Kotoba - Voice Translation

Kotoba Technologies

In-app purchases

About this app

"Kotoba" is a real-time voice simultaneous translation app developed by Kotoba Technologies, aiming to deliver the "world's best simultaneous translation experience."

The app is powered by Kotoba's proprietary speech GenAI model called "Koto".
"Koto" can predict text translations before you finish speaking (up to 0.5 seconds ahead) or generate coherent speech translations with ultra-low latency.

■ Features

・Ultra-low-latency speech-to-text and speech-to-speech translation (preview) — translations appear before you finish speaking
・Real-time translation from the moment you speak (live subtitles)
・All you need is your smartphone—no need to hire expensive human interpreters or carry bulky dedicated translation devices
・Translation results can be shared and saved as text instantly
・Multilingual support (see "Supported Languages" below)

■ How to Use

1) Open the app
2) Press the microphone button and speak
3) Translations appear on screen in real time
4) Connect your headset or earbuds via the headset button for speech-to-speech translation

■ Perfect for These Scenarios
・Don't want to miss what others say in online or in-person meetings
・Frustrated with the wait times and usability of conventional translation apps
・Want to have richer conversations with locals while traveling or on business trips abroad
・Want smoother customer service and reception for international visitors

■ Media & Events

Featured on NHK, TV Tokyo, Forbes Japan, Abema TV News, and more.

■ Supported Languages

・English ⇔ Japanese
・English ⇔ Chinese
・Japanese ⇔ Chinese
・Japanese ⇔ Korean
・English ⇔ Spanish (coming soon)
・English ⇔ Korean (coming soon)

■ Plans

The Unlimited Plan (monthly/yearly) removes the 5-minute session limit and the 1-hour monthly usage limit.

*Latency, accuracy, and predictive display may vary depending on network conditions, device performance, and ambient noise.

Terms of Use: https://www.kotoba.tech/terms

Experience the moment when language barriers disappear—download now.

What’s new

Kotoba provides the extremely low-latency and high accuracy speech translation for East Asian languages and English.