# Watki — Open graphics, compute & XR

> Offline reference for OpenGL ES 3.2 commands and functions. (iPhone/iPad app by Saumya Lahera.)

- Source: https://appshunter.io/ios/app/watki/id1056915836 (this page in markdown: same URL + `.md`)
- Developer: [Saumya Lahera](https://appshunter.io/developer/921732703)
- Category: Education
- Price: Free
- Rating: 3.00/5 from 3 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 7 MB
- Languages: American English
- Released: 2015-11-16
- Data updated: 2026-11-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/watki/id1056915836/reviews.md

## What is Watki?

Watki is an offline field guide to open graphics, compute and XR standards. Every call, built-in and type, with what it does, what it takes and where it fits, set in a quiet black-and-white reader that works without a connection.

WHAT'S INSIDE
21 volumes and more than 12,000 entries, including:
• Vulkan 1.4 and Vulkan SC 1.0, with extensions
• OpenGL ES 2.0 to 3.2, OpenGL 4.6 core and OpenGL SC 2.0
• EGL 1.5 and WebGL 1.0 and 2.0, with extensions
• OpenCL 3.0 and OpenCL C, SYCL 2020 and SPIR-V 1.6
• OpenXR 1.1, OpenVX 1.3.1, OpenVG 1.1 and ANARI 1.1
• The Slang core module
• glTF 2.0, KTX 2.0, COLLADA 1.5 and NNEF 1.0.5
• Short overviews of machine learning and safety-critical work

HOW IT READS
• Each volume opens to its sections; each section lists its entries in groups you can jump between.
• Entries show the signature, parameters, return values and the version or extension that added them.
• Search across every volume at once.
• Keep the entries you use most and come back to recent ones.
• See how much of each volume you have read.

MADE TO BE LOOKED AT
A slow mist drifts behind the pages and changes with the time of day. You can thicken it, slow it, freeze it or give it a new pattern. In the darkroom you can develop any photo as a 1-bit print and save it.

PRIVATE AND OFFLINE
Everything ships inside the app. No account, no ads, no tracking and no data collected.

SOURCES
The reference text is generated from the published registries, headers and reference pages of each standard, under their licences. Full credits and licence details are in the app.

Watki is an independent reader and is not affiliated with or endorsed by The Khronos Group or any other standards body.

Vulkan, OpenGL ES, OpenGL SC, EGL, WebGL, OpenCL, SYCL, SPIR-V, OpenXR, OpenVX, OpenVG, ANARI, glTF, KTX, COLLADA, NNEF and Khronos are trademarks or registered trademarks of The Khronos Group Inc. OpenGL is a registered trademark of Hewlett Packard Enterprise, used under licence by Khronos. Slang is a trademark of its respective owner. All other names are the property of their owners and are used only to identify the standards described.

## Key features

- 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

## Is Watki safe?

Not enough ratings yet to assess Watki.

## Is Watki legit?

Watki appears to be a legitimate app. The AppsHunter Legitimacy Score for Watki is 83 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/watki/id1056915836/reviews.md

### 4/5 — Simple and Useful

*2022-02-16*

This app is exactly what I was looking for; a simple and easy to use reference for OpenGL ES functions. I have a textbook for OpenGL ES, but this app is much more convenient to pull out for a quick double-check/reminder on how a function behaves (and is easier to use than going online to the official Kronos documentation). Search bar could use some work, but I use the letter scroll bar instead for searching functions.

Also works well on macOS.

I wish there was a similar app available for Vulkan.

### 4/5 — Basic but useful

*2021-03-15*

Not a full function reference but useful. Could use some links to the Khronos source material and other GLSL references, and the search function could be improved, but just fine and valuable as a free app.

### 1/5 — So wish this didn't crash

*2016-05-28*

It's killing me as it was perfect for what I need. :(

## Frequently asked questions about Watki

### What OpenGL ES API version does OpenGL ES Reference cover?

OpenGL ES Reference covers the complete descriptions of all OpenGL ES commands and functions contained in the OpenGL ES 3.2 API and Shading Language Specifications.

### Is OpenGL ES Reference free to use?

Yes, OpenGL ES Reference is free of cost. Its purpose is to provide knowledge about OpenGL ES for free.

### Does OpenGL ES Reference require an internet connection?

No, OpenGL ES Reference does not need an internet connection. All the details are provided offline, making it convenient to access information anywhere.

### How is the information in OpenGL ES Reference organized?

Functions are listed in a very systematic manner. The app also features a search bar and a search index list to make it easier to navigate through the sections and find specific commands.

### Can beginners use OpenGL ES Reference?

Yes, OpenGL ES Reference can be used by beginners to learn the functions. The information is provided from the official Khronos Group website, making it easy to understand.

### What devices is OpenGL ES Reference compatible with?

OpenGL ES Reference is supported on iPhone and iPod devices. It also supports landscape mode for a better viewing experience.

### How often is OpenGL ES Reference updated?

The latest version of OpenGL ES Reference is 1.0, and it was last updated on November 16, 2015. The current release date is also November 16, 2015.

### What is the user sentiment for OpenGL ES Reference?

Based on the available data, OpenGL ES Reference has a rating of 3.0 stars from 3 ratings. This suggests a mixed to slightly negative user reception.

## Version history (last 2 releases)

### 2.0 — 2026-11-06

OpenGL ES Reference is now Watki.

• Rebuilt from scratch with a new black-and-white design.
• Now covers 21 graphics, compute and XR standards with more than 12,000 entries, not only OpenGL ES.
• Search across every volume at once.
• Keep entries and return to recent ones.
• A living background you can tune, freeze or reseed in Settings.
• A darkroom that develops your photos as 1-bit prints.
• Still fully offline, with no tracking and no data collected.

### 1.0 — 2015-11-16

This app has been updated by Apple to display the Apple Watch app icon.

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## More apps by Saumya Lahera

- [Web Codes](https://appshunter.io/ios/app/web-codes/id922003912)

All apps by Saumya Lahera: https://appshunter.io/developer/921732703

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-11.*