My recent choice has been Fira Mono.
Comic Sans or Architects Daughter.
Yes, love this one for non-UI text.
Roboto for Android, Helvetica Neue for iOS.
I just stick to single-weight of what we use in the actual product (Proxima Nova)
We do the same.
I used to make these pixel perfect wireframes dokuments with this Blokk font, specific color schemes, special wireframes-images and what-not. Nowadays I just draw grey boxes and use Helvetica. I just use enough details to get the idea across. On my last project I only used pen and paper. I've saved so much time it's silly when I compare. And I can use all that time iterating the idea. 10/10 Would recommend.
Adobe's Source Sans Pro. Neutral, looks good on retina, tons of weights. Free!
Anything that tickles my fancy really. For a long time I used Roboto Slab.
I try to use the typefaces I'm going to use within the project overall. As it's a decision I make early. Might seem odd, but I can't count the times I deviate from wireframes because it felt ideal at that point.
I recently discovered this technique for wireframing new flows within our current product. Using the actual UI font is a nice bridge between lo-fi and hi-fi mockups! "Mid-fi"?
- Edited for clarity
mid-fi? What's that? How does it differ from low/hi-fi?
I worded it poorly - I should have said that I consider this a "mid-fi" approach - bridging the gap between absolute barebones vanilla wireframes and full Photoshop/Sketch mockups.
Noto Sans CJK
Whatever my hand produces.