# MARSS vs Eclipse Countdown

The clearest difference is price: MARSS at Free against Eclipse Countdown's $1.99. MARSS also leads on update cadence (every 5 days vs monthly) and iOS requirement (12.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

MARSS is free to download; Eclipse Countdown costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MARSS ships an update every 5 days, Eclipse Countdown monthly. The most recent releases landed on October 9, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | MARSS | Eclipse Countdown |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Monthly |
| Monetization | — | Paid |
| Size | 257 MB | 49 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [INAF Osservatorio Astronomico di Brera](https://appshunter.io/developer/1669242323) | [BESSELIAN ELEMENTS PTY LTD](https://appshunter.io/developer/1896001781) |

## What reviewers say

### MARSS

[App page](https://appshunter.io/ios/app/marss/id1669242321)

**Features:** macOS Compatibility

**In-app purchases:** none


### Eclipse Countdown

[App page](https://appshunter.io/ios/app/eclipse-countdown/id6746715829)

This astronomical tool provides precise sub-second solar eclipse timings and interactive maps. It guides users through the eclipse experience with real-time calculations, audio cues, and a list of phenomena to observe.

**Highlights:** Precision timing engine, Interactive mapping, Live audio synchronization, List of phenomena to observe, Lunar limb profile corrections, 3D computational models

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

**In-app purchases:** none


## Frequently asked questions

### Is MARSS free?

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

### Is Eclipse Countdown free?

Eclipse Countdown costs $1.99, with no in-app purchases.

### Do MARSS or Eclipse Countdown have ads?

Neither MARSS nor Eclipse Countdown shows ads.

### Which is updated more often, MARSS or Eclipse Countdown?

MARSS ships an update every 5 days, and Eclipse Countdown monthly. Most recently, MARSS was updated on October 9, 2026 and Eclipse Countdown on October 14, 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.*