FAQ
Fair questions, straight answers.
If yours is missing, ask us via the contact page and we will answer personally.
Product
What is Kata, in one paragraph?
Kata is a personal health OS with an AI coach as its front door. You talk: chat, voice, or a photo of your plate. The system does the rest: it logs weight, food, water, training, sleep and supplements, keeps your charts and streaks, remembers your decisions and plans your day around phase goals like Cut or Build. All of it lives on your device.
Do I still have to fill out forms and search food databases?
No. You say “weighed 101.6, whey shake after training” and Kata turns it into structured entries you confirm with one tap. Photos work too: point the camera at a plate and get a protein estimate. Classic quick-log buttons exist for the days you would rather tap than talk.
Is Kata a medical product?
No. Kata organizes your own health routine and offers general, AI-assisted coaching. It does not diagnose, treat or replace a doctor, physiotherapist or dietitian. For medical questions, see a professional; Kata will tell you the same.
How does voice input work?
Tap the microphone, talk, done: your words are transcribed and handled exactly like a typed message, so “big glass of water and 20 minutes on the bike” becomes two entries to confirm. People use it while cooking, walking or driving. Replies can also be read aloud in a voice you choose.
Does Kata replace my trainer or my doctor?
No, and it does not try to. Kata is the daily layer: it carries a plan through the week, keeps the numbers honest and answers at 22:00 when nobody else does. A good trainer, physio or doctor stays exactly as valuable; many users bring their trainer’s program into Kata and let it hold them to it. For anything medical, see a professional; Kata will tell you the same.
What are phases?
A phase is your current goal, stated plainly: Cut, Build, or your own variant. The phase sets the targets (protein, water, training focus, bedtime), and every module and every coach answer works toward it. Change the phase, and the whole system re-aims.
Privacy & data
Where does my data actually live?
On your device. Logs, chat history, Kata's memory of you, photos and integration tokens are stored locally, never on our servers. To coach you, your messages and context are sent to the AI to generate a reply, then kept by no one: that is how Kata is built, not just a promise. Details in the data & privacy model.
What does the server see?
- Your account basics: email and sign-in timestamps.
- How often the app is opened and when it was last active.
- Aggregate AI usage numbers for fair use: never what was said.
- An abstract picture of you the app computes on your device: an archetype word and coarse traits like activity level, sleep pattern or phase. Never names, numbers or content.
- Your invite status and your plan.
- Standard technical hosting logs (IP, request time) at Vercel.
Never on our servers: your chats, your logs, your photos, Kata’s memory of you, your decisions. Those live only on your device. We never build an advertising profile from this data and never sell it. The marketing website does use basic, aggregate visitor analytics you can decline, and it never touches any of this.
Can I export or wipe my data?
Yes. The app has a full JSON export (use it as your backup, since we cannot restore what we never had) and a wipe that clears everything from the device. Deleting your account removes the email record too.
What happens when I talk to Kata?
Your message plus the minimum context needed to answer is sent, encrypted, to our AI provider and processed there, transiently. We do not store these requests. Voice is transcribed and photos are analyzed the same way, only when you send them.
Does Kata learn from my data?
Yes, in a way we are proud of. Kata learns from abstract patterns: things like “morning trainers with a steady sleep rhythm stick to their plans”: so the product gets better for everyone. What it learns from is a coarse, anonymous sketch (an archetype and traits like activity level or sleep pattern), computed on your device. Never your chats, never your logs, never your photos, never anything that tells your story. Those stay with you, full stop.
What happens to my data if I delete my account?
Deleting your account removes your email and sign-in record from our systems; that is all we ever held. Your health data is only ever stored on your device, so wiping the app clears it completely and instantly. There is no server copy to hunt down, which is the point. Export first if you want a backup: we cannot restore what we never had.
How do the physique photos stay private?
Progress photos are stored only on your device, like everything else personal. They are not uploaded to a gallery, not synced to a server and never used for anything but your own before/after view. If you ask Kata to analyze one, the image is processed transiently for that answer and not stored.
The AI coach
Which AI model runs Kata?
Kata runs on our own coaching intelligence, Kata AI, included free during the launch phase. Behind the scenes it uses several large language models and picks the right one for the moment. It reads your data on your device, can render charts from your own numbers in the chat, and checks the web when facts matter.
Do I need my own ChatGPT or Claude account?
No. Kata AI is built in: it is part of the product, there is nothing to connect, no key to manage and no separate AI bill. You open the app and talk.
Does Kata adapt to how I write and live?
Yes, and that is most of its value. It learns your shorthand (“the usual shake” means your shake), your schedule, your lifts, the way you talk about hard days. Decisions land in a memory you can read and edit, so Kata gets more yours over time without ever guessing in the dark.
Getting started, pricing & invites
How do I sign up and create my profile?
Registration is open: go to app.yourkata.com, create your account and verify your email, or sign in with Google, Apple or a magic link. Then set up your profile whichever way you prefer: talk it through with Kata in a short conversation, or fill in a classic profile flow yourself. Either way takes a few minutes, and everything stays editable later.
What does Kata cost?
Right now Kata is free for everyone. After launch, every new account still starts with one Month free, then chooses a plan: Kata Plus, with the integrations, the referral program and 500 Kata AI interactions per Month, at 19; or Kata Unlimited, with everything in Plus plus unlimited Kata AI, priority support, early access and partner offers, at 39 per Month. Prices show in your region (CHF, EUR or USD), and early users keep free access until they choose. Details on the pricing section.
How do I cancel or change my plan?
Once paid plans are live, you change or cancel any time from your account settings in the app: no email, no phone call. Switching between Kata Plus and Kata Unlimited takes effect right away, and cancelling keeps your access until the end of the period you already paid for. While Kata is free there is nothing to cancel.
What do the fair-use limits mean in practice?
Kata Plus includes 500 Kata AI interactions per Month: that is 16 real exchanges a day, more than almost anyone uses, since one message often logs several things at once. Logging, charts, streaks and everything non-AI stay unlimited on every tier. If you genuinely talk more than that, Kata Unlimited removes the ceiling.
How does Invite a friend work?
Earn 3, give 1: 3 Months of Kata for you for every friend who joins, and 1 free Month for each friend you invite. Invites are sent from the app. While Kata is free your invites already count, and the reward applies once paid plans go live. Full mechanics in the invite docs.
Which languages does Kata speak, and where is it available?
Kata works worldwide, wherever you can reach the app. It understands and replies in the language you write in, and this site is available in English, German, French, Italian, Spanish and Swedish. Prices adapt to your region in CHF, EUR or USD.
How do I reach support?
Through the contact form, or by mail to contact@yourkata.com. A human reads every message and replies personally, usually within a day or two.
Integrations & devices
Which integrations does Kata support?
WHOOP and Apple Health. From WHOOP: recovery, HRV, resting heart rate, sleep stages and strain sync overnight. From Apple Health, or Health Connect on Android: steps, active energy, workouts, sleep and weight. Your own entries always take priority, the connection stays on your device, and Kata never keeps a copy. Details in the integration docs.
Is Kata a mobile app?
Yes, and it is built for the phone first. Kata is a native app on iPhone and Android: home-screen icon, full screen, notifications and nudges, everything where you expect it. On any computer it also runs as a web app in the browser, on the same account and data.
How do I install the app on my phone?
On iPhone, open app.yourkata.com in Safari, tap Share, then Add to Home Screen. On Android, open it in Chrome and tap Install app when prompted, or from the menu. Kata then behaves like a native app, with its own icon and notifications. Step-by-step help lives in the docs.
How do I back up my data?
Two ways. On iPhone your Kata data is included in your encrypted iCloud device backup, and on Android in the equivalent Google device backup, so a new phone restores it along with the rest of your device. You can also use the built-in JSON export any time and import it on another device. Since your data lives with you, keep an export as your own safety net.
Which devices and browsers work?
The app on iPhone and Android, and the web app on any computer in Chrome, Safari, Edge or Firefox. Switching to a new phone is a two-minute ritual: export on the old device, install the app on the new one, import, done. Your data lives per device; proper sync is on the roadmap and will be announced honestly.