LSTclock vs iOptron Commander (iOS)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LSTclock
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.
- Local sidereal time display
- Julian Date calculation
- Supports multiple registered locations
- Location sync between iPhone and Apple Watch
- Date and time specific calculations
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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).
iOptron Commander (iOS)
Control your iOptron telescope mount remotely using your iOS device. This utility allows for basic functions like slewing to celestial objects, syncing time and location, and managing compatible mount series.
- Remote telescope mount control
- Slew to stars and deepsky objects
- Sync time and site from iOS
- Supports HEM, HAE, HAZ, CEM, GEM series mounts
- Basic control functions
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This is an application for owner of iOptron telescope mounts to remote control their telescope mounts via iOS devices. This lite version has some basic function such as slew to famous stars, named deepsky objects, solar system, sync time and site from iOS devices, and etc. Compatible product list: All HEM series All HAE series All HAZ.series CEM120 series CEM70 series GEM45 series CEM40 series GEM28 series CEM26 series SkyHunter
Screenshots
Verdict
The clearest difference is review sentiment: LSTclock at 55% against iOptron Commander (iOS)'s 6%. LSTclock also leads on rating (3.8 vs 1.9) and update cadence (every 2 months vs every 6 months). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
LSTclock holds the better App Store score, 3.8 against 1.9. Both are backed by a comparable volume of ratings — 10 and 14 respectively. Written reviews point the same way: 55% of LSTclock's written reviews are positive against 6% of iOptron Commander (iOS)'s.
LSTclock ships an update every 2 months, iOptron Commander (iOS) every 6 months. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.
| Parameter | LSTclock | iOptron Commander (iOS) |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (10 ratings) — better | 1.9 (14 ratings) |
| Positive reviews | 54.5% of reviews — better | 6.3% of reviews |
| Number of ratings | 10 | 14 — better |
| Update frequency | Every 2 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 17.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 15 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Tsuyoshi Sawada | 成城 徐 |
Customer experience
LSTclock
iOptron Commander (iOS)
In-app purchases
LSTclock
No in-app purchases
iOptron Commander (iOS)
No in-app purchases
Questions
Is LSTclock free?
Is iOptron Commander (iOS) free?
Which has better reviews, LSTclock or iOptron Commander (iOS)?
Do LSTclock or iOptron Commander (iOS) have ads?
Which is updated more often, LSTclock or iOptron Commander (iOS)?
Other comparisons
