Use APKPure App
Get Calculator old version APK for Android
Le coffre-fort de la calculatrice vous aide à masquer vos fichiers dans un dossier secret.
This application for people who want to save files to secret and TOP SECRET FOLDER. It is safe because you can also set password for your single file as well to protect from ones who knows about this app.
Additionally, you it has several cool features like fingerprint usage, multi language functionality, shake lock and so on.