First, it seems the app is named "Cryp
tomator", not "Crypomator". I mention this in case anyone is trying to find more info on the app.
Second, you can make an "encrypted vault" using nothing more than DiskUtility.app, which comes with every Mac.
You simply create an encryped disk image (a sparse bundle will be most efficient), then put all the files you want to protect on that disk image. When you want to edit the files, you open the disk-image, edit the files, then close the files and eject the image.
Learn how to use Disk Utility on your Mac to manage APFS volumes, test and repair disks, erase disks, and more.
support.apple.com
Third, you don't say who or what you're trying to defend against. Without that info, all anyone can suggest is general crypto software.
It's possible that Cryptomator is more convenient in some cases than working with a diskimage, but convenience shouldn't be the only criteria by which one evaluates cryptographic software.
I wrote a post recently about what distinguishes sparse bundle from sparse diskimage:
Where I mention "backup", you can substitute "sync to cloud". In other words, a sparse bundle will only copy modified band-files to the cloud, where a sparse image would need to copy the entire diskimage file.
