Features
Every character, in their own voice.
Full-cast audiobooks — the ones that used to cost a studio and a budget — running on hardware you already own.
A full cast.
One narrator can't be everyone. The apprentice sounds thirteen; the swordsmith sounds seventy and a forge. Castwright reads your manuscript, detects every speaking character automatically, and assigns each a distinct voice — no manual tagging required.
Dozens of voice designs ship out of the box, and you can design an expressive, emotion-aware voice for every character in one pass — not just the leads — then swap, refine, or replace any of them in seconds before generation begins.
Emotion that stays in character.
When a character gets angry, drops to a whisper, or softens with sadness, the feeling is performed by their own voice — not a stand-in that wandered off-character. Castwright reads the delivery from the page as it analyses your book, and you can hand any single line its own stage direction when you know exactly how it should land.
And when you want a book at its very best, a Higher quality setting performs it on a larger, more expressive model — choose it for a single character, or pin the whole cast in one tap — while your everyday voices stay quick.
A quality gate you can see.
Every finished book now carries a receipt: how many lines were checked for a clean recording, how many were verified word for word against what was actually said, how many characters were checked against their own voice, and what's changed in your cast since you rendered.
It's there on the Listen screen the moment a book is done, and updates live while one is still generating. Download it as plain text or JSON. And if a check hasn't run yet, it says so plainly — Castwright never shows you a clean pass it didn't earn.
That honesty starts earlier, too. As it reads your book and works out who's speaking, it now corrects the speaker mix-ups the text itself proves wrong — before you ever see them — and reports a confidence it can stand behind, not an inflated one, so the lines worth a second look actually surface.
Seven languages, one machine.
English, Russian, Spanish, French, German, Chinese and Japanese. Castwright recognises a manuscript's language the moment you import it, reads it in its own tongue, and gives every character a voice that speaks it — the cast's descriptions kept in the book's own language too.
Chinese and Japanese are the newest, and they arrive whole: rostered, attributed, cast and performed through the same pipeline as every other language.
The reading stays at home.
Working out who speaks each line is the one step that ever had a reason to leave your machine. Now it doesn't have to: Castwright reads your book with a local model by default.
There's still a cloud reader if you want one — it's quicker on a thin machine, and the free tier is enough for a novel. If you've set a cloud key, it steps in when the local model isn't running; one setting stops it doing that, for good.
Series-consistent.
Book two should sound like book one. Castwright remembers your cast — even when an author renames someone mid-series. The cross-book voice library links characters by identity, not just name, so a returning favourite carries the same voice across every instalment.
Open a sequel and Castwright will surface every prior voice assignment, flag newcomers, and let you approve the full cast in one screen before a single syllable is rendered. And once a cast has carried through book after book, lift a card worth sharing — one that leads with the number of voices you've designed and names every character who's come along.
Your own voice. In development
Read a bedtime story in your own voice, even when you're away — or let your kid be the hero. Voice cloning is in development for the next release: your voices, with your permission, will stay on your machine — nothing uploaded, the cloning model running locally alongside the synthesis engine.
Family voices, character personas, and custom designs will live in your private library and travel with your books — not with a vendor's server.
Yours to keep.
Rendered once, on hardware you own. No meter, no monthly fee, no server that can take your library away. Every chapter is written to disk as a standard audio file the moment it finishes — export to MP3, share a clip, or sideload to any player you like.
Castwright is free — and if it shut down tomorrow, your audiobooks wouldn't disappear.
Every line, captioned.
Any finished book exports captions alongside the audio — SRT or VTT, at line, sentence, or word level, for the whole book or a single chapter. Drop a chapter into a video and the words track the voice; or read along on the page while you listen.
Line and sentence captions are read straight from your book's own alignment — nothing re-recorded. Word-level timing calls on the local Whisper model for the fine grain a demo clip wants. Either way the file lands on your drive, yours to share.
On every screen in the house.
Castwright runs on your own machine — and its screen goes wherever you are. Open it from the sofa on a tablet, or from the kitchen on a phone: same library, same cast, same place in the book, over your own Wi-Fi.
No cloud in the middle — your own network is the only wire. For listening away from home, that's what the companion app is for.
Your book, out the door.
The companion app pairs your phone to Castwright with one QR code. Your library — covers, chapters, the lot — syncs over your own Wi-Fi; nothing touches a cloud. Download a book and it plays offline: chapter marks, playback speed, auto-advance, and your listening place kept in sync.
On a tablet or a foldable it opens into two panes — your library down one side, the player down the other — and keeps playing straight through a book switch or a turn of the screen.
At home, a chapter you haven't downloaded starts the moment you tap it, straight off your own machine over your own network, with no certificate to install. Away from the house, it says so and downloads first.
And you can try the whole app before you pair anything to it — a sample library, no server, no network at all. iOS and Android, shipping at launch as part of the Cast Pass.
