# mariner 3S vs eThemis

The clearest difference is update cadence: eThemis at every 2 months against mariner 3S's every 9 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.

mariner 3S ships an update every 9 months, eThemis every 2 months. The most recent releases landed on September 13, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | mariner 3S | eThemis |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Size | 24 MB | 37 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mariner 3S AG](https://appshunter.io/developer/1593374907) | [Herborner Pumpentechnik GmbH & Co KG](https://appshunter.io/developer/1785170253) |

## What reviewers say

### mariner 3S

[App page](https://appshunter.io/ios/app/mariner-3s/id1593374905)

**Features:** macOS Compatibility

**In-app purchases:** none


### eThemis

[App page](https://appshunter.io/ios/app/ethemis/id6739421649)

**In-app purchases:** none


## Frequently asked questions

### Is mariner 3S free?

mariner 3S is free to download, with no in-app purchases.

### Is eThemis free?

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

### Do mariner 3S or eThemis have ads?

Neither mariner 3S nor eThemis shows ads.

### Which is updated more often, mariner 3S or eThemis?

mariner 3S ships an update every 9 months, and eThemis every 2 months. Most recently, mariner 3S was updated on September 13, 2026 and eThemis on September 9, 2026.

---

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