1. Home
  2. Topics
  3. Julian Calendar

Best Julian Calendar Apps

249+ iOS apps curated and reviewed

4.7 avg rating
16 free apps
Updated August 2026

Out of 249+ julian calendar apps on iOS, 16 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Julian Calendar Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Julian - Quick DatesJulian - Quick DatesFree4.8★ (4K)NoYesAug 2026
2Julian DateJulian DateFree4.8★ (2.7K)—NoAug 2026
3Julian CalendarJulian Calendar$1.994.6★ (56)NoNoAug 2026
4JulianDatrJulianDatrFree5.0★ (1)NoNoMay 2026
5CalendarCalendarFree4.9★ (1.5M)NoNoAug 2026
6365 Days Calendar365 Days Calendar$1.994.7★ (26)NoNoAug 2026
7One CalendarOne CalendarFree4.8★ (20K)NoYesAug 2026
8Yearly CalendarYearly CalendarFree—NoNoJun 2026

Top Picks for Julian Calendar

Julian - Quick Dates#1

Julian - Quick Dates by Juan Carlos Perez

Julian dates at a glance
Editor's Choice
🔧 Utilities
4.8😊(4K ratings)
FreeIn-App Purchases
Julian - Quick Dates screenshot 1
Julian - Quick Dates screenshot 2
Julian - Quick Dates screenshot 3
Julian - Quick Dates screenshot 4

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.

What We Love

  • 🚀 Excellent for work/professional use
  • 👍 Simple and easy to use
  • 👍 Helpful for daily tasks
  • 👍 Convenient complication on Apple Watch

Room to Improve

  • 🐛 Complication issues on Apple Watch (not updating, getting stuck)
  • 🐛 Date discrepancies between app and complication
  • 🐛 App not functioning properly after updates
Julian Date#2

Julian Date by Jevon Charles

Strong Contender
📊 Productivity
4.8😊(2.7K ratings)
FreeIn-App Purchases
Julian Date screenshot 1
Julian Date screenshot 2
Julian Date screenshot 3

Convert between standard calendar dates and Julian dates. Supports 5-digit and full Julian date formats, including time. Also allows conversion from Julian dates back to calendar dates.

What We Love

  • 🚀 Best Julian Date App
  • 👍 Great
  • 👍 Love this APP
  • 👍 Military

Room to Improve

  • 🤔 Could be improved
  • 🤔 Good but...
  • 🤔 Good app
Julian Calendar#3

Julian Calendar by Applorium Ltd

Date Converter, Day Calculator
Worth Considering
📚 Education
4.6(56 ratings)
$1.99
Julian Calendar screenshot 1
Julian Calendar screenshot 2
Julian Calendar screenshot 3

View various Julian Calendar dates, including short, long, and reduced Julian Dates. Supports Lock Screen and Home Screen widgets for easy access to date conversions and calculations.

More Julian Calendar apps to explore

4
JulianDatr
JulianDatr
JulianDatr
Optimize your time
Free

Track the remaining days and weeks in the year. This simple tool helps you visualize your time and optimize your schedule. Stay aware of your progress and plan accordingly.

Days remaining counterWeeks remaining counterYearly time visualization
📊 Productivity
(1)
free
5
Calendar
Calendar
Calendar
by Apple Inc.
Free

Organize your entire schedule in one place. View events from multiple accounts, manage tasks, and plan gatherings with others. Stay on top of appointments, holidays, and birthdays with customizable views and shared calendars.

Unified schedule viewEvent creation and editingTask management integration
📊 Productivity
(1.5M)
free
6
365 Days Calendar
365 Days Calendar
365 Days Calendar
Julian & day tracker
$1.99

This utility app converts between Julian and Gregorian dates and tracks Julian Day Numbers. It's designed for users in fields like astronomy, military operations, and historical research who need precise date management for daily operations.

Julian to Gregorian date conversionGregorian to Julian date conversionJulian Day Number tracking
🔧 Utilities
(26)
paid
7
One Calendar
One Calendar
One Calendar
All calendars in ONE place!
Free

Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.

Integrates multiple calendar providersEasy-to-read overviewManage appointments and events
📊 Productivity
(20K)
free with in-app purchases
8
Yearly Calendar
Yearly Calendar
Yearly Calendar
by Slower Ltd
Free
📊 Productivity
(0)
9
Julianator
Julianator
Julianator
Julian Day of Year Calculator
$0.99
$1.99 | 50% OFF

Easily convert dates between the Gregorian calendar and the Julian Day of Year (ordinal date). This tool is useful for systems that use day-of-year numbering, such as mainframes, military, and food industries. It offers a clean interface, monthly views, and widgets for quick access.

Gregorian to Julian Day of Year conversionJulian Day of Year to Gregorian conversionMonthly calendar view
🔧 Utilities
(111)
free
10
Namedays & Birthdays Calendar
Namedays & Birthdays Calendar
Namedays & Birthdays Calendar
All important dates at glance
Free
🔧 Utilities
(0)
11
Jewish Calendar & Converter
Jewish Calendar & Converter
Jewish Calendar & Converter
Hebrew Date-Converter Holidays
Free

This app converts between Gregorian and Hebrew calendar dates. It offers reminders for holidays and birthdays, along with useful utilities like a calculator and world clock. A to-do list and historical information are also included.

Hebrew to Gregorian date conversionGregorian to Hebrew date conversionHoliday reminders
📊 Productivity
(195)
free
12
trueCalendar
trueCalendar
trueCalendar
by John Chambers
Free
🌟 Lifestyle
(0)
13
Monthly - Custom Calendar
Monthly - Custom Calendar
Monthly - Custom Calendar
Design Your Month
Free

This app transforms your monthly schedule into a personalized canvas. Organize appointments, tasks, and notes, then decorate each day with photos, emojis, and stickers to create a visual diary of your month.

Monthly calendar viewOrganize schedules, tasks, notesDecorate with stickers and photos
🌟 Lifestyle
(0)
freemium
14
gTasks for Google Tasks
gTasks for Google Tasks
gTasks for Google Tasks
Google Tasks Manager and Todo
Free

Manage your to-do lists and tasks by syncing them with Google Tasks and across your Apple devices. Organize tasks with subtasks, set location-based and repeating reminders, and view tasks alongside calendar events. Share tasks with colleagues for seamless collaboration.

Sync with Google TasksCross-device sync (iPhone, iPad, Mac)View tasks and calendar events together
📊 Productivity
(2.8K)
freemium
15
Calendar®
Calendar®
Calendar®
Make Your Own Desktop Calendar
$4.99
🔧 Utilities
(0)
16
Time Line Calendar
Time Line Calendar
Time Line Calendar
The new way to view your time
Free
🔧 Utilities
(0)
17
Caledari: AI Calendar Planner
Caledari: AI Calendar Planner
Caledari: AI Calendar Planner
Booking link & calm planner
Free
$3.99 | 100% OFF
📊 Productivity
(0)
18
Calendar Translator
Calendar Translator
Calendar Translator
by Geoffrey Domm
Free
🔍 Reference
(0)
19
AnyCalendar
AnyCalendar
AnyCalendar
World calendar converter
Free
🔧 Utilities
(0)
20
Roots Calendar
Roots Calendar
Roots Calendar
a 13 month calendar app
Free
🌟 Lifestyle
(0)

FAQ about Julian Calendar

What are the best julian calendar apps for iPhone?
Julian - Quick Dates tops our julian calendar apps ranking as of August 2026, with a 4.8-star average from 4K App Store ratings, and it's free to download.
Yes — 16 of the top julian calendar apps we rank are free to download, including Julian - Quick Dates and Julian Date.
Julian - Quick Dates has no ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 249+ julian calendar apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
Julian is a utility app that allows you to view and convert between 11 different types of dates. These include various Julian date formats, Mars Sol Date, Rata Die, and Unix Time. It also offers a calendar for easy date navigation and the ability to copy dates to your clipboard.
Key features include support for 11 distinct date types, a calendar for browsing dates, one-tap copying of dates to the clipboard, displaying the current date on the app icon via the badge number, and Apple Watch complications for at-a-glance date viewing.