Proprietary AI 'Koto' delivers high-accuracy interpretation
Supports Japanese, English, Chinese, Korean, and Spanish. Real-time subtitles and live translation, with Koto delivering practical, real-world quality.
Translate real conversations, faster
Kotoba Technologies' speech foundation model 'Koto' predicts conversational flow. Translation is delivered up to 0.5 seconds ahead, preserving natural conversational tempo. Latency from speech to translation display is under 1 second. Supports Japanese, English, Chinese, Korean, and Spanish.
* Predictive translation is supported in subtitle mode only. Latency varies by environment, language, and speaking style.
Featured in
TV Tokyo
Abema Prime
NHK
See it in action
Experience speaks louder than words. See how predictive translation keeps conversations flowing without interruption.
What makes us different
Unlike other translation apps, we predict conversational flow to keep dialogue moving — while pursuing accuracy at every step.
Translation appears before you finish speaking
AI predicts conversational flow and delivers translation up to 0.5 seconds ahead — reducing wait time and keeping conversations natural.
Under 1 second from speech to translation
The longer translation takes, the more you lose your timing and control of the conversation. With latency under 1 second, you never miss a beat.
Use cases
Business
Keep up in meetings and negotiations before the speaker finishes. Never miss your timing to respond.
Conferences
Understand key points in real time, even in meetings held in a foreign language.
Travel
Directions, ordering food, hotel check-in — keep short exchanges flowing without awkward pauses.
Learning
Great for listening practice and pronunciation checks. Subtitles help you understand faster.
Get started in 3 steps
For negotiations, meetings, or customer service. Install, speak, understand.
1
Install the app
Download from iOS / Android and get started right away.
2
Just speak naturally
Have your normal conversation. Predictive translation with low latency keeps up with you.
3
Check translations & transcripts
Understand via subtitles, review or share logs later.
What users say
Focused on the experience of conversations that never stop flowing.
★★★★★
Almost zero waiting time
We started using it for weekly meetings with overseas suppliers. Translation appears before the speaker finishes, so the conversation never loses its rhythm. The experience is completely different.
★★★★★
Perfect timing in negotiations
I use it every time in negotiations with English-speaking clients. Being able to respond on time is a game changer. Conversations flow naturally even in meetings.
★★★★★
Peace of mind with subtitles
Used as a support tool for on-site interpretation at exhibitions. Even if I miss something, I can catch it in the text. Being able to review later is also really helpful.
Pricing Plans
Start for free. We also offer an Unlimited plan for professionals and an Enterprise plan for organizations.
Free
Try it free first
Per month
Up to 1 hour
Per session
Up to 5 min
- Real-time subtitles & live translation
- Japanese / English / Chinese / Korean / Spanish
Recommended
Unlimited
Professional interpreters charge $200+/hr. Unlimited for $99/mo.
Translation time
Unlimited
Translation history
Available
- All Free plan features
- iOS: $99/mo or $999.99/yr
- Android: $99/mo
Enterprise
For teams & organizations
- All Unlimited plan features
- Admins manage members centrally — instant onboarding via invite
- Priority support included
$95 / device / mo
View Enterprise Plan
* USD price is approximate, converted from ¥15,000/device/mo at the exchange rate as of 2026-03-05.
FAQ
Common questions about predictive translation, latency, and supported languages.
Is it free to use?
Yes. The Free plan includes up to 1 hour per month and 5 minutes per session at no cost. An Unlimited plan is also available for extended use. See the app or store listing for details.
What languages are supported?
We support 5 languages: Japanese, English, Chinese, Korean, and Spanish. Check the app for the latest supported languages.
Is the prediction speed and latency always the same?
Predictive speed (up to 0.5 seconds ahead) and translation latency (under 1 second) may vary depending on environment, language, and speaking style.
Do you offer enterprise or event solutions?
Yes. For teams of 5 or more, the Enterprise plan is available at $95/device/mo (approx., converted from ¥15,000/device/mo at the exchange rate as of 2026-03-05). View the Enterprise plan. For conferences, exhibitions, and large-scale events, please contact us here (Google Form) (opens in new tab).
Any media coverage or case studies?
We've been featured on TV Tokyo, Abema Prime, NHK, and more. Our technology was also used for live transcription at NVIDIA's AI Summit Japan 2024.
Simultaneous Interpretation
for Conferences & Events
Depending on the PR partnership, complimentary usage may be available. For international conferences, exhibitions, seminars, and other multilingual events. Distribute the app to attendees for real-time subtitles and live translation.
- Complimentary usage possible with PR partnerships
- Supports 5 languages: Japanese, English, Chinese, Korean, and Spanish
- Attendees use their own smartphones — no special equipment
- Low-latency predictive translation even at large-scale events
- Flexible proposals based on event size and duration
Contact Us (Google Form) (opens in new tab)
* After submitting the form, our team will follow up with you.
Simultaneous interpretation that keeps your conversations going
Predictive translation with low latency preserves your conversational timing. Try it in the app.
App Download
Try it on your phone
Download from the App Store or Google Play to experience predictive translation in real conversations.
Store links
* Links will redirect to the respective app store.
For teams & events
Need rollout for your company or event?
Centralized admin, unlimited translation, and priority support are available on the Enterprise plan.