Local Sidereal Time vs LSTclock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Local Sidereal Time
This app calculates local sidereal time, a system astronomers use to locate celestial objects. It can also be used for personal development, with studies suggesting increased psychic abilities during specific sidereal times. The pro version offers advanced features like notifications and map-based calculations.
- Calculate local sidereal time
- Astronomy celestial object location
- Potential psychic ability enhancement
- Pro version notifications
- Pro version map-based calculation
- Pro version date/time conversion
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Sidereal helps you track local sidereal time from your current location or any place you want to check. It is designed for people interested in the 13:30 LST window discussed in remote-viewing literature, while also supporting any custom sidereal target you want to follow. Use Sidereal to: View a live local sidereal clock based on your current location Calculate local sidereal time manually from longitude, date, and time Search for a city or address and see the result with map support Generate the next 31 upcoming hits for your selected sidereal target Schedule the next 30 days of on-device alerts Export future times to CSV and export events to your calendar Customize your target LST, alert timing, full-window notifications, night viewing, and map visibility Sidereal starts with 13:30 LST as the default target, but you can change it in Settings to track any local sidereal time. The app includes a trial, with Pro unlocking continued access to advanced tools and planning features.
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).
Screenshots
Verdict
The clearest difference is rating: Local Sidereal Time at 4.7 against LSTclock's 3.8. Local Sidereal Time also leads on ratings volume (1.1K vs 10) and review sentiment (71% vs 55%). LSTclock's advantage is in-app purchases (none vs 1). On price, update cadence, ads and device support 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. Local Sidereal Time sells 1 one-off in-app purchase. LSTclock asks for nothing beyond the download.
Local Sidereal Time holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: Local Sidereal Time has 1.1K ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 71% of Local Sidereal Time's written reviews are positive against 55% of LSTclock's.
Local Sidereal Time ships an update every 4 months, LSTclock every 2 months. The most recent releases landed on September 21, 2026 and September 9, 2026 respectively.
| Parameter | Local Sidereal Time | LSTclock |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.1K ratings) — better | 3.8 (10 ratings) |
| Positive reviews | 70.7% of reviews — better | 54.5% of reviews |
| Number of ratings | 1.1K — better | 10 |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 20 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott Spiller | Tsuyoshi Sawada |
Customer experience
Local Sidereal Time
LSTclock
Bugs and requests
Local Sidereal Time
Reported bugs
4 issues- Alarm doesn't work
- Crashes when loading
- Notification issues
- Pro purchase restoration not working
Requested features
4 requests- Add alarm feature
- Allow setting location manually
- Improve notification handling
- Automatically adjust for daylight saving time
LSTclock
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Local Sidereal Time
- Pro$4.99
LSTclock
No in-app purchases
Questions
Is Local Sidereal Time free?
Is LSTclock free?
Which has better reviews, Local Sidereal Time or LSTclock?
Do Local Sidereal Time or LSTclock have ads?
Which is updated more often, Local Sidereal Time or LSTclock?
Other comparisons
