Libyx

Drop in an EPUB or PDF, pick a language, get a finished EPUB back. Libyx runs on your own machine with your own API key — no account, no upload, no subscription. What's different: a glossary pass reads the whole book first, so names, invented terms and the author's voice stay consistent to the last chapter. A cheap model scores every chapter, and only the weak ones go to an expensive one for polish. Batch mode halves the cost. 57 languages, Mac and Windows.