HeliBoard let's you move the cursor by swiping on the space bar. Is that what iOS does?

This is on pretty much all keyboards. It's on the standard G Board even. Look into the settings of whatever keyboard you're already using, it's likely just turned off.

Fossify Keyboard can do it

Why is there so much removed in these comments?

FlorisBoard is a good option, very customizable too https://github.com/florisboard/florisboard

This is a very basic feature, you have a lot of options to choose from like the other comments have suggested. I use Heliboard personally with glide typing.

unexpected keyboard also does this, as well as a dedicated arrow keys button. it's also open source and on both fdroid and play store.

• Unexpected Keyboard - also has a vertical cursor slide key.
• Thumb-Key - optional setting. Also works intuitively for text deletion on backspace. Text selection too but that's buggy.

Thanks folks! Floris and floris and heliboard do exactly what I'm looking for, floris seems better in my cojple of bours of testing 

Pretty sure most all of them do that?