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LSTclock: sidereal time clock

Tsuyoshi Sawada

App Store★ 3.8FreeFirst seen 3 Nov 2026

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App info

Category: Utilities
Age rating: 4+
Price: Free
Version: 10.0
Released: Apr 26, 2020
Last updated: 22 Oct 2026
Size: 21.5 MB
Requires: iOS 18.0 or later
Languages: 1

3.810 ratings

★★★★★

Average rating on the App Store. Apple doesn't publish how many ratings each star has.

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What's newin version 10.0

- Dropped support for iOS/iPadOS 17 and watchOS 10 (sorry for the inconvenience). - Modified the layout of the Main screen to adapt to iPhone Duo (iOS/iPadOS). - Fixed some issues on iOS/iPadOS 27: the "Play/Pause" button behaved unexpectedly; "Share" from Maps app did not work. - UI tweaks. - New icon.

About this app

Read full description

LSTclock is an iOS/iPadOS/watchOS app that displays the local sidereal time (LST) at registered location(s). On iOS/iPadOS, it can also calculate LST and Julian Date for any date and time. The list of locations can be synced between iPhone and paired Apple Watch(es).