Pinyin
Pinyin where you need it, and nowhere else.
Pinyin sits above the characters, the way it does in a good graded reader. Set it to All, Above my level or Off. Above my level uses the HSK level you choose, so words you already know stand on their own and new ones keep their reading.
Tone colours are there if you want them. The translation under each sentence can be hidden. Simplified or Traditional, whichever the page was printed in, at the flick of a switch.
In the app: Reader → Display
All
我每天早上去公园散步。
Above my level (HSK 2)
我每天早上去公园散步。
Off
我每天早上去公园散步。