# JCSys Reference vs RDS 81346

The clearest difference is update cadence: RDS 81346 at every 3 months against JCSys Reference's every 21 months. JCSys Reference's advantage is iOS requirement (10.0 vs 16.4). 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.

JCSys Reference ships an update every 21 months, RDS 81346 every 3 months. The most recent releases landed on June 5, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | JCSys Reference | RDS 81346 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/jcsys-reference/id584340426/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 9 MB | 42 MB |
| Requires iOS | **10.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Graeme Watson](https://appshunter.io/developer/574479647) | [System Engineering AS](https://appshunter.io/developer/1110265192) |

## What reviewers say

### JCSys Reference

[App page](https://appshunter.io/ios/app/jcsys-reference/id584340426)

This application provides a comprehensive reference for Tactical Data Links (TDL) and MODAF. It includes detailed catalogues for Link 11, Link 16, and Link 22 messages, along with network participation group information and an acronym finder.

**Highlights:** Link 11 message catalogue, Link 16 message catalogue, Link 16 NPG list, Link 22 message catalogue, Knowledge test, MODAF View reference, Acronym finder

**Features:** macOS Compatibility

**In-app purchases:** none


### RDS 81346

[App page](https://appshunter.io/ios/app/rds-81346/id1110265193)

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

**In-app purchases:** none


## Frequently asked questions

### Is JCSys Reference free?

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

### Is RDS 81346 free?

RDS 81346 is free to download, with no in-app purchases.

### Do JCSys Reference or RDS 81346 have ads?

Neither JCSys Reference nor RDS 81346 shows ads.

### Which is updated more often, JCSys Reference or RDS 81346?

JCSys Reference ships an update every 21 months, and RDS 81346 every 3 months. Most recently, JCSys Reference was updated on June 5, 2026 and RDS 81346 on September 22, 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.*