StoryCodexGive Every Book a Voice: The Complete Guide to Neural Narration
Piper, Kokoro, and Supertonic: how StoryCodex's three neural text to speech engines compare, which to pick, and how to listen offline in 31 languages.
StoryCodex ships with three neural text to speech engines, and they are one of the reasons people stay: Piper, Kokoro, and Supertonic. Each is a different voice family with its own strengths, and you can switch engines per book, per chapter, or whenever the mood changes. All of them run on device after a one-time voice download, with no streaming and no subscription.
The three engines
Piper
Ten English voices (Aria, Elara, Nadir, Victor, Lyria, Dorian, Felix, Milo, Leon, Elise). Light, fast, and great for long listening sessions, with natural prosody pauses at scene breaks.
Kokoro
Thirteen voices (Maple, Sol, Vale, Lunar, Nova, River, Mist, Orion, Ash, Slate, Ridge, Jade, Onyx) in English and Chinese. Warmer and more expressive, the pick when tone matters.
Supertonic
Ten voices (Mira, Selene, Clara, Aurora, Vivian, Rowan, Elias, Magnus, Adrian, Lucian) across 31 languages, from Japanese and Korean to Arabic and Russian, with auto-detect.
Choosing an engine
| Engine | Voices | Languages | Best for |
|---|---|---|---|
| Piper | 10, English | English | Long sessions, fast reading |
| Kokoro | 13 | English, Chinese | Expressive narration |
| Supertonic | 10 | 31, with auto-detect | Multilingual libraries |
Which one should you pick?
- Reading English web novels daily? Start with Piper and switch if you want more character.
- Reading translated fiction where mood matters? Kokoro voices carry tone better.
- Library has several languages? Supertonic auto-detects the language of each chapter.
- Not sure? The onboarding voice offer plays a sample of a bundled demo narration, so you can judge before downloading anything.
The listening experience
Open the player and the full toolkit is there: playback speed, a sleep timer (off, end of chapter, or N minutes), auto-next-chapter, and voice switching on the fly. A compact player bar follows you through the app, and the full-screen Now Reading view works with lock screen controls.
The detail readers love most is sentence highlighting. As the narration speaks, the current sentence lights up in the text, so you can follow along and drop back in at any moment. Pause mid-chapter, tap a word, and the voice continues from exactly where you tapped.
First-time voice setup
- 1
Download a voice
Pick an engine and voice in the reader or settings. Downloads happen over Wi-Fi by default, with a mobile data confirmation if you prefer to download on the go.
- 2
Press play
Start narration from the player bar or the full-screen player. Voices work immediately, offline, forever.
- 3
Swap any time
Change voice, engine, or speed mid-chapter without losing your place.
Keep the story clear
Try StoryCodex for free.
Read, listen, and remember any long story with a private spoiler-safe story memory that lives on your device.