How do I check if a Mac app is Intel-only?

Select the app in Finder and press Command-I. If Kind says "Application (Intel)", it needs Rosetta and stops launching with macOS 28. "Universal" and "Apple silicon" apps are fine. On macOS 27, open System Settings > General > About and click Details next to Intel-based Apps for the full list.

Source: Using Intel-based apps on a Mac with Apple silicon, Apple Support.

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