Listen to this:
 - https://www.amazon.com/Random-Walk-down-Wall-Street/dp/03933...
 - https://www.amazon.com/Bogleheads-Guide-Investing-Taylor-Lar...
...but the "hodlometer.com" domain was registered 3 days ago.
It's trivial to develop an algorithm by cherry-picking parameters that will give any desired results for historical data.
But there's vast research on how it's impossible to predict/beat the market like this in reality , and this site is obviously designed to prey on the uneducated and naive.
 For a good intro, see chapter 5 of "A Random Walk Down Wall Street" which talks about "technical analysis", which is exactly what HODLometer is doing -- https://www.amazon.com/gp/product/0393352242