Diapo shows the photos of a folder or a whole disk full screen, subfolders included, on Mac, Windows, iPhone and Android.
In short: no account, no ads, no analytics, no data sent over the Internet. Your photos stay where they are: Diapo reads them and never edits, moves or deletes them.
The app is published by Atria.Eponym, an individual developer based in France. Contact: atria.eponym@gmail.com
Diapo reads the photos of the folders, disks or photo library you open, on your device. They are never sent anywhere. Thumbnails are kept in memory while they are shown and never saved.
All of this stays in the app's own storage on your device and goes away with it.
When you ask for it, Diapo copies the photos of a selection into the folder you chose. The originals are not touched, no existing file is replaced, and nothing is deleted. When you share a photo, the system (share sheet, clipboard) passes it to the app you pick; Diapo itself sends nothing.
If you open a Google Drive, OneDrive or iCloud Drive folder, the service itself, installed on your device, downloads the photos to show, under your account with it. Diapo receives and sends nothing to these services.
Diapo is free during the trial period, then bought once. Payment is handled entirely by your device's store (App Store, Microsoft Store or Google Play), under your account with it: Atria.Eponym receives neither your card, nor your name, nor your e-mail address. The app only asks the store whether Diapo was bought.
Diapo collects no personal data: there is nothing to look up or delete at Atria.Eponym. Deleting the app deletes its settings, your favorites and your selections; the copy folders stay yours. For any question: atria.eponym@gmail.com. You may also contact the CNIL (www.cnil.fr).