How it works,
and how your privacy is kept.

The point of this is simple: you get a heads-up about trends in your own health before they slip past you. Here is how that happens.

Pattern detection runs first, and it is straight math. More than fifty detectors look at the data you log and check for things you would have to be watching closely to catch: a jump in how often a symptom shows up, a slow creep in severity, an "afternoons are worse" cluster, a brand-new symptom, a dip in keeping up with your Medications, or a win worth celebrating. Because every detector is math, the reason behind any insight can always be traced back to the numbers.

Once a pattern is found, supported iPhones can use Apple’s built-in on-device language model to turn the figures into a sentence you can read at a glance, such as “Fatigue is up 48% this week, mostly in the afternoons.” Your notes, food names, and voice transcripts never leave the device for this writing step, and there is nothing for an outside company to read.

The text streams in sentence by sentence, so you are not watching a blank screen while the summary is prepared. The wording is shaped for the place it appears, home cards, Symptoms detail, Visit Prep, or a day-at-a-glance summary, so each one reads the way that screen needs it to.

These limits exist so the summaries stay focused on what was recorded, while medical decisions remain with you and your doctor.

It observes, you and your doctor decide. We did not want a chatbot that pretends to know medicine. We wanted a quiet helper that surfaces patterns and leaves the deciding to the people in the room.

It never prescribes. The writing feature is instructed not to suggest treatments, name causes, or tell you what to do. Every line is an observation. Advice-style words like "should", "try", "consider", and "diagnose" are stripped out after the text is written.

The output is cleaned before it reaches you. Every response is checked first: advice phrasing is removed, web links are taken out, and the length is capped. So even if a stray link slips into a Symptoms note, it can never reach you as something clickable.

It asks you to agree first. Before personalized written summaries turn on, you accept a short note that says it straight: Valeska helps you organize your own health info, it is not a substitute for medical advice. The same note rides along on your Visit Prep export.

It works even on older iPhones. If a phone cannot prepare personalized wording on-device, Valeska falls back to ready-made explanations. You still get the same pattern checks and observations. No one is locked out for having last year’s phone.

The payoff here is control: your records live on your phone, and only you can open your backup. Here is what that looks like in practice.

Encrypted on your device. Everything you log, Symptoms, Medications and doses, Nutrition, Water, Mood, Documents, and vitals, is saved in a private, locked store on your phone. There is no account, and we don’t keep a copy.

Locked when your phone is locked. The store on your device is encrypted with a key held in your iPhone's secure hardware and guarded by your passcode. Lose the phone and the data can't be read. Delete the app and the key is destroyed with it.

You decide what leaves. To share with a doctor or a loved one, you make a Visit Prep summary or save a copy and send it yourself. Valeska never sends your records to anyone on its own.

Lab results stay on your phone. If you import lab results from Apple Health Records, they live only on your device. They are never uploaded to us, and never included in written pattern summaries. Medications you import from your providers behave just like the ones you added yourself.

No analytics, no crash reports. The app doesn’t send us usage data, crash reports, or diagnostics. If something goes wrong, you can tell us by email, and you decide what to include.

Take it or delete it, anytime. Every part of the app can be exported, and Visit Prep makes a doctor-ready PDF on demand. You can delete everything from Settings, with no support ticket.

Your backup goes to your own storage, not ours. On iPhone and iPad it is saved in your private iCloud, locked with keys only you hold, plus a recovery code. Only you can open it. Not even we can.

Got a new phone? Restoring from your backup is the first choice when you set up the app. On Android, your records stay on your phone. “Save a copy” makes an encrypted backup file you can keep wherever you like, and you can open it on a new phone.

Caregiver sharing and syncing between devices have ended. Each phone keeps its own records, and nothing passes through a server we run.

We are not a hospital or insurer, and we don't pretend to be. HIPAA, the U.S. health-privacy law, may not bind a personal app like ours. But we built Valeska the way those rules would expect if it did: encrypted storage, no copy on our servers, collecting only what's needed, and a delete button that truly deletes. People living with a chronic condition deserve that standard whether or not the law requires it.

What we do:

We lock all stored health info with a key unique to your device. We encrypt your backup with keys only you hold before it leaves your phone. We keep no account and no copy of your records. We collect no analytics, crash, or usage data in the app. And we let you delete everything from Settings.

What we don't do:

We never sell, rent, or share your data, with anyone. We never send your health info to an outside language model or advertising service. We don't embed ad trackers. We don't read, claim to read, or replace your doctor's advice. And we won't hold your data hostage if you don't pay. After the free week you can still view, export, back up, and delete it.

Valeska is a tool. A doctor is a doctor. The app helps you see what you've been logging and bring a tidy summary to your next visit. It is not a diagnosis tool, not a clinical decision system, and not a replacement for professional care. Every written summary is an observation only, it never recommends, prescribes, or advises.

You accept this note before personalized written summaries turn on. The export PDFs carry it in the footer, and the Visit Prep header tells your doctor what they're looking at.

For emergencies, call 911 or your local emergency number. Don't open an app first.