# DEF ISL vs Cornerstone GEMS

The clearest difference is update cadence: Cornerstone GEMS at every 2 months against DEF ISL's every 12 months. DEF ISL'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.

DEF ISL ships an update every 12 months, Cornerstone GEMS every 2 months. The most recent releases landed on October 16, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | DEF ISL | Cornerstone GEMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/def-isl/id6447841373/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 63 MB | 55 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SRIJAY SOFTWARE SOLUTIONS PRIVATE LIMITED](https://appshunter.io/developer/1656364843) | [edumerge Solutions Private Limited](https://appshunter.io/developer/596343432) |

## What reviewers say

### DEF ISL

[App page](https://appshunter.io/ios/app/def-isl/id6447841373)

Learn sign language with over 50,000 signs and phrases presented through videos and illustrations. This app is designed for both adults and children, including those who are deaf or hearing impaired, to improve communication and societal connection.

**Highlights:** Extensive sign language library, Over 50,000 signs and phrases, In-built videos, Illustrations, Easy navigation, Accessible for all ages

**Features:** macOS Compatibility

**In-app purchases:** none


### Cornerstone GEMS

[App page](https://appshunter.io/ios/app/cornerstone-gems/id6776257277)

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

**In-app purchases:** none


## Frequently asked questions

### Is DEF ISL free?

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

### Is Cornerstone GEMS free?

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

### Do DEF ISL or Cornerstone GEMS have ads?

Neither DEF ISL nor Cornerstone GEMS shows ads.

### Which is updated more often, DEF ISL or Cornerstone GEMS?

DEF ISL ships an update every 12 months, and Cornerstone GEMS every 2 months. Most recently, DEF ISL was updated on October 16, 2026 and Cornerstone GEMS on September 28, 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.*