This is a set of interesting RSI's that were coded by Mladen some years ago called the Unsmoothed RSI.

As explained by Mladen:

Unsmoothed RSI custom SMA:
New using custom SMA but from the oldest bar in history.

Unsmoothed RSI 3:
I know that the name of the indicator is "un-smoothed" but decided to see what will happen to that version if a jurik smoothing was added to it. This is the result. So now we have an un-smoothed rsi with a possibility to smooth it using jurik smoothing.

If you ist to make it without smoothing, set the smooth parameter to <= 1

Unsmoothed RSI of Super Smoother:
The version with super smoother that corrects that metatrader 4 bug (in this one built in SMA is not used at all - stopping to have confidence in even the simplest metatrader functions by now). The difference is not going to be seen on longer RSI calculation period but rather on very short periods.