LSTclock vs Rheba Clock
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).
Rheba Clock
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This is a clock/watch app that keeps time in minutes and seconds in a unique way. Each circle represents a unit of time. Check out the seconds view to figure out the pattern
Screenshots
Verdict
The clearest difference is update cadence: Rheba Clock at daily against LSTclock's every 2 months. Rheba Clock also leads on iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
LSTclock ships an update every 2 months, Rheba Clock daily. The most recent releases landed on September 26, 2026 and October 6, 2026 respectively.
| Parameter | LSTclock | Rheba Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (10 ratings) — better | — |
| Positive reviews | 54.5% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Requires iOS | 17.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Tsuyoshi Sawada | Adam Trubnikov |
In-app purchases
LSTclock
No in-app purchases
Rheba Clock
No in-app purchases
Questions
Is LSTclock free?
Is Rheba Clock free?
Do LSTclock or Rheba Clock have ads?
Which is updated more often, LSTclock or Rheba Clock?
Other comparisons
