# Cosmic Kronos vs Lunar Observer

The clearest difference is update cadence: Cosmic Kronos at every 8 days against Lunar Observer's every 5 weeks. Cosmic Kronos also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Cosmic Kronos ships an update every 8 days, Lunar Observer every 5 weeks. The most recent releases landed on September 15, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | Cosmic Kronos | Lunar Observer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/lunar-observer/id6762546936/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 5 weeks |
| Monetization | — | Free |
| Size | 102 MB | 329 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Cheng-Ta Hsieh](https://appshunter.io/developer/1111361894) | [Humoud Salmeen](https://appshunter.io/developer/1894626699) |

## What reviewers say

### Cosmic Kronos

[App page](https://appshunter.io/ios/app/cosmic-kronos/id6759821998)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lunar Observer

[App page](https://appshunter.io/ios/app/lunar-observer/id6762546936)

Track the moon's phases, illumination, and rise/set times with precise astronomical calculations. View upcoming solar and lunar eclipses, and access a Hijri calendar. Get optional notifications for celestial events and enjoy an authentic Arabic interface.

**Highlights:** Precise moon phase and illumination tracking, Sunrise, sunset, moonrise, moonset times, Upcoming solar and lunar eclipse coverage, Hijri calendar with moon phase markers, Customizable notifications for celestial events, Choice of NASA imagery or 3D terrain model, Full Arabic localization

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cosmic Kronos free?

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

### Is Lunar Observer free?

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

### Do Cosmic Kronos or Lunar Observer have ads?

Neither Cosmic Kronos nor Lunar Observer shows ads.

### Which is updated more often, Cosmic Kronos or Lunar Observer?

Cosmic Kronos ships an update every 8 days, and Lunar Observer every 5 weeks. Most recently, Cosmic Kronos was updated on September 15, 2026 and Lunar Observer on September 1, 2026.

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