# I vs MARSS

The clearest difference is update cadence: MARSS at every 5 days against I's every 8 months. 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.

I ships an update every 8 months, MARSS every 5 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | I | MARSS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 days** |
| Size | 125 MB | 257 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eye-Tech Srl](https://appshunter.io/developer/1114846555) | [INAF Osservatorio Astronomico di Brera](https://appshunter.io/developer/1669242323) |

## What reviewers say

### I

[App page](https://appshunter.io/ios/app/i-rain/id1629877609)

**Features:** macOS Compatibility

**In-app purchases:** none


### MARSS

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is I free?

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

### Is MARSS free?

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

### Do I or MARSS have ads?

Neither I nor MARSS shows ads.

### Which is updated more often, I or MARSS?

I ships an update every 8 months, and MARSS every 5 days. Most recently, I was updated on October 7, 2026 and MARSS on October 9, 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.*