Best apps like International Fixed Calendar

10+ similar apps compared and reviewed

4.4 avg rating
8 free apps
Updated September 2026

International Fixed Calendar is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.

Top Alternatives to International Fixed Calendar

Calculator Smart#3

Calculator Smart by Miroslav Otsedarski

Scientific & Standard Calc
Worth Considering
🔧 Utilities
4.7(494 ratings)
FreeAdsIn-App Purchases
Calculator Smart screenshot 1
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This app offers a powerful and precise calculator for everyday math and advanced scientific computations. It features a clean interface with large buttons, supporting complex equations, multiple modes, and intuitive input methods. Personalize your experience with colorful skins and custom icons.

More apps like International Fixed Calendar

4
LSTclock: sidereal time clock
LSTclock: sidereal time clock
LSTclock: sidereal time clock
Local sidereal time clock
Free

This utility app displays local sidereal time for registered locations on iOS, iPadOS, and watchOS. It can also calculate sidereal time and Julian Date for any date and time, and sync locations between devices.

Local sidereal time displayJulian Date calculationSupports multiple registered locations
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5
Clock mini: World Clocks
Clock mini: World Clocks
Clock mini: World Clocks
Dock Clock, Timer, World Clock
Free

This app provides a world clock, allowing users to track time in multiple cities with customizable clock faces. It offers a gallery of designs and a subscription option for full access.

World clock for multiple citiesCustomizable clock facesClock face gallery
🔧 Utilities
(4)
free with in-app purchases
6
Local Sidereal Time
Local Sidereal Time
Local Sidereal Time
Local Sidereal Time
Free

This app calculates local sidereal time, a system astronomers use to locate celestial objects. It can also be used for personal development, with studies suggesting increased psychic abilities during specific sidereal times. The pro version offers advanced features like notifications and map-based calculations.

Calculate local sidereal timeAstronomy celestial object locationPotential psychic ability enhancement
🔧 Utilities
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7
Julianator
Julianator
Julianator
Julian Day of Year Calculator
$0.99

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
(117)
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8
MultiClock Civil/Solar/Metric
MultiClock Civil/Solar/Metric
MultiClock Civil/Solar/Metric
by Michael Olson
Free

This utility app displays time in multiple formats, including civil, solar, and metric. It offers a progress bar for the day's elapsed percentage and shows sunrise/sunset times. A converter tool allows for easy time conversions between different systems.

Civil time with DSTSolar time based on sun positionMetric time (10,000 units per day)
🔧 Utilities
(3)
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9
Network Speed Tester Client
Network Speed Tester Client
Network Speed Tester Client
by Lakehorn AG
Free

Measure your WiFi network's actual transfer speed with real-time graphical visualization. Optimize router placement and identify network bottlenecks for better performance. Requires a companion server application on your local network.

Measure WiFi transfer speedReal-time graphical visualizationOptimize router placement
🔧 Utilities
(10)
free
10
Flat Earth Sun, Moon & Zodiac
Flat Earth Sun, Moon & Zodiac
Flat Earth Sun, Moon & Zodiac
Flat Earth Clock
$5.99

Explore celestial mechanics from an alternative perspective. Track the sun and moon's positions, observe daily and seasonal cycles, and access educational content. Connect with a community, discover books, and visualize concepts like circumnavigation on a flat earth model.

Sun and moon position tracking on AE mapDaily educational videos and archiveCommunity connection with messaging and calls
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