STL (Stereolithography) files are commonly used for 3D printing and modeling. When it comes to viewing these files, there are several options available across different platforms.

Viewing STL files on a computer:

1. Windows: There are various software options available for viewing STL files on Windows, such as FreeCAD, MeshLab, and 3D Builder. These programs allow you to open and manipulate STL files easily.

2. Mac: On Mac, you can use software like Blender, MeshMixer, or OpenSCAD to view and modify STL files. These programs offer a range of tools for working with 3D models.

3. Linux: Linux users can utilize tools like MeshLab, FreeCAD, or OpenSCAD to view and edit STL files. These open-source programs provide comprehensive features for 3D manipulation.

Viewing STL files on a mobile device:

1. iOS: If you're using an iPhone or iPad, there are apps like 3D Viewer for iPhone and STL Viewer that allow you to view STL files on the go. These apps provide a user-friendly interface for exploring 3D models.

2. Android: For Android devices, apps like GOM Inspect, MeshLab, or 3D Viewer for Android offer the ability to view and inspect STL files. These apps support various 3D model formats and can display STL files with ease.

Web-based STL viewers:

In addition to desktop and mobile options, there are web-based platforms for viewing STL files. Websites like ViewSTL.com and Clari3D Viewer allow you to upload and view STL files directly in your web browser. These online viewers are convenient for quick access to 3D models without the need for installing additional software.

In conclusion, there are multiple ways to view STL files across different platforms and devices. Whether you're using a computer, phone, or tablet, there are plenty of options available to open and manipulate STL files. With the variety of software, apps, and web-based viewers on the market, it's easy to find a solution that suits your needs for viewing 3D models in STL format.