LSTclock vs Back translation
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).
Back translation
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Perform back translation at the same time The accuracy of the translation result is expressed as a score (0.0 to 1.0) indicating the degree of semantic similarity between the original sentence and the translated sentence. The evaluation value is calculated by sentence embedding (two strings are expressed as vectors and the distance between the two vectors). The evaluation value is the semantic distance between two sentences, and the higher the similarity (the higher the translation accuracy), the higher the value is 0.
Screenshots
Verdict
The clearest difference is ads: LSTclock at none against Back translation's shown. Back translation's advantage is update cadence (fortnightly vs every 2 months). On price, in-app purchases, device support and iOS requirement 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, Back translation fortnightly. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.
| Parameter | LSTclock | Back translation |
|---|---|---|
| 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 | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 18.0 | 18.0 |
| Further details — not scored | ||
| Size | 22 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Tsuyoshi Sawada | Hideaki Uchikoshi |
In-app purchases
LSTclock
No in-app purchases
Back translation
No in-app purchases
Questions
Is LSTclock free?
Is Back translation free?
Do LSTclock or Back translation have ads?
Which is updated more often, LSTclock or Back translation?
Other comparisons
