# SAJ vs SAT Messenger

The clearest difference is update cadence: SAT Messenger at every 2 weeks against SAJ's every 23 months. SAJ's advantage is iOS requirement (8.0 vs 15.0). 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.

SAJ ships an update every 23 months, SAT Messenger every 2 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SAJ | SAT Messenger |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 2 weeks** |
| Size | 152 MB | 51 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [SAJ Instrument Ab](https://appshunter.io/developer/962246290) | [phwy](https://appshunter.io/developer/1687040072) |

## What reviewers say

### SAJ

[App page](https://appshunter.io/ios/app/saj-dms-calib/id962246291)

**Features:** macOS Compatibility

**In-app purchases:** none


### SAT Messenger

[App page](https://appshunter.io/ios/app/sat-messenger/id6448937534)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SAJ free?

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

### Is SAT Messenger free?

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

### Do SAJ or SAT Messenger have ads?

Neither SAJ nor SAT Messenger shows ads.

### Which is updated more often, SAJ or SAT Messenger?

SAJ ships an update every 23 months, and SAT Messenger every 2 weeks. Most recently, SAJ was updated on November 1, 2026 and SAT Messenger on November 3, 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.*