OLL 7
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
r U R' U R U2 r'7 moves
How to recognise it
A small lightning bolt: the back and left edges with the front-left corner. The front-right corner's yellow faces you.
Its inverse is another case
Do the 7 algorithm backwards, r U2 R' U' R U' r', and you are solving 6.
That's why CubeDojo never scrambles 7 that way: it builds a random state with the case fixed, so you practise 7 and not 6.
Practise 7 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.