Transitional serifs live in a useful middle ground: moderate stroke contrast, bracketed serifs, an upright axis, and none of the fussiness that makes a face hard to read at text sizes. Literata Book sits in that tradition, a serif published by Google and built by the TypeTogether foundry. The main file is the Regular, and eight family files ship together, so you get a spread of weights and styles rather than a single cut.

What makes it handy is the double duty flagged in its tags: drawn for paragraphs, but steady enough to work as display type in headings. Long-form article body text in a reading app, chapter openers for a self-published paperback interior, editorial pull quotes set large against a narrow column, section headings on a documentation or research site: all of that is within range. Coverage runs to 364 or more Latin-based languages, which matters if you are setting the same layout in Polish, Vietnamese, and Turkish and would rather not swap families halfway through a project.

For pairing, put a quiet grotesque sans beside it for captions, UI labels, and footnotes, ideally something with a plain single-storey feel in the small sizes so it stays out of the way. The serif carries the voice; the sans just labels things. Literata Book is free under the Open Font License for personal and commercial work, and the files download directly from this page.