# Tiantong Modem vs CSJ Pro

The clearest difference is iOS requirement: Tiantong Modem at 13.1 against CSJ Pro's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Tiantong Modem ships an update fortnightly, CSJ Pro every 9 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Tiantong Modem | CSJ Pro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free | — |
| Size | 86 MB | 53 MB |
| Requires iOS | **13.1** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [CHINA TELECOM Corporation Ltd.](https://appshunter.io/developer/513836032) | [元明 苏](https://appshunter.io/developer/1429356686) |

## What reviewers say

### Tiantong Modem

[App page](https://appshunter.io/ios/app/tiantong-modem/id6578450401)

This satellite communication software allows you to stay connected via satellite links when cellular service is unavailable. It ensures safety and connectivity in remote areas without network infrastructure.

**Highlights:** Satellite communication, Offline connectivity, Remote area access, Safety features, Network independent

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

**In-app purchases:** none


### CSJ Pro

[App page](https://appshunter.io/ios/app/csj-pro/id6761751269)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tiantong Modem free?

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

### Is CSJ Pro free?

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

### Do Tiantong Modem or CSJ Pro have ads?

Neither Tiantong Modem nor CSJ Pro shows ads.

### Which is updated more often, Tiantong Modem or CSJ Pro?

Tiantong Modem ships an update fortnightly, and CSJ Pro every 9 days. Most recently, Tiantong Modem was updated on October 24, 2026 and CSJ Pro on October 24, 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.*