LSTclock vs Binary Clock by jhale.dev
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).
Binary Clock by jhale.dev
This utility displays time using binary code, representing numbers with illuminated dots. It offers personalization options and includes instructions for reading the binary time format. The application is open-source.
- Binary time display
- Customizable settings
- Instructions for binary time
- Open-source code
- Personalization options
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Instead of the digits 1, 2, 3, etc... this clock uses columns of dots that turn on and off like the 1s and 0s of the binary form of the number. Binary Clock also includes several settings you can use to personalize the clock to your liking. Just press and hold the clock to access them. If you don't know how to tell time on a Binary Clock, check out the instructions in the blog post announcing the app: https://links.jhale.dev/binaryclock Binary Clock is open-source! Check out the code yourself on GitHub: https://github.com/thehale/BinaryClock DISCLAIMER: All marketing pictures in this app store listing are designed to complement the nerdy theme of this app. The presence of various books in some marketing pictures in this app store listing does not imply an endorsement of this app by the authors of those publications. Those authors retain copyright and trademark rights to their works.
Screenshots
Verdict
The clearest difference is review sentiment: Binary Clock by jhale.dev at 100% against LSTclock's 55%. Binary Clock by jhale.dev also leads on rating (4.5 vs 3.8) and iOS requirement (15.1 vs 17.0). LSTclock's advantage is ratings volume (10 vs 2). On price, update cadence, 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.
Binary Clock by jhale.dev holds the better App Store score, 4.5 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: 55% of LSTclock's written reviews are positive against 100% of Binary Clock by jhale.dev's.
LSTclock ships an update every 2 months, Binary Clock by jhale.dev every 4 months. The most recent releases landed on September 9, 2026 and June 4, 2026 respectively.
| Parameter | LSTclock | Binary Clock by jhale.dev |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (10 ratings) | 4.5 (2 ratings) — better |
| Positive reviews | 54.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 — better | 2 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 15 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Tsuyoshi Sawada | Joseph Hale |
Customer experience
LSTclock
Binary Clock by jhale.dev
In-app purchases
LSTclock
No in-app purchases
Binary Clock by jhale.dev
No in-app purchases
Questions
Is LSTclock free?
Is Binary Clock by jhale.dev free?
Which has better reviews, LSTclock or Binary Clock by jhale.dev?
Do LSTclock or Binary Clock by jhale.dev have ads?
Which is updated more often, LSTclock or Binary Clock by jhale.dev?
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