# 33eSIM vs Mars Signal

The clearest difference is update cadence: Mars Signal at weekly against 33eSIM's monthly. 33eSIM's advantage is iOS requirement (13.0 vs 15.1). 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.

33eSIM ships an update monthly, Mars Signal weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | 33eSIM | Mars Signal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 26 MB | 23 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HK GOOD SPEED LIMITED](https://appshunter.io/developer/1886366534) | [ONE TREE HILL TECH LIMITED](https://appshunter.io/developer/1818085565) |

## What reviewers say

### 33eSIM

[App page](https://appshunter.io/ios/app/33esim/id6760813349)

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

**In-app purchases:** none


### Mars Signal

[App page](https://appshunter.io/ios/app/mars-signal/id6770787268)

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

**In-app purchases:** none


## Frequently asked questions

### Is 33eSIM free?

33eSIM is free to download, with no in-app purchases.

### Is Mars Signal free?

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

### Do 33eSIM or Mars Signal have ads?

Neither 33eSIM nor Mars Signal shows ads.

### Which is updated more often, 33eSIM or Mars Signal?

33eSIM ships an update monthly, and Mars Signal weekly. Most recently, 33eSIM was updated on October 31, 2026 and Mars Signal on October 31, 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.*