Read-aloud EPUBs with synced narration that meet accessibility rules
TL;DR Voxleaf turns an Indian publisher's titles into EPUB3 ebooks where narration plays in sync with highlighted text, and checks each file against accessibility standards. Publishers pay per title. It serves two buyers - exporters who must meet the EU's accessibility law, and anyone who wants their books readable by India's print-disabled readers.
Census 2011 counted 2.68 crore disabled people in India, and 19% of them had a disability in seeing[1], roughly 50 lakh people. India's main accessible library, Sugamya Pustakalaya, had 27,820 members in 2019, which its own backers called a fraction of those who need it[2].
Its catalogue leaned on foreign titles too. About 15,700 books came from Indian libraries, against 400,000+ searchable from a US accessible-books service[2].
New Indian books, especially in Indian languages, mostly reach blind and low-vision readers late or never. Non-profits convert them one by one after publication, and the publisher earns nothing from it.
What it does, in regulatory terms: licensed format conversion for rights-holders. Voxleaf works only on titles where the publisher holds the rights and commissions the file. It does not rely on the Copyright Act's disability exception, which covers non-profit copies only[3].
The seed pitched multimedia tools for authors to make ebooks interactive. I narrowed it to the one add-on with a paying reason behind it - narration synced to the text, built to the W3C's EPUB 3.3 and EPUB Accessibility specifications[4][5]. Quizzes and video add cost and rarely sell more books.
A publisher uploads a print-ready file. Voxleaf rebuilds it as a structured EPUB with headings, image descriptions and reading order, and then aligns a human or synthetic narration to each sentence. A reviewer fixes alt text and pronunciation, especially for names and Indian-language words.
The publisher gets the EPUB, a separate audiobook file and a conformance report. The same file can go to retailers abroad and to Indian accessible libraries.
Publishers pay per title, priced by length and narration type. My assumption to test is ₹15,000–60,000 a title for synthetic voice with human review, more for studio narration. Buyers are small and mid-size Indian publishers selling ebooks into Europe, and educational publishers who want a compliance story for schools. No Indian vendor publishes per-title prices, so validate this early.
The European Accessibility Act lists e-books in its scope[6], and its rules apply to products and services placed on the EU market from 28 June 2025[7]. Indian publishers who sell ebooks in Europe need accessible files, and the big conversion houses price for big clients. Synthetic voices in Indian languages have also become cheap enough to make narration affordable for a backlist.
No public figure exists for spending on accessible ebook conversion in India. The demand anchors are indirect - about 50 lakh people with a disability in seeing[1] and a national accessible library still small after three years[2].
Adjacent - one ebook platform vendor says it serves 6M+ active users in 25+ countries[8], which shows publishers do pay for EPUB3 tooling.
One ebook platform converts print and PDF files to EPUB3 and claims accessibility by default, with read-aloud for school publishers[8]. A Chennai-based publishing services firm lists accessibility and audiobook services[9]. Both serve large publishers on custom quotes.
The gap is a priced, per-title service for small Indian and Indian-language publishers that delivers synced narration and a conformance report together.
| Difficulty | Moderate (40/100) |
| Starting capital | ₹60 L–1.1 Cr |
| Time to launch | 6–9 months |
Aligning audio to text is a solved problem in English and patchy in Indian scripts. The harder work is quality, which means good image descriptions, correct reading order in complex textbooks and getting names pronounced right. Sales are slow because small publishers buy only when a retailer or buyer forces the issue.
No operating licence, but copyright decides what you're allowed to convert.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't trust AI to get alt text or pronunciation right on its own. A wrong image description misleads a blind reader, so every file needs a human review before it ships.
Want to work out the AI layer for Voxleaf? Talk to Yash →
Here's what can go south -
I see a sensible services-plus-software business for a founder from ebook production or accessibility work. If you want to sell a self-serve tool to authors then look elsewhere, since individual authors rarely pay for this. Prove first that five exporting publishers will pay ₹15,000 or more for one converted title each.
Plan for roughly ₹60 L–1.1 Cr, mostly on the conversion pipeline, human reviewers and narration for the first publisher titles.
You need the publisher's licence for each title. The Copyright Act's accessible-format exception covers non-profit copies only.
Yes, and the European Accessibility Act already pushes EU publishers to buy this. Check local copyright exceptions and accessibility law first.
The free Voxleaf validation kit has the line-by-line capital breakdown, the effort scoring, the copyright and accessibility checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for publishers, and 5 assumptions to test. Download the kit →
Thinking about building Voxleaf or something close to it? The make-or-break work is getting Indian-language narration and image descriptions good enough that publishers stop checking every page, and I can help you plan how to prove that. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.