Yes. I use simple notes on grapheneOS with no network access.
If you’re paranoid still, a physical notebook and a pencil would do the trick.
Discussion
Not enough. The NSA can hear your pencil strokes through nearby listening devices to capture your thoughts. 😏
You need to take your notebook somewhere **really remote** to be out of sight/earshot, but even then, the NSA will know where you went. 🤣
