International Fixed Calendar vs LSTclock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
International Fixed Calendar
Explore an alternative calendar system with 13 equal months. This app provides access to the International Fixed Calendar, featuring widgets and Apple Watch integration for easy date checking. Discover a historical calendar reform used by Kodak.
- International Fixed Calendar display
- Widgets for quick access
- Apple Watch app
- Apple Watch Complications
- Historical calendar information
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This app will allow you to check dates on the International Fixed Calendar. It also includes widgets, an Apple Watch App, and Apple Watch Complications so you can always know which date it is! The International Fixed Calendar was a planned calendar reform which added a new month, Sol, between June and July. The International Fixed Calendar therefore had 13 equal months fixed in size with 28 days each. The calendar system brought a number of great benefits, but humanity decided it would be a better idea to have another giant war instead and the plans were shelved. Good job humanity! Despite this the Kodak company used the calendar internally between 1928 and 1989. If you're a time traveling Kodak employee who owns an Apple Watch then this is the app for you!
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: LSTclock at 3.8 against International Fixed Calendar's 3.2. LSTclock also leads on update cadence (every 2 months vs every 8 months). On price, review sentiment, ratings volume and ads 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 3.2. Both are backed by a comparable volume of ratings — 12 and 10 respectively. Written reviews point the same way: 47% of International Fixed Calendar's written reviews are positive against 55% of LSTclock's.
International Fixed Calendar ships an update every 8 months, LSTclock every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | International Fixed Calendar | LSTclock |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (12 ratings) | 3.8 (10 ratings) — better |
| Positive reviews | 46.7% of reviews | 54.5% of reviews — better |
| Number of ratings | 12 — better | 10 |
| Update frequency | Every 8 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple TV, Apple Watch — better | iPhone, iPad, Apple Watch |
| Requires iOS | 17.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Darren Maxwell | Tsuyoshi Sawada |
Customer experience
International Fixed Calendar
LSTclock
In-app purchases
International Fixed Calendar
No in-app purchases
LSTclock
No in-app purchases
Questions
Is International Fixed Calendar free?
Is LSTclock free?
Which has better reviews, International Fixed Calendar or LSTclock?
Do International Fixed Calendar or LSTclock have ads?
Which is updated more often, International Fixed Calendar or LSTclock?
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