OLL 39
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
L F' L' U' L U F U' L'9 moves · with the left hand
How to recognise it
A big lightning bolt: the left and right edges with the front-left and back-right corners. The front-right corner's yellow faces right.
Its inverse is another case
Do the 39 algorithm backwards, L U F' U' L' U L F L', and you are solving 32.
That's why CubeDojo never scrambles 39 that way: it builds a random state with the case fixed, so you practise 39 and not 32.
Practise 39 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.