1. 1. Key Difference: Programming Language GPU.js is a JavaScript library that allows for general-purpose computations on the GPU using JavaScript. It leverages the power of WebGL, a JavaScript API for rendering 3D graphics within a web browser, to perform calculations on the GPU. On the other hand, OpenGL is a low-level graphics programming library that provides a set of functions for rendering 2D and 3D graphics. It is written in C and can be used with different programming languages such as C++, Python, and Java.

2. 2. Key Difference: Platform Support GPU.js is specifically designed to run computations on GPUs within web browsers. It can be used on multiple platforms, including Windows, macOS, Linux, and even mobile devices with WebGL support. On the contrary, OpenGL is a cross-platform library that can be used on various operating systems such as Windows, macOS, Linux, iOS, and Android. It provides a unified API for graphics programming across different platforms.

3. 3. Key Difference: Performance GPU.js leverages the parallel processing capabilities of the GPU to accelerate computations and improve performance. It can execute multiple tasks simultaneously, resulting in faster execution times for certain types of calculations. In contrast, OpenGL can also take advantage of hardware acceleration through the GPU but is primarily focused on graphics rendering rather than general-purpose computations. It provides high-performance graphics rendering capabilities optimized for different platforms.

4. 4. Key Difference: Abstraction Level GPU.js provides a higher level of abstraction compared to OpenGL. It allows developers to write GPU-accelerated code using JavaScript, which is a higher-level language compared to C. This makes it more accessible to developers with experience in web development and JavaScript. On the other hand, OpenGL provides a lower-level API that requires developers to have a deeper understanding of computer graphics and low-level programming concepts.

5. 5. Key Difference: Integration with Web Technologies GPU.js is specifically designed to integrate seamlessly with web technologies such as HTML, CSS, and JavaScript. It can be easily embedded within web pages or used in web applications. It also has built-in support for data visualization and interactivity, making it well-suited for web-based projects. In contrast, while OpenGL can also be used in web applications through technologies like WebGL, it is not inherently designed for web development and may require additional integration steps.

6. 6. Key Difference: Ease of Setup GPU.js is relatively easy to set up and use since it is based on JavaScript, a widely-used programming language in web development. It does not require complex installation procedures or additional dependencies. On the other hand, setting up and using OpenGL can be more involved, especially for beginners, as it typically requires setting up a development environment, compiling code, and managing dependencies depending on the programming language used.

In summary, GPU.js is a JavaScript library that leverages WebGL to perform general-purpose computations on the GPU within web browsers, while OpenGL is a low-level graphics programming library primarily focused on rendering 2D and 3D graphics. The key differences include the programming language used, platform support, performance characteristics, abstraction level, integration with web technologies, and ease of setup.