# LSTclock vs Scan

The clearest difference is price: LSTclock at Free against Scan's $0.99. Scan's advantage is update cadence (every 2 days vs every 2 months) and iOS requirement (15.0 vs 18.0). On ads, in-app purchases and device support there is nothing between them.

LSTclock is free to download; Scan costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LSTclock ships an update every 2 months, Scan every 2 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | LSTclock | Scan |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 | **Every 2 days** |
| Monetization | Free | — |
| Size | 22 MB | 82 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tsuyoshi Sawada](https://appshunter.io/developer/1510148630) | [Petrus Arnoldus van Zyl](https://appshunter.io/developer/1641254381) |

## 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


### Scan

[App page](https://appshunter.io/ios/app/scan-ly/id6756291237)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is LSTclock free?

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

### Is Scan free?

Scan costs $0.99, with no in-app purchases.

### Do LSTclock or Scan have ads?

Neither LSTclock nor Scan shows ads.

### Which is updated more often, LSTclock or Scan?

LSTclock ships an update every 2 months, and Scan every 2 days. Most recently, LSTclock was updated on November 3, 2026 and Scan on October 30, 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.*