simple, clean calendar built around ISO 8601 week numbers. Perfect for business planning, project management, and international coordination.
FREE:
- The number of the current week, always visible
- The calendar for the current year
- Current week and current day highlighted
- Available in English and Russian
PREMIUM SUBSCRIPTION:
- Every ISO 8601 week number, across the whole year
- Calendars for every year, past and future
ABOUT ISO 8601 WEEK NUMBERS:
Week numbers follow the international ISO 8601 standard, widely used in business worldwide. The first week of the year is the week containing the first Thursday, or equivalently, the week containing January 4th.
This standard ensures consistent week numbering across countries and organizations, making it ideal for:
- Business scheduling and planning
- Project timelines and milestones
- International team coordination
- Manufacturing and logistics
- Any work requiring precise week references
SUBSCRIPTION DETAILS:
Week Number Calendar Premium costs $0.99 per month and starts with a 7-day free trial. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. You can manage or cancel it at any time in your Apple Account settings.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://github.com/4id-me/week-calendar-support/blob/main/PRIVACY.md
Note: Due to the ISO 8601 standard, years can have 52 or 53 weeks, and dates near year boundaries may belong to the previous or next year's week count.
Ratings & Reviews
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Week Number Calendar Premium is here.
The app stays free for what most people open it for: the number of the current week and the calendar for the current year. A Premium subscription unlocks every week number and every year, and starts with a 7-day free trial.
Everyone who installed the app before this update keeps full access for free. Thank you for being early.
Also in this release:
- Language switcher in Settings: System, English or Russian
- Russian public holidays for 2026
The developer, Maksim Efremov, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Maksim Efremov
- Size
- 1.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Premium $0.99
- Copyright
- © 2025 Maksim Efremov