For authors
AI audiobook narration that survives a real listen
The gap between text-to-speech and a publishable audiobook is production: casting, consistency, score, and QA. Lex closes that gap for a one-time fee starting at $49 — and proves it with your own first chapter, free, in 24 hours.
Why raw text-to-speech is not an audiobook
Feed a novel into a TTS API and you get audio that sounds fine for thirty seconds and falls apart over a chapter. The models are stateless — every few thousand characters is a fresh take, and the narrator’s pitch and energy drift between takes. Listeners hear it as the voice “changing” mid-paragraph. Names get pronounced three different ways. Dialogue and narration blur into the same voice at the same energy.
These are production problems, and they have production solutions — the same ones recording studios have used for decades, adapted to AI: measure everything, take multiple takes, splice surgically, master consistently. That pipeline is the product. We wrote up the engineering in detail.
What production-grade means here
Casting
Voices are auditioned against your actual text, not picked from a dropdown. Multi-voice casting gives each character a distinct, consistent voice for the whole book.
Consistency engineering
TTS models drift between takes. Every chunk join is measured for pitch and level continuity, rendered in multiple takes, and the most continuous take wins. Failed joins are surgically re-rendered.
Score and sound design
Music beds, ambience, and sound effects are cued to the story — sparingly, the way a film mixes them — then mastered so narration always stays intelligible.
Human QA
A person listens before you do. Pronunciation, pacing, seams, and mix all get a pass, and you approve the final audio before anything ships.
Disclosure and distribution
AI-narration disclosure is handled per store. The Publisher package delivers to Spotify, Apple Books, Google Play, Kobo, libraries, and the Lex Premium catalog — non-exclusive, 100% of royalties yours.
Pricing
Voiceover
$49 once
10 hours of finished narration — multi-voice casting, commercial license, 320kbps downloads
Studio
$99 once
10 hours fully scored — music beds, ambience, and SFX mixed in
Publisher
Custom once
Everything in Studio, plus multiple voices per book, and we publish it everywhere — Google Play, Kobo, Spotify, Apple Books, and libraries, disclosure handled. Optional Lex Premium catalog listing if you want it. 100% of royalties, zero exclusivity.
One-time purchase, 10 finished hours per package, extra hours $5–10. See how this compares to traditional production in our full cost breakdown or against ACX specifically.
Frequently asked questions
Is AI audiobook narration good enough to publish?
Raw text-to-speech is not. Production-grade AI narration — with deliberate voice casting, consistency engineering across chapter boundaries, human QA passes, mastering, and a musical score — is being published today on Spotify, Apple Books, Google Play, Kobo, and library platforms. The difference is the production pipeline, not the underlying voice model.
Which stores accept AI-narrated audiobooks?
Spotify, Apple Books, Google Play Books, Kobo, and major library platforms (Hoopla, OverDrive/Libby via aggregators) accept AI-narrated audiobooks with proper disclosure. Audible/ACX does not accept AI narration through its marketplace as of 2026. Lex handles the disclosure requirements per store as part of its Publisher package.
Why do AI narrators change voice mid-chapter, and how is it fixed?
Text-to-speech models are stateless: every request is an independent take, so pitch and energy drift between chunks — audible as a seam where the narrator suddenly sounds different. Lex measures every join (speech level and median pitch on each side), renders multiple takes scored for continuity, matches levels, fills joins with room tone, and re-renders any join that fails QA. Every chapter ships with an objective seam report.
Can my audiobook have multiple character voices?
Yes. Lex casts each speaking character with a distinct voice, keeps a consistent cast across the whole book, and mixes dialogue against the narrator so conversations read like a performance rather than one voice doing accents.
How much does AI audiobook narration cost?
Lex packages are one-time purchases covering 10 finished hours: Voiceover at $49 (narration only), Studio at $99 (fully scored with music, ambience, and SFX), and Publisher at $199 (scored plus multi-voice casting and distribution everywhere with 100% royalties). Extra hours run $5–10.
Judge it with your own book
Send your first chapter. Finished, fully-produced audio in your inbox within 24 hours. Free, no card.
Start with chapter one