ACX vs INaudio vs TomeVox: Which to Choose?

ACX is a human-only marketplace tied to Audible, paying 50% exclusive or 30% non-exclusive. INaudio is a wide aggregator but rejects external AI files. TomeVox makes the finished AI file for a flat $49–$99, then you distribute it via Google Play Books and Kobo (direct), an AI-friendly aggregator for Apple Books and Spotify, and Author's Republic for Chirp.

The confusion between ACX, INaudio, and TomeVox comes from treating all three as the same kind of service, when they sit at different stages of audiobook publishing. ACX (Audible Creation Exchange) is a marketplace that connects authors with human narrators and then sells the result through Audible. INaudio (formerly Findaway Voices) is a distribution aggregator that pushes a finished audiobook to many retailers and library systems at once. TomeVox is a production service that turns your manuscript into a finished audio file. Choosing well means first deciding which stage you actually need help with.

This comparison stays deliberately even-handed because the three services solve different problems. One author hires a human narrator through ACX and distributes exclusively on Audible. Another pays TomeVox to produce an AI-narrated file and then takes it wide — but because that file is externally produced AI, the route is direct uploads to Google Play Books and Kobo, an AI-friendly aggregator (PublishDrive or Author's Republic) for Apple Books and Spotify, and Author's Republic for Chirp, rather than INaudio. The table and decision guide below describe what each option does, what it costs, and who it suits — without pretending any single choice is right for everyone.

What is the difference between ACX, INaudio, and TomeVox?

ACX is a two-sided marketplace where authors find professional human narrators, agree on either a flat per-finished-hour fee or a royalty-share arrangement, and publish the completed audiobook on Audible, Amazon, and Apple. ACX handles narration, distribution to Audible's ecosystem, and royalty payments. Crucially, standard ACX submission requires human narration — its audio submission requirements state a title must be narrated by a human unless otherwise authorized (ACX audio submission requirements). Audible has announced it will accept third-party AI-narrated audio, but as of 2026 that is not yet open self-service to all indie authors.

INaudio is a distribution aggregator, not a production tool. INaudio takes a finished audiobook file you supply and distributes it to Apple Books, Spotify, Kobo, Google Play, Chirp, and a large network of libraries through OverDrive, Hoopla, and similar systems. But its AI policy is narrow: INaudio accepts AI narration only when produced via Google Play Books, ElevenLabs, or Spoken Press, and it rejects externally produced AI files — so it is not a route for a standalone AI audiobook made elsewhere. It is non-exclusive and pays a share of net receipts that varies by retail channel. For a full breakdown of the rebrand and the AI policy, see the INaudio (Findaway Voices) indie author guide.

TomeVox is a done-for-you AI production service that creates the audiobook file itself. You upload a manuscript (EPUB, DOCX, PDF, or TXT), choose a voice, and TomeVox returns an M4B file with chapter markers plus per-chapter MP3 files, usually within 48 hours, for a flat early bird fee of $49–$99. TomeVox does not distribute or sell your audiobook — it produces a file you own outright, with full commercial distribution rights and no exclusivity. Because that file is externally produced AI, you distribute it by uploading directly to Google Play Books and Kobo, going wide to Apple Books and Spotify through an AI-friendly aggregator (PublishDrive or Author's Republic), and reaching Chirp via Author's Republic — and you can sell direct from your own site, too.

ACX vs INaudio vs TomeVox: full comparison table

The table below compares ACX, INaudio, and TomeVox across the factors indie authors weigh most: what each one actually does, narration type, cost, royalties, exclusivity, distribution reach, and turnaround. Read it as three different roles rather than three competing products.

The key takeaway from the table is that TomeVox produces the file and the distribution layer is separate — but for an externally produced AI file that layer is Google Play Books and Kobo (direct), an AI-friendly aggregator for Apple Books and Spotify, and Author's Republic for Chirp, not INaudio or standard ACX. ACX, by contrast, bundles human narration and Audible distribution into a single (often exclusive) package. For a deeper look at the human-versus-AI narration trade-off specifically, see ACX vs AI audiobook production and AI vs human narrator: which to choose.

How do ACX royalties and exclusivity work?

ACX pays a 50% royalty when you grant Audible exclusive distribution rights, meaning the audiobook is sold only through Audible, Amazon, and iTunes for the duration of the agreement, typically seven years. If you choose non-exclusive distribution so you can sell the same title elsewhere, ACX's royalty drops to 30%. This exclusive-versus-wide decision is the single biggest financial choice on ACX. (ACX moved to this new royalty model in May 2026; the legacy 40%/25% rates are being retired at the end of 2026 — see the ACX royalty schedule.)

ACX also offers a royalty-share option for authors who do not want to pay a narrator upfront. Under royalty share, a narrator produces your audiobook for no upfront fee and instead receives 50% of your royalties for seven years. Royalty share lowers the barrier to entry but permanently splits your earnings on that title, so it suits authors who cannot fund production but are confident the book will sell. The math behind that trade-off is covered in the ACX comparison guide.

What does INaudio distribution cover?

INaudio distributes a finished audiobook to a wide retail and library network from a single upload, which is its main advantage over uploading to each store separately. INaudio reaches Apple Books, Spotify, Kobo, Google Play, Chirp (BookBub's audiobook deals platform), and library systems including OverDrive and Hoopla, all on a non-exclusive basis. There is one major catch for AI titles, though: INaudio accepts AI narration only when it was produced via Google Play Books, ElevenLabs, or Spoken Press, and it rejects externally produced AI files — so a standalone AI audiobook (such as a TomeVox file) is not eligible for INaudio at all.

INaudio does not produce audio, so you must bring a finished, spec-compliant file before you can distribute through it. Its revenue model is wholesale: you set a suggested retail price and earn a share of the net receipts each channel reports, with the exact percentage varying by retailer. For an externally produced AI file, the practical wide-distribution route is different: upload directly to Google Play Books and Kobo, go wide to Apple Books and Spotify through an AI-friendly aggregator (PublishDrive or Author's Republic), and reach Chirp via Author's Republic. For authors deciding where a finished file should go, the guide to where to sell an AI audiobook compares these channels.

Where does TomeVox fit in the workflow?

TomeVox fits at the production stage, before distribution. TomeVox converts your manuscript into a finished audiobook for a flat early bird fee — $49 up to 60,000 words, $79 up to 100,000 words, and $99 up to 150,000 words — and delivers an M4B file with chapter markers plus per-chapter MP3 files, usually within 48 hours. Every audiobook is automatically checked for technical quality before delivery, and you can re-generate any chapter at no extra cost if a pronunciation or pacing change is needed.

TomeVox gives you full commercial distribution rights and no exclusivity, so the finished file is yours to take anywhere disclosure-permitting. Because it is externally produced AI, that means direct uploads to Google Play Books and Kobo, an AI-friendly aggregator (PublishDrive or Author's Republic) for Apple Books and Spotify, Author's Republic for Chirp, and direct sales from your own site via Payhip, Gumroad, or BookFunnel — disclosing the digital-voice narration on every channel. It is not a fit for INaudio or standard ACX. TomeVox offers a free first-chapter preview with no credit card so you can hear the voice before paying, and supports 13 languages with American and British English voices in Classic and Playful styles. Author voice cloning is on the TomeVox roadmap as a coming-soon feature, not a current capability. For the full step-by-step process, see the AI audiobook production guide.

Which should you choose?

Choose ACX if you want professional human narration, plan to sell primarily through Audible, and are comfortable with either paying a narrator upfront or sharing 50% of royalties for seven years under royalty share. ACX is the established route for authors who prioritise the Audible marketplace and human performance over speed, cost, and distribution flexibility.

Choose INaudio if you already have a qualifying finished audiobook file — human-narrated, or AI produced via Google Play Books, ElevenLabs, or Spoken Press — and want the widest possible distribution from a single upload across Apple, Spotify, Kobo, Chirp, and libraries without granting exclusivity. Note that INaudio will not take an externally produced AI file, so it is not an option for a standalone AI audiobook made elsewhere.

Choose TomeVox if you need the audiobook produced quickly and affordably with AI narration, want to keep full rights with no narrator royalty split (you keep your full share of each sale, minus only the retailer's standard cut), and intend to distribute the result yourself. Since a TomeVox file is externally produced AI, the wide route is direct uploads to Google Play Books and Kobo, an AI-friendly aggregator for Apple Books and Spotify, and Author's Republic for Chirp — plus direct sales. For a cost and channel comparison across routes, see how much it costs to make and sell an AI audiobook.