# International Fixed Calendar vs LSTclock

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.

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.

## The numbers

| Metric | International Fixed Calendar | LSTclock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (12 ratings)](https://appshunter.io/ios/app/international-fixed-calendar/id1107327564/reviews) | **[3.8 (10 ratings)](https://appshunter.io/ios/app/lstclock-sidereal-time-clock/id1510148631/reviews)** |
| Number of ratings | **12** | 10 |
| Positive reviews | 46.7% of reviews | **54.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 1 MB | 22 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad, Apple TV, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Darren Maxwell](https://appshunter.io/developer/336341197) | [Tsuyoshi Sawada](https://appshunter.io/developer/1510148630) |

## What reviewers say

### International Fixed Calendar

[App page](https://appshunter.io/ios/app/international-fixed-calendar/id1107327564)

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.

**Highlights:** International Fixed Calendar display, Widgets for quick access, Apple Watch app, Apple Watch Complications, Historical calendar information

**Features:** macOS Compatibility

**In-app purchases:** none


### LSTclock

[App page](https://appshunter.io/ios/app/lstclock-sidereal-time-clock/id1510148631)

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.

**Highlights:** Local sidereal time display, Julian Date calculation, Supports multiple registered locations, Location sync between iPhone and Apple Watch, Date and time specific calculations

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is International Fixed Calendar free?

International Fixed Calendar is free to download, with no in-app purchases.

### Is LSTclock free?

LSTclock is free to download, with no in-app purchases.

### Which has better reviews, International Fixed Calendar or LSTclock?

LSTclock is rated higher. International Fixed Calendar averages 3.2 out of 5 from 12 ratings, while LSTclock averages 3.8 from 10 ratings.

### Do International Fixed Calendar or LSTclock have ads?

Neither International Fixed Calendar nor LSTclock shows ads.

### Which is updated more often, International Fixed Calendar or LSTclock?

International Fixed Calendar ships an update every 8 months, and LSTclock every 2 months. Most recently, International Fixed Calendar was updated on November 2, 2026 and LSTclock on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*