There are three common ways to answer «how hard was that», and each one is useful for something different.
RIR
With RIR, you count what you had left. It is the easiest to estimate in the moment and the one the app uses on the set chip.
RPE
With RPE it works the other way round: from 1 to 10, how hard it felt. It is the same information seen from the other side.
Percentage of max
A percentage of your 1RM. Precise on paper and misleading in practice: your max today is not the one from last week.
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