I like Joplin, but it's a poor experience on iOS. Besides the material design theme feeling out of place, scrolling is weird/slow compared to other iOS apps, including webpages in Safari, and there's no gestures, so I have to reach all the way to the top to go back to the note list instead of swiping from the left of the screen like every other app I have installed.

Although it's not open source like Joplin, I've switched over to Obsidian.