Building a Deterministic Batch Icon Pack Generator for Multi-Platform Apps

If you ship apps across Windows, Android, or Apple platforms, you’ve probably dealt with icon packaging friction. Designing the icon isn’t the problem. Packaging it correctly across platforms is. Each platform expects different formats and size matrices: Windows requires .ico containers with multiple embedded sizes Android uses density-based folders Apple has strict size requirements General exports require multiple PNG resolutions Even when the design is finished, you still need to: Export multiple resolutions Generate ICO files Organize folder structures Double-check required sizes Repeat the entire process for the next project For one app, it’s manageable. For multiple apps or client work, it becomes repetitive overhead. The Goal: Deterministic Output I built a small Windows utility called Icon Pack Builder to reduce that friction. The goal wasn’t to replace design tools. It was to package existing icon assets cleanly and predictably. Core principles: Deterministic folder structure