Correctly eyeballing lengths and distances is unquestionably a handy skill. Could you improve it by playing a game? Some say video games can improve reaction time and tactical thinking in real life. At least that's what the US army thinks anyway.
In Draw In you must approximate the length of an object's outline. If this sounds complicated, then pay attention!
You get the outline of a kitten, right? You tap on the screen and hold. Not necessarily on the kitten, although you can. As you keep pressing, you'll see a straight line being drawn up. You then lift the finger, the line stops and begins to wrap around the figure. If it manages to pass the black section, you're fine. However, if it overlaps, then that's bad.
There are four hundred images that you can discover by outlining. The better you approximate, the more detailed the final result will be. The rating system is for your consideration only. There's no need to acquire a certain number of stars to unlock the next batch.
There's not much else to write about Draw In. You tap, you release, you see the result, repeat. There seems to be some more content coming soon, but as it is not yet in place, there's no reason to speculate. Still, I wonder what "Endless Mode" means.
It's not like you needed a TLDR, but here goes. Draw In is in perfect accordance with the new European privacy laws. You can voluntarily opt out of data collection, although the app will cry a little if you do that. If this feature doesn't spur up your curiosity, at least know that there are some cute chibi animal drawings in there.