Contextual sentence breakdowns
Review line-by-line meanings in your native language, discover natural idioms, and understand why native speakers express it that way.
Kaico Speak Up
Memorizing vocab lists won't help when you freeze up in front of a foreign client. Tell Kaico what you need to achieve, and it builds practice scenarios around that task to get you speaking.
- 9 languages, any pairing Learn any target language using your native tongue
- Built around real tasks Your exact scenario, level, and story so far
- Speak in every session Hold the space bar to talk in a computer browser
- Listen
- Break down
- Words
- Shadowing
- Build the sentence
- Speak
Buenas tardes. ¿Me deja su pasaporte, por favor?Good afternoon. May I see your passport, please?
Claro. Tengo una reserva a nombre de Miller, para cinco noches.
Gracias, señor Miller. ¿Quiere añadir el desayuno?Thank you, Mr. Miller. Would you like to add breakfast?
Hold the space bar to talk, release to stop
Every conversation starts with language.
Real-time translation software is convenient, but live meetings and business trips still demand speaking for yourself. Eye contact, tone, and pacing build trust that no machine translation can deliver. Learn the language of the person you need to talk to, explained in the language you know best.
Learning the same language, but facing completely different situations
Different roles need completely different phrases. A sales representative needs to negotiate pricing and resolve specification differences; an engineer needs to run progress meetings and report troubleshooting steps. Kaico tailors dialogue to what you will actually face next week.
Sales
¿Nos puede explicar los precios?Could you walk us through the pricing?
Claro. El primer año incluye la instalación y la formación.
Generated from what you said: "Visiting a client in Madrid next month"
Engineer
¿Cómo vamos con el problema del inicio de sesión?Where are we on the login issue?
Ya encontramos la causa. El arreglo estará listo el jueves.
Generated from what you said: "Weekly meetings with the team in Mexico"
Practice the language of the people you actually speak to
Supports 9 major languages with 72 bidirectional pairings. Regardless of the target language, sentence structures, stuck-point hints, and real-world reference documents are all explained in your native tongue, letting you focus entirely on spoken delivery.
- English
- 中文Chinese
- 日本語Japanese
- 한국어Korean
- EspañolSpanish
- Tiếng ViệtVietnamese
- ภาษาไทยThai
- РусскийRussian
- FrançaisFrench
For example, learn Japanese through Chinese to meet clients in Japan, English through Vietnamese to report to headquarters, or Spanish through English for a business trip to Madrid.
Progressive native language hints
When you get stuck, receive situational context first, followed by key vocabulary and complete sentence models.
Bilingual reference documents
Scenario attachments like booking confirmations and train tickets include precise native-language glosses.
Every session finishes with live spoken dialogue
Model dialogue & structure breakdown
Listen to a model run of the same task, with different details from yours, then unpack key sentence patterns piece by piece.
First, listen to yourself handle this smoothly, with details different from this time.
Hola, bienvenido. ¿Tiene una reserva?
Sí, tengo una reserva a nombre de López, para dos noches.
Just listen · click or press T to show the text
Break down
- tengo una reservaI have a reservation
- a nombre de Lópezunder the name López
Shadowing & substitution
Practice pronunciation for unfamiliar vocabulary, and substitute your own names, dates, and numbers into sentences.
Wordsla reserva · reservation, booking
Shadowing 1/3Sí, tengo una reserva a nombre de López, para dos noches.
Build the sentence
Tell the front desk your booking is under Miller, for five nights.
- Tengo una reserva
- a nombre de Miller,
- para cinco noches.
Each step adds one chunk; at the end, say the whole sentence without the text
Real-time spoken dialogue
Complete multi-turn spoken dialogue with AI characters to get the task done. Receive up to two natural expression suggestions immediately afterward.
Gracias por venir hoy. ¿Está libre el jueves para cenar?Thanks for coming in today. Are you free for dinner on Thursday?
Sí, estoy libre. ¿A qué hora es bueno para usted?
More natural to say
¿A qué hora es bueno para usted?
¿A qué hora le viene bien?
To ask what time suits someone, Spanish speakers usually say "le viene bien".
Characters remember prior agreements
Characters retain continuous memory. Prices, delivery deadlines, and agreed locations from earlier sessions stay active in subsequent talks, while each new unit adapts its difficulty to how you have been doing.
LLucía · front desk
JJavier · client contact
MMarta · Javier's colleague
- 1 Taking a taxi from the airport Done
- 2 Checking in at the hotel Done
- 3 First meeting at the client's office Up next
- 4 Dinner with Javier and Marta Preparing
The story happens in this order, one scene per session
Free conversation with story characters
Chat freely with people you have met in your story—they remember your prior discussions.
Scenario audio drama
Turn your storyline into an episodic audio drama for immersive listening on your commute.
Daily micro-reading
Receive a short situational story daily based on your current story progression to maintain linguistic intuition.
Dynamic Vocabulary Recall
Words and phrases you are about to forget resurface naturally in subsequent story chapters.
Start from your current proficiency
One-minute starter chat
The first time you practice a language, you chat for three lines in it, about a minute. New accounts learning English take a 5-minute starter lesson instead.
Starter track from scratch
Start with the starter week: build your first set of practical phrases across seven everyday situations, from greetings and prices to ordering and asking for directions.
Dynamic difficulty progression
Whether beginner, intermediate, or advanced, each new unit adjusts its difficulty to how you have been doing.
Questions People Ask
Do I need to sign in to use Kaico?
Yes. Practice happens at /kaico/app/, and you sign in with your ArchCross account first. If you are not signed in, Kaico takes you to the sign-in page and then straight back to practice. This introduction page is open to everyone.
Do I need a microphone?
The talking steps are meant to be spoken. On your computer, hold the space bar to talk. Your browser's built-in speech recognition turns your voice into text, and Kaico's server receives only that text, never a recording.
Without a microphone, or in a browser without speech recognition, you can type your answers at every step. When the model conversation plays, listen first, and click or press T when you want to see the text.
Which languages does Kaico support?
Nine: Chinese (Traditional, Taiwan usage), English, Japanese, Korean, Spanish, Vietnamese, Thai, Russian, and French. Pick your native language and the language you want to practice from these nine; any two different languages work together, 72 combinations in all, and the interface appears in your native language.
Can I use Kaico as a beginner or with no background at all?
Yes. The first time you practice a language, Kaico listens for your current level. A new account learning English starts with a 5-minute starter lesson with Kai; for other languages, you chat for three lines in that language for about a minute, and if you cannot answer, you press "I don't understand / can't say it". With no background at all, start with the starter week: seven very short everyday situations, including greetings, numbers and prices, ordering, and asking for directions.
Each time a new unit is planned, its difficulty takes your earlier sessions into account. After a few days away, the session you come back to gives you a little more help.
Where is my practice history stored?
In your ArchCross account. Sign in with the same account on another computer and you can pick up where you left off, and if you leave a session halfway, you pick up from that same step next time. The next session is prepared in the background, usually in less than a minute. For some languages, read-aloud uses a voice model downloaded to your device; it stays in that browser, so a new device downloads it once more.
Which devices and browsers work?
Use the latest Chrome, Edge, or Safari on a computer. Phones and tablets aren't supported yet: Kaico reads aloud by running a voice model on your device, which phones and tablets can't handle, so Kaico asks you to switch to a computer. In Firefox, you type your answers in the talking steps.
The first time you practice a language, Kaico asks you to download a voice model and listen to a sample. Download it over Wi-Fi if you can. If your computer can't run it, Kaico explains why and suggests one with 8 GB of memory or more.
Practice for your next high-stakes foreign conversation today
After you sign in, select your target language and describe what you want to practice. Your first customized practice scenario starts generating right away.