What I love about my iPhone, Marylee Pangman, is speech to text. I dictate most of my work to get my truest, conversational over beers/coffee voice. Then I edit from that.
If an idea pops up, into Notes I go.
My #1 recommendation for a writing app is Ulysses. HANDS DOWN best I’ve ever used, and all my files are in one place like a huge library. I appreciate markdown to minimie distractions and LOVE LOVE LOVE the “publish draft to Medium” feature. It is expensive, but I can’t say enough about it.