Free, every book, the full cast — yours to keep.
Every character. Their own voice. Every book in the series.
Any book, performed by a full cast — kept true, kept yours, book after book. It runs on a machine you may already own — a gaming PC or laptop with a 6 GB graphics card, or any Apple Silicon Mac — and your book never leaves the house.
No account, no upload, no catch. The source is on GitHub for you to read; the voices are Kokoro, Coqui XTTS and Qwen3-TTS; the whole performance runs on your own machine.
If you can game on it, you can cast on it.
The work falls on a graphics card you may already own — 6 GB gets you started and 8 GB is the sweet spot, the kind in a mid-range gaming laptop, or any Apple Silicon Mac. No GPU? It still runs on the processor alone — slower, and we'll say so plainly rather than pretend otherwise. Check what you need →
Listen first
One narrator, or a whole cast.
Hear it — The forge, and the dragon at the door
The Coalfall Commission
Now playing: Full cast — every character in their own voice
The cast you’ll hear
- Wren · “Sparrow”Girl, 13 — bright, quick
- Master OduvanMan, 70 — gravel and patience
- MaerinWoman, 40s — clipped, brisk
- CoalfallThe dragon — low, slow, ancient
- NarratorWarm, measured, unhurried
Same passage, two ways. One narrator, then every character in their own voice.
Five languages to hear here. Chinese and Japanese are performed too — those clips are still in the studio.
How it works
From a book to a performance.
- 1
Drop in a book — EPUB, PDF, or paste a chapter.
- 2
It finds the cast — every character, detected and attributed.
- 3
Give them voices — assign or design a distinct voice each.
- 4
Hear the performance — a full-cast audiobook, yours to keep.
The app
A finished tool, not a script.
Listen — chapter by chapter, full cast or narrator
Cast — every character, voice assigned and previewed
Generate — watch each line render in real time
Library — your series, organised and always playable
Four reasons it sounds right.
A full cast
One narrator can't be everyone. The apprentice sounds thirteen; the swordsmith sounds seventy and a forge.
No one else does this
Series-consistent
Book two should sound like book one. Castwright remembers your cast — even when an author renames someone mid-series.
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. Your voices, with your permission, will stay on your machine. Coming soon.
Yours to keep
Rendered once, on hardware you own. No meter, no monthly fee, no server that can take your library away. Your book never leaves the house.
What no one else does
A library that remembers.
In The Coalfall Commission, the dragon's apprentice is called Wren by everyone except old Master Oduvan, who knew her when she was small and still calls her Sparrow. Same girl. Two names. One voice.
Castwright resolves that automatically — matching characters across books by identity, not just by what a given chapter happens to call them. And when an author renames a character between books (it happens more than you'd think), Castwright keeps the voice consistent even then.
Without series memory, the same character gets a new voice every time they cross a book boundary. The performance fractures. Castwright keeps it whole.
Full-cast generation isn't unique anymore. Series memory is.
The proof, on your own shelf: how many voices have carried, across how many books.
The whole shelf
Your whole library, in one place.
Every series on one shelf — what's in progress, what's finished, and where you left off in each. Covers, runtimes, and the cast behind every book: all yours, all on your own disk.
The road ahead
What's coming next.
Everything below is on the bench today — some of it lands free for everyone, some joins the Cast Pass.
Your voice, and your family's
Lend the narrator your voice — recorded with consent, kept at home, never uploaded. Your first voice will be free; family voices join the Cast Pass.
More voice engines
Kokoro, Qwen and Coqui aren't the end of it. Two expressive engines are on the bench for bigger cards — IndexTTS-2, tuned for per-line emotion from one designed voice (likely a 12 GB card), and Fish Audio S2-Pro for the 16 GB tier, chasing the finest fidelity. They land as bigger-card support matures.
Three more languages
Castwright performs in English, Russian, Spanish, French, German, Chinese and Japanese today. The Qwen3-TTS engine underneath speaks three more — Korean, Italian and Portuguese — and we're bringing them to the cast, free.
One voice, all the way through
Series memory already gives a returning character the same voice, book after book. Next, the quality gate's ear reaches across the whole series — checking each character still sounds like themselves from the first book to the latest, not just that they were handed the right voice. Whether that same check can reach across languages is a harder, unproven question we're still exploring.
Bring your AI assistant
Tell Claude — or any assistant that speaks MCP — "make me the audiobook", and it drives Castwright end to end: import, cast, generate, deliver to your phone.
Proof, not promises.
Quality
Every line is acoustically checked before a chapter is assembled, and can be verified word for word against what was actually said. The plainly broken ones never reach your ears — and every finished book carries a visible, exportable receipt of exactly what was checked.
Patience
Start it and walk away. Every heavy step — analysis, voice design, generation — runs in a queue that retries the rough patches on its own: a model hiccup or a GPU stumble doesn't sink the job, it picks back up. An activity log tells you exactly what happened while you were gone.
Economics
You pay the electricity, once per book — against ~$11/month clouds that won't let you export, and cloud creation that runs to ~$200 per book by the vendors' own published rates (June 2026).
Permanence
When Play.ht was acquired in 2025, its users' libraries and voice clones were deleted at sunset. Your renders are files on your disk. Nobody can take them away.
Versus the alternatives
Honest about the trade-offs.
- Clouds make stunning voices — they also meter them by the hour and keep your audio.
- Open-source tools are kin; today they cast within a single book, not across a series.
- Audible's human full-cast productions are the benchmark we honour.
Pricing
Free. The library is seven dollars.
Castwright is free — every book, the full cast, yours to keep. At launch, the Cast Pass is seven dollars, once. Free buys you a perfect book; the Cast Pass gives your library a memory.
See what's free →Questions
The honest answers.
Do I need a GPU?
Is my data private?
What does it cost?
What formats can I import and export?
Any book, performed by a full cast — kept true, kept yours, book after book.