Master the art of calculating weekdays for any date with this comprehensive educational app. Learn a proven technique, practice with interactive exercises, and track your progress to sharpen your mental arithmetic skills.





187+ iOS apps curated and reviewed
Every iPhone needs a few good doomsday method apps. We benchmark 187+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | Free | 5.0★ (2) | No | No | May 2026 | |
| 2 | Free | 4.7★ (799) | No | No | Jul 2026 | |
| 3 | Free | 4.7★ (10K) | No | No | Jul 2026 | |
| 4 | Free | 4.6★ (2.1K) | No | Yes | Jul 2026 | |
| 5 | Free | 4.5★ (169) | Yes | Yes | Jul 2026 | |
| 6 | Free | 4.8★ (2.2K) | No | Yes | Jul 2026 | |
| 7 | Free | 4.6★ (1.9K) | No | Yes | Jul 2026 | |
| 8 | Free | 4.7★ (2.2K) | No | No | Jul 2026 |





Master the art of calculating weekdays for any date with this comprehensive educational app. Learn a proven technique, practice with interactive exercises, and track your progress to sharpen your mental arithmetic skills.





Calculate the duration of a presidential term, including elapsed days, remaining days, and future projections. It also functions as a general date calculator for any two dates or time periods.






This app provides a comprehensive Persian (Jalali) calendar for iPhone, iPad, and Apple Watch. It includes date conversion tools and multiple widgets for easy access to your schedule. You can also log events directly into your system calendar.


This app offers a comprehensive calendar experience, including traditional Chinese almanac information, holiday schedules, and weather forecasts. It also provides tools for managing personal events and schedules, ensuring you stay organized and informed about important dates and daily activities.




Track the exact days, hours, and sleeps until Christmas Eve with a live home screen widget. Customize with festive themes and enjoy snowfall animations to bring the holiday spirit to life.


This app helps you create flexible, color-coded daily schedules by time blocking tasks. It's designed for individuals who struggle with traditional planning, offering features like drag-and-drop task management and adaptive scheduling that adjusts to life's changes. Syncs with calendars and reminders across devices.


Discover historical events, holidays, and astronomical data for any given day. This app provides daily insights into history, sunrise/sunset times, moon phases, and planetary alignments without requiring an internet connection.


This app provides a quick and efficient way to view and convert between 11 different types of dates, including standard Julian dates, Mars Sol dates, and Unix time. It features a calendar for easy navigation and allows copying dates to the clipboard. The current date can be displayed on the app icon and Apple Watch complications.


This app provides a versatile tool for generating random numbers, letters, and making decisions. It offers various randomization features like dice rolling, coin flipping, and custom list selection. Users can also utilize widgets and Apple Watch integration for quick access to random outcomes.


This app provides detailed Khmer dates for 2025, including Cambodian holidays and religious ceremonies. It also offers horoscope readings, feng shui tools, weather forecasts, and currency exchange rates, working offline for convenience.


This comprehensive toolkit helps manage time, dates, and schedules with various calculators. Track work hours, plan shifts, convert time formats, and calculate differences between dates. Ideal for professionals, freelancers, and everyday users needing precise time management.


Explore your birth chart and gain insights into your life and future through detailed horoscopes. Understand planetary influences, check compatibility, and discover astrological events with this comprehensive astrology app.


Track the exact time remaining until Christmas and New Year's Day. Offers multiple countdown modes, including days, hours, minutes, and seconds, with convenient widget display. Includes iMessage stickers for festive communication.


This app integrates ancient astrological wisdom into your daily planning, rituals, and self-care. It offers personalized insights, time management tools, and a 180-day astro-planner to help you sync your life with cosmic rhythms and enhance self-improvement.


Easily convert between Gregorian and Hijri dates with this utility app. It offers a widget for quick conversions, time travel calculations between dates, and support for Islamic events. Users can also adjust the Hijri date and receive daily reminders.


This app converts Jewish and regular dates, displays Jewish holidays and significant events, and shows Torah readings. It also provides prayer times worldwide and includes a Siddur for daily services. It offers offline functionality and customizable settings.


Track upcoming and past events with a smart reminder app. Count down to special occasions like birthdays and holidays, or reflect on past milestones. Receive timely notifications and customize your experience with various wallpapers and backgrounds.


Track time until or since important events with customizable timers. Set up countdowns for birthdays, holidays, and vacations, or count up from anniversaries and special dates. Share your event timers with friends and family.


This app transforms spoken plans into a structured daily schedule using advanced AI. It's designed to help users, especially those with ADHD or busy minds, organize their day without the stress of typing. Get smart suggestions and integrate existing calendars for a seamless planning experience.