Privacy policy
Who is responsible
The controller is Cortexa Social, Inc. Contact: i@cortexa.social. A postal address is available on request by that email. Privacy requests go to the same address. This policy does not name a separate data-protection officer.
What Eterna is
Eterna organizes what you record and what your lab reports and devices show, by date and with the source of each number. It can estimate a biological age (PhenoAge) from lab values you confirmed, and it offers an optional AI coach and an educational meal plan.
Eterna does not diagnose, does not recommend medicines or doses, and does not replace a physician or any other professional. It is not an emergency service.
What we handle
- Account: email and a password of at least 8 characters. The authentication service stores the password. Confirmation and recovery use a 6-digit code.
- Profile: name and date of birth (both optional), height, time zone and language. Time zone and language are updated from your device.
- Treatments you type: name, ingredient, route, the regimen you entered and what you used (quantity, unit, frequency), purpose, presentation, application site, notes, pauses, changes and remaining applications.
- Check-ins: well-being, energy, sleep, appetite, weight, symptoms (with intensity and free text) and notes.
- Measurements: weight, waist, hip and, if you enter them, body fat or muscle mass.
- Meals: time, description, a photo if you add one, and the items and portions you confirm. Energy and nutrient figures are estimates from a food database.
- Labs: the file you upload (PDF or image, up to 20 MB) and the values read from it. A value counts only after you confirm it. Comparison uses the range printed on your report.
- Apple Health: the daily values described below.
- AI coach: your messages, the replies and the plans you request.
- Meal plan: goal, sex, date of birth, weight, height, activity level, meals per day, restrictions, allergies, target weight if entered, and answers about pregnancy, breastfeeding, kidney disease, insulin use and eating disorders (with a “prefer not to say” option). These answers decide whether a plan can be offered and what it must avoid.
- Reminders: times, quiet hours, a daily cap and what you want remembered.
- Consent choices: purpose, text version, decision and date.
- Usage records: for each AI call, the feature, model, status, token counts and cost, with no content. Product events by name only, such as “signup completed” or “first meal saved”, with no medicine, quantity, symptom or lab value. Campaign parameters (utm and ref) if the app was opened from a link.
Device permissions
- Camera: only when you tap to take a picture.
- Photos and files: through the system pickers, for the items you choose. The app saves a picture to your library only when you choose to save a share card.
- Apple Health: only the data types you authorize.
- Location and other metadata (EXIF, GPS, XMP) are removed from meal and lab images on the server.
- Eterna does not ask for your location or contacts and does not record audio.
- This version does not send remote push notifications. Reminders appear inside the app.
Apple Health
On iPhone, if you connect Apple Health, Eterna reads only the types you authorize: steps, active energy, exercise minutes, sleep, resting heart rate, heart rate variability, VO2 max, blood oxygen, respiratory rate and body weight. This includes what other apps, such as a watch or ring app, write to Apple Health.
- Samples are read on your iPhone. Our servers receive one value per day for each type, with the name of the device or app that produced it. Raw samples are not uploaded.
- We use this data to show your readings and conclusions. If you allow the AI coach, a 7-day summary is part of what is sent to OpenAI, as described below.
- Apple Health data is never used for advertising and is never sold.
- The published app does not write to Apple Health.
- “Disconnect and delete this data” in the app deletes the copies we hold. To remove the permission on your iPhone: Settings › Health › Data Access & Devices.
Artificial intelligence
AI features are optional. Each depends on a permission you can withdraw at any time under Privacy and permissions.
| Feature | What is sent to OpenAI | Permission |
|---|---|---|
| Reading a meal photo | The photo | Reading by artificial intelligence |
| Reading a lab report | Images of the pages, and the text of PDFs that are hard to read automatically | Reading by artificial intelligence |
| Wording of a reminder | The name of the symptom or treatment mentioned in it | Reading by artificial intelligence |
| AI coach and 4-pillar plan | Your message, the recent conversation and a summary of your records: age, height, goal, names of logged treatments, lab results you confirmed, meal averages, check-ins, weight and watch or ring data | AI coach |
| Educational meal plan | Calculated daily targets and the list of candidate foods | AI coach |
- The coach does not send your name, email, documents, the name of the lab or the notes you write.
- OpenAI does not use this data to train its models. Under its policy it may keep records for up to 30 days to prevent abuse.
- Readings are suggestions: you review and correct them before anything is saved.
- Emergency signs receive fixed guidance without going to the AI.
- Without these permissions, nothing is sent to OpenAI. You type items and values yourself, reminders use a standard text, and the coach and the meal plan are unavailable.
Who processes the data
| Provider | What it does | Where |
|---|---|---|
| Supabase | Database, sign-in, confirmation and recovery email, and storage of lab files and meal photos | United States (Ohio) |
| Railway | Background processing of lab files, meal photos, reminders, the coach and meal plans | Netherlands |
| OpenAI | The AI features above, only with your permission | United States |
| Vercel | Hosts this website. It holds no app records | Global network |
Your data may therefore be processed outside the country where you live. Food figures come from USDA FoodData Central tables stored in our own database, and nothing about you is sent to USDA.
No advertising and no sale of data
We do not sell your data. The app has no advertising, third-party analytics, attribution or crash-reporting software, and health data is not given to any marketing tool.
This website sets no cookies, runs no visit counter and loads nothing from other servers. It remembers your language choice in your own browser. As the host, Vercel processes technical request data such as your IP address.
When data leaves because you choose
- Export my data: a JSON file of your records. It does not include the bytes of photos and PDFs.
- A PDF report and an image card, made on the device and shared only if you choose.
- After they leave your device, the recipient is outside Eterna’s control.
Research
Research participation is optional and separate. Refusing it does not change what the app does. This version shares nothing for research. Sharing would be turned on only after a legal and ethics review, and only with a new choice from you.
How long data is kept
Records stay while the account exists. You can delete a coach conversation at any time, and disconnecting Apple Health deletes the values copied from it.
After a deletion request, the account and personal data are deleted within 30 days. Backups are purged within 90 days. After that, only data the law requires us to keep is retained: a deletion receipt, the consent history, and operational records with no health content. Details are on the account deletion page.
If an account is linked to a clinic, self-service does not delete that clinic’s clinical records. Access ends immediately, and those records stay only for as long as the law requires.
Security
Data travels over HTTPS. Database rules let a signed-in person read only their own records, and lab files and meal photos are kept in private storage. There is no payment inside the app.
Age
Eterna is not directed at children. Signup does not check age.
Your requests
In the app, in your profile (the avatar at the top of Today):
- Export my data.
- Privacy and permissions, to change your choices.
- Delete my account.
- Sign out, which ends the session on that device and does not delete the account.
For anything the app does not do by itself, including access and correction, write to i@cortexa.social. You can also contact your data-protection authority. In Brazil, that is the Autoridade Nacional de Proteção de Dados (ANPD).
Changes
This policy is effective November 9, 2026. When the text changes, the date at the top changes. When an in-app consent text changes version, the app asks for your choice again.