ImageAlpha
ImageAlpha is a standalone image processing tool for macOS that specialises in PNG optimisation, particularly the conversion of images to indexed colour with transparency. It reduces file size significantly while preserving image quality, making it useful for web developers, designers and anyone working with web graphics. The app is built around the libimagequant algorithm and strips out unnecessary colour information from PNGs to create smaller, faster-loading files without affecting visual appearance in most cases.
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1 suggestionWe could not find recent information about ImageAlpha's native Apple Silicon status or whether the developer is still maintaining the project. The bundle ID and app name suggest this is a niche image utility, but without current search results we cannot confirm whether a native build exists or is in development. If you rely on ImageAlpha, check the developer's website or GitHub repository directly to ask whether a native Apple Silicon build is planned or available. Given that Apple is removing Rosetta 2 in macOS 28 (September 2028), you should clarify the app's status soon — an Intel-only build will stop launching on that release. As actively maintained alternatives for PNG optimisation with confirmed native Apple Silicon support, consider ImageOptim (free, open source), PNGCrush (command-line tool), or online services like TinyPNG for occasional use.
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