# UTC Orbit vs LSTclock

The clearest difference is review sentiment: UTC Orbit at 100% against LSTclock's 55%. UTC Orbit also leads on rating (5.0 vs 3.8). LSTclock's advantage is update cadence (every 2 months vs every 8 months) and ratings volume (10 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

UTC Orbit holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: LSTclock has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of UTC Orbit's written reviews are positive against 55% of LSTclock's.

UTC Orbit ships an update every 8 months, LSTclock every 2 months. The most recent releases landed on September 15, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | UTC Orbit | LSTclock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/utc-orbit/id1049069115/reviews)** | [3.8 (10 ratings)](https://appshunter.io/ios/app/lstclock-sidereal-time-clock/id1510148631/reviews) |
| Number of ratings | 2 | **10** |
| Positive reviews | **100.0% of reviews** | 54.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 2 MB | 15 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Dave Massey](https://appshunter.io/developer/1029584286) | [Tsuyoshi Sawada](https://appshunter.io/developer/1510148630) |

## What reviewers say

### UTC Orbit

[App page](https://appshunter.io/ios/app/utc-orbit/id1049069115)

This utility converts between human-readable dates and a YYDDD.FFFFFF format essential for spacecraft orbital element calculations. It also features a UTC alarm clock based on the day of the year and a large digit UTC display.

**Highlights:** UTC time conversion, YYDDD.FFFFFF format display, UTC alarm clock, Day of Year alarm setting, Large digit UTC clock display, Background alarm notifications

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is UTC Orbit free?

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

### Is LSTclock free?

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

### Which has better reviews, UTC Orbit or LSTclock?

UTC Orbit is rated higher. UTC Orbit averages 5.0 out of 5 from 2 ratings, while LSTclock averages 3.8 from 10 ratings.

### Do UTC Orbit or LSTclock have ads?

Neither UTC Orbit nor LSTclock shows ads.

### Which is updated more often, UTC Orbit or LSTclock?

UTC Orbit ships an update every 8 months, and LSTclock every 2 months. Most recently, UTC Orbit was updated on September 15, 2026 and LSTclock on September 26, 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.*