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developer toolsWebKit/WebKit
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WebKit is the engine that powers how web pages are displayed in Apple's Safari browser, Mail app, and thousands of other applications on iPhone, Mac, and beyond — essentially, it's the core software that reads website code and turns it into what you see on screen. It's an open-source project maintained primarily by Apple but used across multiple platforms including Linux.
why it matters: Any product built as a web app or that embeds a browser view on Apple devices is ultimately running on WebKit, making it a critical dependency for billions of users — understanding its capabilities and limitations directly shapes what features builders can ship on iOS and macOS. For founders and PMs, WebKit's evolution (such as support for new web standards) determines what's technically possible without requiring a native app, which has major implications for development costs and go-to-market strategy.