Briar App.

Be careful with who you share these apps with. Do not give any app ID you have on Messenger apps to just any person on here. Keep you Messenger app ID's out of reach of the scammers. Anyone can access the biography of your home page for the website here you are using right now to view this. Briar is my app of choice. I installed it in my old Samsung Galaxy phone (not saying which specific sub-model/make of that phone.) It works fine if you install it with F-Droid. Use F-Droid to replace your "App store" and delete your data from your Google apps and app accounts on Apple or Google Android Phones. Delete preinstalled apps on your phone or laptop. Anyone can attack those. Do not ever share your Briar account with someone unless you really trust them. And only if they know how to use Briar should they use Briar. F-Droid can be installed on Linux, Apple, Android, Windows. Apple iphone does not have it because they don't share with iphone for security reasons. Apple Doesn't want them on iphone to replace the App store. So why would they go there if they are forbidden by Apple Inc? They are forbidden because they are competition for the "App Store" on iphone, and Apple dislikes greatly the competition to App store. Do not ever share any info you do not want to share with anyone. There is no cloud. Only other computers.