Updated 2026-11-13 · 中文
Your learning record stays on your phone; conversation text is used only to write replies and corrections, and our server doesn’t keep it. Usage statistics are anonymous and you can turn them off anytime.
Your learning record, phrasebook, review schedule, level, streak and settings are stored only on this phone and never uploaded.
What you mention about yourself in free talk (your job, hobbies, plans), a line on what each chat was about, and what your partner said about themselves are kept as short notes on your phone. They are sent along with each free talk, and once more when it ends so they can be tidied into a new record, so the next chat can pick up where you left off. People you meet again in lessons (the same hotel’s front desk, say) keep short notes on your phone of what you told them there (your name, where you’re from, what you booked), sent along with the lessons where you meet them again. Health, income, religion, politics and addresses are never kept. See or delete them under Me → What they remember.
Delete it all under Me → Clear my learning data; uninstalling the app deletes it too.
In a conversation, what you say (turned into text on your phone first; only the text is sent), the last few lines, the current lesson and the phrases due for review go to our server, where a professional AI model service we work with writes the reply and the correction. Our server doesn’t keep conversations.
“Your own lesson” sends the situation you describe, the live interpreter sends the sentence to translate with the two before it, and asking the tutor sends your question with the sentence or word it’s about, used only for the result and not kept. Looking up a word in the phrasebook only searches the dictionary on your phone and sends nothing.
Read-aloud uses the cloud voices by default: the sentences to read (characters’ lines, the narrator and sentences to say; text only) go to our server, where a speech synthesis service we work with voices them. The audio is cached on the server and on your phone so the same sentence needn’t be voiced twice. The server’s cache doesn’t note who listened, and when full it deletes what has gone unheard longest. Sentences from the live interpreter and free talk stay out of the server’s cache and are cleared within a minute of being voiced.
What you write under Me → Ideas and problems (reports included) is kept with the anonymous install id so we can read and act on it every week; if we adopt your idea, the id is how the membership days reach your app.
Please don’t type ID numbers, bank card numbers, passwords or other sensitive information into a conversation.
Our server is in Singapore. Each request carries the anonymous install id, to prevent abuse. The language model and speech services that help us are in mainland China, so conversation text and the sentences to read are sent there to be processed.
Its access log notes only the IP address, the time, the endpoint and the result, none of what you said, and is deleted after 6 months as the law requires. Anonymous statistics and feedback are kept until no longer needed, at most 2 years.
A language model service: handles the text sent by conversations, translation, explanations and your own lessons, and writes the replies.
A speech synthesis service: handles the text of sentences to read, and voices them.
A cloud server (Alibaba Cloud): runs our service.
Their names and filings are under Me → About. Beyond these the app has no third-party advertising or analytics SDK, and we don’t give your information to anyone else unless the law requires it.
To improve the lessons, the app records anonymous usage, such as which lessons you open, how many goals you reach and how long each turn takes. It carries only a random install id: nothing you said or typed, no phone number, device id or location.
For your own lessons only a general name for the situation is noted (e.g. “opening a bank account”); when the app breaks, only the page and the kind of error, never your words.
Turn it off under Me → Help improve Kaiko.
Microphone: only while you practice speaking: holding the talk button, your turn in hands-free practice and in free talk’s hands-free mode, and “Listen to them” in the live interpreter. Recordings are turned into text on your phone, never uploaded or kept. Without it you can still type and tap sentences.
Running in the background (a foreground service): hands-free practice and the interpreter keep speaking and listening with the screen locked, with a notification showing the whole time, and stop when you finish.
Notifications: only for the daily reminder you set, scheduled on your phone without going through our server. After a restart the app sets your reminder again (the boot broadcast) without opening itself. Practice works without it.
Network: to talk to the server and download voice packs. Audio settings: so practice plays through the right speaker or earphones. Vibration and keeping the screen on: to signal your turn, and so the screen stays lit during practice.
Sharing a poster (no permission needed): when the share page opens, the app asks your phone about each of these apps in turn, only to show their buttons: WhatsApp, Instagram, Facebook, Messenger, X, Telegram, LINE, KakaoTalk, WeChat, QQ, Weibo, Xiaohongshu and Douyin. It never reads the list of what’s installed, and the answers stay on your phone; the anonymous statistics note only which one you tapped. Save image puts the poster in your photos without reading anything else there.
Choose System voice under Me → Voice and your phone’s own voice reads, with no sentences sent to us (some makers’ speech engines do go online themselves). Offline, a downloaded voice pack or your phone’s voice reads.
The first time you open the app we ask you to accept this notice and the Terms of Use; nothing is sent and no permission is asked for before you do. Withdraw anytime under Me → Withdraw consent.
To see and delete: what’s on your phone is under Me → What they remember and Me → Clear my learning data. There are no accounts, so no account to close; to delete what may be on the server under your install id (feedback, anonymous statistics), contact us and we’ll answer within 15 working days.
We don’t sell data, show ads, or read your contacts, photos, location or device identifiers.
This app is a language practice tool designed for adults. If you are under 14, please use it with a parent’s or guardian’s consent and company.
The app is provided by Chunlin Zhou (Kaiko Labs). For any privacy question or complaint, or to delete data that may exist on our server, write to: getkaiko@gmail.com
This notice was updated on 2026-11-13 and takes effect from that day. If what is sent changes, the app asks for your agreement again.