A five-minute check
Kairos is a DJ app in the making. This shows you a few of its screens and asks one question about each. There's no wrong answer: it's testing the screens, not you.
Use your own phone, in a dim room, at the brightness you normally have it on.
Go through the five in order. Some screens show for a few seconds only, so read each question first.
At the end, copy your answers and send them back to whoever sent you this link.
You'll see a screen for three seconds. Then: what's happening between the two records?
The same screen, as long as you like. Are these two records in the same key? What told you?
A busy booth screen. Which control does the app want you to touch? Tap Found it as soon as you know.
The same screen. Hold your phone at arm's length and read out B's tempo and the bar number under the playhead.
A page of reading, for 30 seconds. Read as far as you like.
How easy was that to read?
1 is hard, 5 is easy.
Last bits
Then paste them into a message to whoever sent you this.
All seven screens
If you're curious: the five above come from these. Each has an A | B switch at the top. A is how the design stood before a round of fixes, B is after.