Introducing ChindaTTS — Production Thai-English Text-to-Speech, Now Live
Today we are launching ChindaTTS, our production neural Thai + English text-to-speech engine. It speaks natural Thai with correct prosody, reads numbers, dates, money and code-switched text the way a person would, handles long-form narration cleanly, and can clone a voice from a short consented sample — all behind an API that is drop-in compatible with iApp TTS v3.
Hear both voices on the ChindaTTS page, and try every style in the API demo.
Why ChindaTTS
General-purpose TTS has always treated Thai as an afterthought — wrong tones, mangled final consonants, robotic delivery, and a complete inability to mix Thai with English. ChindaTTS was built for Thai from the ground up. The result is speech that sounds like a real Thai speaker, even when the sentence is full of numbers, English loanwords, and brand names.
What it does
- Thai + English + code-switch in one request. The text frontend reads numbers, dates, currency, percentages, phone/ID runs, abbreviations, emails, URLs, ALL-CAPS emphasis, and English tech loanwords naturally.
- Correct central-Thai accent. Pure-English passages automatically switch to a native-English mode, per sentence.
- Long-form, spoken in full — no run-on, no cut-off — up to ~100 seconds per request.
- 2 voices (Kaitom, Kaimook) × 8 speaking styles (neutral, friendly, cheerful, calm, serious, sad, excited, empathetic).
- Voice cloning from ~10–20 seconds of consented audio; stateless — used once, never stored.
- Streaming — first audio in under ~1 second; drop-in iApp v3 endpoint.
Hear it for yourself
These are real, unedited ChindaTTS samples. Every style and live voice cloning can be tried in the API demo.
The main voices
Kaitom (flagship):
Kaimook (female):
Numbers, dates and money — read correctly
Thai + English code-switching
Speaking styles (same engine, different delivery)
Cheerful:
Calm:
Empathetic:
ChindaTTS Prime (optional)
ChindaTTS Prime adds a speech-recognition gate that re-rolls a garbled or cut take — it selects a better take, it does not alter the audio. Same sound; the gain is stability on hard inputs, especially expressive styles.
| Metric — CER (lower is better) | ChindaTTS | ChindaTTS Prime |
|---|---|---|
| Everyday text | 3.2% | 3.2% |
| Numbers / dates / currency | 1.8% | 1.4% |
| Code-switch | 7.9% | 7.6% |
| Expressive styles | 8.3% | 3.9% |
| Bad-take rate (styles) | 15.0% | 6.7% |
| Worst-case p90 (styles) | 31.8% | 11.4% |
Everyday text already sits at the recognizer noise floor; Prime's value shows up on expressive styles, cutting the bad-take rate by more than half.
Speed (per GPU, ~6–7× real-time)
| Request | Audio | Processing |
|---|---|---|
| ~100 chars | ~9 s | ~1.5 s |
| ~300 chars | ~25 s | ~4 s |
| ~1000 chars | ~90 s | ~14 s |
Streaming delivers first audio in under ~1 second, and throughput scales by adding GPUs.
Where it fits
Voice assistants and IVR, in-app and announcement narration, accessibility, e-learning, notifications, and any product that needs a natural Thai voice that also handles English without breaking stride.
Spread the word
Try ChindaTTS
- Listen to the samples: ChindaTTS
- Product page & specs: iapp.co.th/products/chindaTTS
- Talk to us about a pilot: sale@iapp.co.th
ChindaTTS is production-ready for pilots today — voices, cloning, streaming, the iApp v3 API, and Prime are all live and tested. We can't wait to hear what you build with it.