Guided Meditation/Mindfulness Apps

Anyone use them? Which ones? Have you found them useful?

My wife has been using Insighttimer for a long while. All sorts of yoga and stretching classes, talks, guided meditations, the whole nine. Definitely recommended.

Downdog. A subscription nets you a yoga app alongside the meditation app (and a few others). Sales vary, 33% now, was 75% a couple of days ago.