Privacy
Last updated 19 October 2026
The short version: your diary stays on your device. There is no Rhyvia account and no Rhyvia server. On the Android app you can optionally sign in with Google so a copy is kept in your own Google Drive. You can also export a file whenever you ask.
Your health entries
Mood, sleep, symptoms, sick days, pain, lifestyle, medicines, supplements, cravings and notes are stored on the device where you enter them. In a browser that is the browser's own storage. In the Android app it is storage inside the app. Rhyvia uses that local diary to describe your patterns. The pattern-finding happens on the device.
If you use the browser page, clearing the site data, using private browsing, or switching browser or device can make that diary unavailable. Export a backup when you want a copy you hold yourself.
In the Android app, if the diary saved on the phone cannot be read, Rhyvia keeps that copy aside and does not write over it. Saving and Google Drive sync stay paused, so an empty diary cannot replace it.
Optional Google Drive sync
Drive sync is in the Android app, not in the browser page. The first time you open the app it can ask you to sign in to sync, or to stay on this device only. You can change that later in Settings. If you never sign in, the diary stays only on the phone.
Signing in uses your Google account. Rhyvia asks Google for three things: permission to see and change only the files this app creates (the drive.file permission), the email address of the account you sign in with, and the standard sign-in check (openid). It does not ask to read the rest of your Drive.
The diary file is named rhyvia-diary-v1.json. It lives in a folder named Rhyvia in your own Google Drive, not in Google's hidden app-data folder. You can open that folder yourself. Rhyvia's maker cannot. The file holds your daily entries, including sick days and pain, plus custom symptoms and lists, and a note of days or custom items you have removed so another install does not bring them back by mistake.
The same Google account can share that one file between the main app and the preview app. The sign-in token is used only to read and write that file with Google. It is not sent to a Rhyvia server. The email address is saved on the phone so the app can show which account is signed in. That address is not sent to a Rhyvia server either.
Rhyvia syncs a few seconds after you save, and again when you open the app or come back to it. Offline edits stay on the phone and sync the next time you are online. Signing out, or choosing to stay on this device only, leaves the diary on the phone and leaves the file in Drive. Rhyvia does not delete either one unless you delete entries yourself. If the file in Drive cannot be read, the diary on the phone is left as it is, and that file is left as it is too.
Android backup
The Android app allows the phone's own backup. If backup is switched on for the phone, Google can include the on-device diary in the backup of the app and restore it after a reinstall. That backup can also include the email address saved for sync. This is Google's backup of the app. It is separate from the Drive file above, and it is not instant. You control Android backup in the phone's system settings.
Exports and imports
Rhyvia creates an export only when you ask, from History. The file is JSON. It includes your daily entries, sick days, pain notes, custom symptoms and your custom lists. On the phone it is handed to the share sheet, so you choose where it goes. In the browser it downloads. Take care if you send it to another person, because it can contain sensitive health information.
In the Android app, importing a backup merges it with the diary already on the phone. For each day, the newer copy is kept. If both copies have the same time, the day already on the phone stays. A copy in the file with no time on it does not replace a day already stored. A day that is only in the file is added. Custom symptoms and lists are combined by name, and a name you already have is kept. A day you had deleted can come back if that day is in the file.
The browser page is an earlier diary. Importing a file there still replaces the same day already stored in that browser.
What is not sent
Diary entries are not sent to a Rhyvia server. There is no advertising tracker in the app or on this website, and your symptoms are not used to build an advertising profile. The Android app does not include an analytics service. A daily reminder, if you turn one on, is a notification on the phone. It is not sent anywhere.
The website host can still keep ordinary technical logs when it serves a page, as most websites do. Those logs are not your diary.
The browser page
The in-browser diary stays in that browser. It does not offer Google Drive sync. So the trends chart can draw, that page loads the Chart.js library from cdnjs (a Cloudflare service). The request does not include your diary. The Android app carries the same chart library inside the app and does not make that request.
Beta signup
If you join the Android beta from this website, the form collects the Google-account email you type and, if you add it, your first name. That is used to invite you to the Google Play test and to send essential testing updates. The site host processes the form so it can reach Rhyvia's maker. Those details are separate from anything you record in the app. They are not sold or used for advertising.
Your choices
You can use Rhyvia without joining the beta, and without signing in to Google. You can delete a day inside the app, or remove the app and its local data from the device. You can turn sync off. The file in your Drive stays until you delete it there yourself. Android backup is controlled in the phone's settings. To ask for a beta signup to be deleted, reply to any Rhyvia beta email you receive.
Health information
Rhyvia is a personal tracking tool, not a medical device. It does not provide a diagnosis or medical advice. Speak to a qualified healthcare professional about symptoms or treatment decisions.