Kotoba - Voice Translation

"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.

■ Privacy & AI Notice

・Kotoba records voice you choose to submit and generates transcripts/translations to provide real-time translation. ・We collect audio, transcripts/translations, and related account, device, and usage data. ・For individual users, unless you opt out, audio and transcripts may also be used to improve, evaluate, or train Kotoba's AI systems. ・Enterprise customer data is used only to provide the service and is not used for model training. ・Privacy Policy: https://dashboard.kotobatech.ai/privacy_en.html

■ 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

■ Plans

The Unlimited Plan (monthly/yearly) removes the 5-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.apple.com/legal/internet-services/itunes/dev/stdeula/

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© 2026 Kotoba Technologies Inc.