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.
3.8(10 ratings)
Free
Best apps like Emerald Geneva
34+ similar apps compared and reviewed
4.0 avg rating
6 free apps
Updated July 2026
Whether you want more options like Emerald Geneva or a completely different take on the same concept, our curated list of 34+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.
Top Alternatives to Emerald Geneva
3.6(93 ratings)
$1.99
This app offers an astronomically accurate moon display for your Apple Watch. It provides a visually pleasing indication of the moon's current phase and orientation, matching what you see in the sky. You can also explore future moon phases by rotating the digital crown.
4.7😊(1.1K ratings)
FreeIn-App Purchases
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.
What We Love
- 👍 Easy to use
- 🚀 Useful app
- 💡 Helpful notifications
- 👍 Great customer service
Room to Improve
- 🐛 Alarm doesn't work
- 🐛 Crashes frequently
- 🔒 Pro purchase issues
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iHorology
by Kaizen Writer
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This app simulates the functions of a mechanical watch on your phone or tablet. It offers a wide range of features found in real-world timepieces, including chronographs, calendars, and chiming functions. Experience the complexity of mechanical watches with customizable options.
Chronograph functions (split, flyback, monopusher)Perpetual and annual calendarsMinute repeaters and chiming features
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Atomic Clock (Gorgy Timing)
The classic par excellence
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This app provides ultra-precise time by syncing with atomic time servers. It features a customizable display mimicking professional studio clocks, with advanced alarm functions and various visual themes. Designed for accuracy and usability, it's ideal for professionals and enthusiasts alike.
Syncs with atomic time serversProfessional studio clock displayCustomizable alarm with snooze
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Sidereal Time
by Milan Battelino
$0.99
This utility app calculates and displays various types of sidereal time, including local apparent and Greenwich apparent sidereal time. It uses device location or manual input for longitude and time zones, and can synchronize with NTP servers for accurate timekeeping.
Local Apparent Sidereal Time (LAST) calculationGreenwich Apparent Sidereal Time (GAST) displayLongitude and Time Zone input
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Watch Tracker
by Tom Kerrigan
$4.99
Easily track your wristwatch's accuracy against an atomic clock. This app measures and records time differences, displaying detailed graphs of your watch's performance. It's designed to be more accurate and simpler than traditional methods.
Tracks wristwatch accuracySynchronizes with atomic clockMeasures and records time differences
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AtomicClock: NTP Time
Exact time from precise clocks
Free
This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.
Precise time from NTP serversCustomizable clock facesSelect or add time servers
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Radio Wave Sync
Sync Radio Controlled Watch
Free
This app helps synchronize radio-controlled watches by simulating time signal waves. It supports various international time signal standards and offers a 'Beast Mode' for faster synchronization. Simply place your watch near your device's speaker and start the process.
Simulates international time wave signalsSupports China, USA, Japan, Germany, and UK signalsUnique 'Beast Mode' for faster sync
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SwissConnect Analytics
by Manufacture Modules Technologies Sarl.
Free
Measure the accuracy and precision of your mechanical watches with this app. It provides real-time audio waveform visualization and detailed charts of your timepiece's performance. Supports a wide range of watch frequencies and includes an auto-detect feature.
Measure watch accuracyReal-time oscilloscope waveformPlotted results charts
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