One of the best markdown writers I have ever used is iA's Writer for Mac (and iOS) https://ia.net/writer/mac/ https://ia.net/writer/mac/ They have an Android

One of the best markdown writers I have ever used is iA's Writer for Mac (and iOS) https://ia.net/writer/mac/ https://ia.net/writer/mac/ They have an Android version as well, but I have not used it.