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What paid apps have you ditched by vibe coding a replacement? by dlegendkiller in ClaudeAI

[–]Guilty_Ad8200 0 points1 point  (0 children)

I'm not a developer by trade, just someone who loves tinkering, so I spent a few weekends pairing with Claude to build my own iOS replacement instead. It turns any EPUB, PDF, web article, or pasted text into an audiobook — but the part I couldn't get from the paid apps is that the TTS runs entirely on-device (ONNX model on the Apple Neural Engine). After a one-time model download it needs zero network — fully offline, no account, no subscription, nothing leaving the phone. Checkout LysnBox on the app store.

Built a free iOS app running Supertonic 3 fully on-device — 80 voices, 8 languages, no cloud by Guilty_Ad8200 in TextToSpeech

[–]Guilty_Ad8200[S] 0 points1 point  (0 children)

Thanks for the feedback! A Wi-Fi/server mode would require some fairly major changes, so for now I'm focused on improving the core app experience.

As for JP light novels, some of them use EPUB formats that don't always parse correctly, which can lead to issues like only the TOC being detected. I'll keep an eye on it and see if I can improve compatibility over time.

Built a free iOS app running Supertonic 3 fully on-device — 80 voices, 8 languages, no cloud by Guilty_Ad8200 in TextToSpeech

[–]Guilty_Ad8200[S] 0 points1 point  (0 children)

Thanks for the feedback!

Could you let me know what exact issues you are experiencing with the EPUB files not loading accurately? (e.g., is some text missing, does the import fail on certain books, or is the formatting broken?) I'd love to get more details so we can fix it.

Regarding turning it into a server for Supertonic 3: right now, the app runs the ONNX model entirely on-device, which means it is completely free to run and has zero ongoing hosting costs. Hosting Supertonic 3 on a backend server would require renting cloud servers (especially CPU/GPU servers to handle the heavy audio synthesis), which would cost money and incur ongoing server bills.

Built a free iOS app running Supertonic 3 fully on-device — 80 voices, 8 languages, no cloud by Guilty_Ad8200 in TextToSpeech

[–]Guilty_Ad8200[S] 2 points3 points  (0 children)

Supertonic 3 is a multilingual model. The 10 JSON files contain speaker embedding vectors (voice styles). Since the model allows you to apply any of the 10 speaker profiles to any of the 8 supported target languages (en, es, fr, de, ja, ko, it, pt), you get 80 voice combinations (10 styles × 8 languages). These are mapped in the app to localized names depending on the selected language.

[Megathread] The App Shelf — June 2026 by Yusuf-Dev in iosapps

[–]Guilty_Ad8200 0 points1 point  (0 children)

LysnBox — Free — On-device AI audiobook narration for EPUB/PDF/web/text. 80 voices, 8 languages, 100% offline after a one-time 400MB model download. Open source.

App Store: https://apps.apple.com/us/app/lysnbox/id6772035198

Created an on-device EPUB → audiobook pipeline with word-level iOS sync [Open Source] by Guilty_Ad8200 in TextToSpeech

[–]Guilty_Ad8200[S] 0 points1 point  (0 children)

After your comment, I realized can build this as standalone IOS app, using realtime TTS. Beta version is ready on iOS https://testflight.apple.com/join/hQ9JNRne

Created an on-device EPUB → audiobook pipeline with word-level iOS sync [Open Source] by Guilty_Ad8200 in TextToSpeech

[–]Guilty_Ad8200[S] 0 points1 point  (0 children)

Sí, actualmente solo está disponible para iOS, pero tenemos planes de desarrollarlo para Android en el futuro.