I‘m using Standard Notes. It’s Text only, which is both a blessing and a curse: it avoids me spending time making notes look pretty, but sometimes I want to paste images too.
The really good things of Standard Notes:
- cross platform
- open source: easy to do whatever you want with your data.
- encrypted. I just feel more at ease knowing no one can go through my notes. Not even to serve me ads with the purpose to make me buy stuff I wouldn’t have missed otherwise.
They have a paid option that includes markdown editors and some other features.