A lot of people recommend this app for encryption when I looked it up online. So I got it for Windows found it worked well. Then got the app from F-Droid, but it asked for money. I'm not opposed to buying a one-off license for apps, but I noticed this was on sale to celebrate 10 years and nobody has mentioned it here yet, so I figured I'd make a post.
The app itself is pretty easy to use. Install the app, make a vault, set a password (biometrics too), then access the vault through the network location on Windows, or within the app on Android. Add files, lock the app, and the files end up looking like gibberish when you go directly to them. You can put the vault on a cloud too, just get the app for the cloud and put the vault there. This lets you manage the E2EE, not the cloud. If you get hacked, then they can't steal anything that you encrypted. It's also a good method to deal with clouds getting told to make back doors in their E2EE. You don't need to rely on the company to support E2EE encryption, you can do it yourself. As for back doors for chat apps, that's another topic.
I don't have an iPhone but I'm pretty sure it's also $15 for it too, but you need to download the app to see the price.
They offer more stuff but I'm mostly interested in the 62% discount for a lifetime subscription to a popular FOSS app. I'm pretty sure you can just build the app for free since the code is open source, but $15 for life, supporting the devs, and not having to do the work to build it myself seems reasonable to me.
![[Android, iOS] Cryptomator: Lifetime Licence $15 (Was $39.99) @ Cryptomator & Apple App Store](https://files.ozbargain.com.au/n/12/951612.jpg?h=17377b39)


OneDrive already has a vault, built in.