Cryptomator vs Rclone Crypt or something else?

I would also nudge a bit towards Cryptomator too. Since it has a GUI, and is a bit easier to use than Rclone crypt. I do think you need the official provider sync tool to use with Cryptomator. You also need to download/sync your files locally before you can decrypt. With Rclone, encryption/decryption is done on the fly.

You also don’t need the official sync tool from your provider with Rclone. While it’s better if a provider supports Rclone directly ( Documentation ), you can still use Rclone with SFTP (for Hetzner and rsync), and S3.

For me, I use Rclone mount with Rclone crypt for my Linux machine to backup some media with my custom bash script. I use Rclone more for automated backups. I have Rclone mounted as a folder in KDE Dolphin, under /mnt/rclone-folder. Kinda like if I mounted a hard drive to my Linux machine

The following is a command i have in a bash script to mount rclone:

rclone mount--volnamerclone-box rclone-box-encrypt: /mnt/rclone-folder/

I used this guide to setup Rclone crypt with my provider. Setup end-to-end encrypted cloud drive using rclone · Szymon Krajewski

There is RoundSync for android too. You can also try Rclone with Termux