# OpenGL ES Reference vs GT Graph

The clearest difference is in-app purchases: OpenGL ES Reference at none against GT Graph's 1. OpenGL ES Reference also leads on iOS requirement (8.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. GT Graph sells 1 one-off in-app purchase. OpenGL ES Reference asks for nothing beyond the download.

## The numbers

| Metric | OpenGL ES Reference | GT Graph |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/opengl-es-reference/id1056915836/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 8 days |
| Monetization | Free | — |
| Size | 22 MB | 1 MB |
| Requires iOS | **8.1** | 18.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Saumya Lahera](https://appshunter.io/developer/921732703) | [Gennaro Eduardo Tangari](https://appshunter.io/developer/1616502345) |

## What reviewers say

### OpenGL ES Reference

[App page](https://appshunter.io/ios/app/opengl-es-reference/id1056915836)

This app provides offline access to detailed descriptions of all OpenGL ES commands and functions from the official Khronos Group website. It's designed to help developers easily reference graphics API information, even for beginners.

**Highlights:** Complete OpenGL ES 3.2 command descriptions, Information from official Khronos Group website, Offline access, Systematic function listing, Search bar and index, Landscape mode support

**Features:** macOS Compatibility

**In-app purchases:** none


### GT Graph

[App page](https://appshunter.io/ios/app/gt-graph/id6757393417)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GT Graph In-App Purchase | $0.99 | one-time |


## Frequently asked questions

### Is OpenGL ES Reference free?

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

### Is GT Graph free?

GT Graph is free to download, with in-app purchases available.

### Do OpenGL ES Reference or GT Graph have ads?

Neither OpenGL ES Reference nor GT Graph shows ads.

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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.*