RADI Privacy Policy

Last updated: October 3, 2026

RADI is a free app that helps people prepare for and get through radiotherapy. It is made by Dimitri Bragilovski ("I", "me"), an independent developer. This policy explains what happens to the information you put into RADI.

The short version: RADI works offline. There is no account and no server. Everything you enter stays on your phone. I do not collect, see, sell or share your information. It leaves your phone only if you choose to share it.

1. What RADI stores

RADI only stores what you choose to enter. All of it is optional except a name or nickname, which the app uses to greet you. This may include:

• About you: name or nickname, gender (optional), and a profile picture (optional): an emoji or a photo.
• Treatment details: treatment site, hospital, city/country, department, doctor, nurse, treatment machine, dose, number of sessions and working days.
• Appointments: dates, times and notes for treatment sessions, simulation, and doctor and nurse visits.
• Journal: mood, pain and fatigue ratings, notes and photos.
• Skin Check: skin condition ratings and photos of the treatment area.
• Hydration: daily water intake, goal and reminder times.
• Sleep: sleep quality, hours, what disturbed your sleep, notes.
• Practice and progress: breathing practice sessions (such as breath-hold times) and progress in the app.
• Questions for your care team that you write down.
• Settings: language, theme, reminder choices and similar preferences.

RADI does not ask for your email, phone number, ID number, contacts or location. It does not create an account.

2. Where it is stored

Your information is saved only on your phone, in RADI's private app storage. Photos you take or choose in RADI are kept in that private storage. RADI does not save photos to your phone's photo gallery.

RADI does not add its own encryption. Your data is protected by your phone's built-in security, such as device encryption and your screen lock. RADI has no app lock, so anyone who can use your unlocked phone can open RADI. Please use a screen lock.

3. What I collect: nothing

• RADI has no server and no network features. The app does not send your information anywhere.
• RADI has no analytics, advertising, tracking or crash-reporting tools, and no third-party code that collects data.
• Education videos and content are built into the app. Using them sends nothing over the internet.
• Reminders are local notifications created on your phone. No push service is used.

I cannot see your information, so I cannot access, sell or share it.

Apple and Google may give developers general statistics, such as download numbers. If you allowed it in your phone's settings, they may also give anonymous crash reports. Apple and Google handle this under their own privacy policies. It does not include what you enter in RADI.

4. When information leaves your phone (only when you choose)

• Doctor Report. You can make a summary report and share it as a PDF or text through WhatsApp, email, your phone's share menu, or by copying it. You pick the sections, choose "Share with name" or "Share without name", and choose who gets it. After you share it, that copy is handled by the app you used to send it (for example WhatsApp or your email app) and by the people you sent it to. RADI cannot change or delete it.
• Phone calendar (optional, off by default). If you turn on Settings → Phone calendar → Sync sessions to phone calendar, RADI adds your upcoming appointments to a calendar named "RADI" on your phone. Each event has a title that shows the type of appointment: "Radiotherapy session", "Doctor visit", "Nurse visit" or "Simulation session" (in the app's language). It also has the date and time, an alert that matches the reminder you chose for that appointment (for example 15 minutes or 1 hour before, or none; appointments saved by older versions without a reminder choice keep a 1-hour alert), and, if you entered them, your hospital, department, city and country as the location. RADI does not add your notes. So anyone who can see your calendar can tell that these are radiotherapy appointments. If your phone calendar syncs with an online account (for example iCloud or Google), these events may be copied to that account and your other devices. That happens through your phone and account settings, outside RADI's control. To remove them, turn the setting off and tap "Turn off": RADI then deletes the events it added. From version 2.2.3, Full Reset also deletes them (see section 7).
• Links. Links to medical sources and websites open in your browser only when you tap them. RADI does not send your information to those sites.
• Contacting me. If you email me, for example with the "App feedback" button on the FAQ screen, your email app sends the message. I receive what you send, such as your email address and message. I use it only to reply and do not share it.

5. Permissions

RADI asks for a permission only when you use the feature that needs it. You can say no, or change it later in your phone's settings. The rest of the app still works.

• Notifications: for the reminders you turn on, such as drinking water or treatment prep.
• Camera and photos: to take a photo, or choose one from your photos, for your Journal, Skin Check or profile picture. On many phones you choose photos in the phone's own photo picker, and RADI receives only the photos you pick. RADI does not save photos to your gallery.
• Calendar: only if you turn on "Sync sessions to phone calendar", to add, update and remove RADI's appointment events.

RADI does not use your microphone, location, contacts, or Face ID/fingerprint.

6. Backups

• iPhone: your normal iCloud or computer backups of your iPhone can include RADI's data, as with most apps. Apple manages those backups under your account.
• Android: RADI's health information is not included in Google's automatic app backup. Only a few small settings files may be backed up, such as scheduled reminders.

7. Keeping and deleting your information

Your information stays on your phone until you delete it.

• Delete everything in the app: go to Settings → Reset App and tap Full Reset, then confirm with Full Reset. RADI then takes you back to the start of the app. From version 2.2.3, Full Reset removes everything RADI stored:
  • all the information you entered in RADI;
  • the photos RADI kept in its private storage (Journal, Skin Check and profile picture) and the report files it created;
  • the reminders RADI scheduled on your phone;
  • the appointment events RADI added to your phone calendar, and the "RADI" calendar itself. Calendar sync is then off.
• Restart Setup (in the same section) only restarts the setup screens. It does not delete your data.
• Delete the app: this removes RADI's data, photos and reminders from your phone. Deleting the app cannot remove calendar events RADI added, so use Full Reset (or turn off "Sync sessions to phone calendar") first.
• What RADI cannot remove, because it is outside RADI:
  • Doctor Reports you already shared. Those copies are handled by the app you used to send them and by the people you sent them to.
  • phone backups made earlier (see section 6).
  • copies of RADI's calendar events that your phone already synced to an online account (for example iCloud or Google). They are removed there when your phone syncs the deletion, which can take some time.
  • calendar events, if you turned off RADI's calendar permission in your phone settings. RADI does not ask for permission again during a reset. In that case, delete the "RADI" calendar or its events in your calendar app.
• Earlier versions: before version 2.2.3, Full Reset erased the information stored in RADI but did not remove calendar events, scheduled reminders or photo copies. Running Full Reset in version 2.2.3 or later removes leftover reminders and photo copies. If "RADI" events are still in your calendar, delete them in your calendar app.

8. Your rights

Depending on where you live, privacy laws may give you rights to access, correct, delete or export your personal information. I do not hold any of your information, so you can use these rights directly on your phone. You can view and edit your information in the app, share it with the Doctor Report, and delete it with Full Reset (which from version 2.2.3 also removes RADI's reminders, calendar events and photo copies; see section 7) or by deleting the app. If you have a question, email me.

9. Children

RADI is meant for the general public and is not intended for children under 13. I do not knowingly collect information from anyone, including children.

10. Not medical advice

RADI provides general information and self-care tools. It is not a medical device and does not diagnose, treat or give medical advice. Always follow your medical team's instructions. In an emergency, contact your care team or local emergency services.

11. Changes to this policy

If this policy changes, I will post the new version on this page and update the date at the top. If a future version of RADI handles data differently, this policy will be updated before or when that version is released.

12. Contact

Dimitri Bragilovski
Email: d.bragilovski@gmail.com