The relative strength index is one of the most popular technical analysis indicators.

We recommend users to use our open-source free RSI indicator. We have added 2 panels to provide relevant information about the price at critical levels for the RSI plus when it crosses its EMA . You also can manually enter a value fort he RSI and see what the price is going to need to be for RSI to generate that given value.

Free RSI with Reverse Calcualtor :

Free RSI


If you want to improve the accuracy of RSI to another level, we bring you the Impossible RSI indicator.

We used an error-correcting smoothing technique, fisher transform, log transformation and high pass filter to make it a smooth, low lag, zero mean, near gaussian distributed oscillator. (Similar to MOM but applied to RSI value).

Impossible RSI smoothed with Distribution Profile:


Our advanced smoothing technique makes the indicator more smooth than traditional RSI, our error-correcting fitler makes it smooth and low lag at the same time. We normalized the value to have a zero mean instead of traditional scale from 0 to 100.

Impossible RSI with no smooth:


Distribution Profile of Impossible RSI with no smooth :


If users want more consistent distribution of the Impossible RSI. Impossible RSI without smooth is a good option.

Users can adjust the length of the band to have a dynamic overbought and oversold level

Short Length Band:


Impossible RSI Settings :

Impossible RSI indicator link :