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ly1878 #17
Why can’t I use my own installed fonts?
Apple’s WebKit component is used to render content, which does not support user-installed fonts. This is due to privacy concerns, as it would allow apps to fingerprint and track users based on their installed custom fonts (see Tracking Prevention in WebKit).
Yomu includes several optimized reader fonts and you can choose any preinstalled system font. From the preferences you can also select the “original” book font, but this will only work when it’s either a system font or when the corresponding font files are bundled with the book.