# LSTclock vs Rheba Clock

The clearest difference is update cadence: Rheba Clock at daily against LSTclock's every 2 months. Rheba Clock also leads on iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

LSTclock ships an update every 2 months, Rheba Clock daily. The most recent releases landed on September 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | LSTclock | Rheba Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (10 ratings)](https://appshunter.io/ios/app/lstclock-sidereal-time-clock/id1510148631/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 54.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free | — |
| Size | 15 MB | 0 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Tsuyoshi Sawada](https://appshunter.io/developer/1510148630) | [Adam Trubnikov](https://appshunter.io/developer/1746606147) |

## What reviewers say

### LSTclock

[App page](https://appshunter.io/ios/app/lstclock-sidereal-time-clock/id1510148631)

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.

**Highlights:** Local sidereal time display, Julian Date calculation, Supports multiple registered locations, Location sync between iPhone and Apple Watch, Date and time specific calculations

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Rheba Clock

[App page](https://appshunter.io/ios/app/rheba-clock/id6502721039)

**In-app purchases:** none


## Frequently asked questions

### Is LSTclock free?

LSTclock is free to download, with no in-app purchases.

### Is Rheba Clock free?

Rheba Clock is free to download, with no in-app purchases.

### Do LSTclock or Rheba Clock have ads?

Neither LSTclock nor Rheba Clock shows ads.

### Which is updated more often, LSTclock or Rheba Clock?

LSTclock ships an update every 2 months, and Rheba Clock daily. Most recently, LSTclock was updated on September 26, 2026 and Rheba Clock on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*