Records, not a summary
Say 82.4 and it becomes a point on a weight trend, not a sentence in a text.
Honest comparison
Kata vs ChatGPT.
ChatGPT is the best general assistant there is, and since July 2026 it reads Apple Health in the US. It still does not hold your health as structured data.
The verdictA brilliant generalist that now reads Apple Health in the US. Here is what it still does not keep.
First, fairly
ChatGPT at a glance.
What it is for
A general assistant for writing, thinking, coding and answering almost anything, on web, iPhone, Android and desktop, with memory, photos, files and web search.
What it costs
Free, Go at 8 USD a month (a plan that may include ads), Plus at 20 USD a month, Pro from 100 USD a month. Local currency in many markets, no annual billing.
Where it is strongest
The widest surface there is, and real comprehension work: hand it a twenty page blood panel and it explains it patiently.
Who it suits
Anyone whose hard part is understanding rather than doing, and who wants one assistant for everything.
The difference
What changes with Kata.
It stays on your phone
Logs, chats and photos live on your device, and nothing about you is sold or trains a model.
Built for one job
WHOOP, Apple Health and Health Connect wherever you live, and a week that closes itself.
Side by side
Row by row.
A gray mark means possible, but not on its own.
| Capability | Kata | ChatGPT |
|---|---|---|
| Your numbers as structured data | Yesweight, protein, sleep, water | Partlytrends from connected sources |
| Remembers you as records, not as prose | Yeseditable, in every answer | Partlya written memory summary |
| Wearable data shapes today | YesWHOOP, Apple Health (iPhone), Health Connect (Android) | PartlyApple Health, United States only |
| Your health data lives on your device | Yesno logs or chats we can read | Nocloud account |
| Never used to train a model | Yes | Partlyopt out, health data excluded |
| A week that closes itself | Yesthe Weekly Kata | Noonly when you ask |
| Built only for health | Yes | Nobuilt for everything |
Why Kata
Three reasons, not thirty.
One system
Food, training, sleep, supplements, labs and mood in a single place.
It decides
Not a dashboard you read: a coach that says what today should look like.
It stays yours
Your logs, chats, photos and Kata's memory live on your device.
Honestly
When ChatGPT is the better choice.
If the hard part is understanding rather than doing, ChatGPT wins. A dense study, questions before an appointment, thinking out loud: nothing beats a great generalist, and the free tier costs nothing.
In short
What, how and why.
- What
- Kata is a health coach built for one job, not a generalist.
- How
- What you say becomes a record on your phone, and gets worked with every day.
- Why
- You stop explaining yourself every morning. Trends, labs and supplements are already in the room.
One coach. Your whole picture.
Start free: the core stays free for good, and from 16 November every account begins with 30 days of Kata Plus. Set up in one conversation, in your own words.
Questions
Asked and answered.
Can ChatGPT read my WHOOP or Apple Health data?
Since July 2026 it can connect Apple Health in the United States, on web and iOS. There is no direct WHOOP, Oura or Garmin connector. Kata connects WHOOP directly and reads Apple Health on iPhone and Health Connect on Android.
Is my health data used to train the model?
OpenAI states that connected medical records and Apple Health information are not used to train its foundation models. Ordinary chats are, by default, with an opt out. With Kata your logs and photos live on your device and train nothing.
Checked 2026-07Competitor details change. We check these pages regularly and correct them when something moves: if you spot something out of date, tell us and we will fix it.
ChatGPT is a trademark of its owner. Kata is independent and is not affiliated with, endorsed by or sponsored by ChatGPT.
Kata is a coach, not a doctor. It supports everyday decisions about food, training, sleep and rhythm; it does not diagnose, treat or replace medical advice.