# LSTclock vs Tempus Tool

LSTclock and Tempus Tool are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | LSTclock | Tempus Tool |
| --- | --- | --- |
| 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 | — |
| Monetization | Free | — |
| Size | 15 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Tsuyoshi Sawada](https://appshunter.io/developer/1510148630) | [Gerard Coll Roma](https://appshunter.io/developer/1728668242) |

## 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


### Tempus Tool

[App page](https://appshunter.io/ios/app/tempus-tool/id6502044365)

**In-app purchases:** none


## Frequently asked questions

### Is LSTclock free?

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

### Is Tempus Tool free?

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

### Do LSTclock or Tempus Tool have ads?

Neither LSTclock nor Tempus Tool shows ads.

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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.*