We have developed an iOS app using three fonts: PingFangSC Regular, PingFangSC Medium, and DINAlternate-Bold. Do all three fonts require commercial authorization to be used in the app?
Do I need authorization to use the font DINAlternate-Bold to develop an Apple app?
If you're using a font in your app that is already installed on the system, you don't need any specific authorization to use them. As long as you use approved Apple APIs, like UIFont and NSFont to select them. However, you can't download Apple's installed fonts and embed them in your app bundle for distribution.