# JCSys Reference vs BIG Kaleidos

The clearest difference is update cadence: BIG Kaleidos at every 3 months against JCSys Reference's every 21 months. JCSys Reference's advantage is iOS requirement (10.0 vs 14.0). 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.

JCSys Reference ships an update every 21 months, BIG Kaleidos every 3 months. The most recent releases landed on June 5, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | JCSys Reference | BIG Kaleidos |
| --- | --- | --- |
| 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 | 54 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Graeme Watson](https://appshunter.io/developer/574479647) | [BIG vzw](https://appshunter.io/developer/1162783094) |

## 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


### BIG Kaleidos

[App page](https://appshunter.io/ios/app/big-kaleidos/id1162783095)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JCSys Reference free?

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

### Is BIG Kaleidos free?

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

### Do JCSys Reference or BIG Kaleidos have ads?

Neither JCSys Reference nor BIG Kaleidos shows ads.

### Which is updated more often, JCSys Reference or BIG Kaleidos?

JCSys Reference ships an update every 21 months, and BIG Kaleidos every 3 months. Most recently, JCSys Reference was updated on June 5, 2026 and BIG Kaleidos on September 10, 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.*