The voice in your head, out loud.
Inside Voice reads your EPUBs and PDFs aloud and lights up every word as it lands. Speed read a chapter one word at a time. Then it asks what you just read, so it actually stays. Your books never leave your phone.
What is Inside Voice? Inside Voice is a privacy-first iOS reader for EPUB and PDF files. It reads books aloud with word-level highlighting synced to narration, offers RSVP speed reading at 100 to 1000 words per minute, and uses recall prompts so you summarize a passage before rereading it. All books and reading progress stay on your iPhone unless you opt into optional cloud AI keys.
Free. No account, no ads, no tracking.
How do I add a book?
Add an EPUB or PDF from Files, or share one straight into the app. It is copied into your library, so moving the original never breaks the book. Every book keeps its own place, down to the word.
How does word-level highlighting work?
Pick any voice on your phone and press play. The highlight follows the narration exactly, at 0.75x through 2.0x, and it keeps going with the screen off, with the book on your lock screen.
What is RSVP speed reading?
Speed reading holds a single word in a fixed spot so your eyes stop hunting. 100 to 1000 words a minute, with the sentence underneath when you need the context back.
What is a recall prompt?
A recall card interrupts on purpose. Say or type what happened, and it checks your answer against the passage you already finished. It never reads ahead, so nothing gets spoiled.
Can I ask the book a question?
Lost track of a character? Ask. The answer is built only from the part you have already read. On device by default, so the question stays with you.