Are the ratios given a snapshot of the current value today or are they the average over a year for example. I am interested in knowing the Sortino Ratio over different time periods as an average such as 1 ,3 5 and 10 years or longer.

Does anyone know if this service providers this information before I subscribe to the service

Yes, it's totally possible to calculate the Sharpe ratio and other metrics over extended periods, such as 1, 2, 5, or 10 years. This is available to all Pro subscribers. You can open the Sharpe ratio calculator and select the lookback period that suits your needs.

The Sharpe ratio will then be calculated based on the annualized return and annualized volatility over your chosen period. It's worth noting, though, that this might vary slightly from calculating the mean Sharpe ratio over the same timeframe.