I use google sheets
With the following key cells that automatically update asset values:
One looks up the price of the instrument in cell A1 (which might be HKG:0005, LON:CSPX or GOVT, or even the ISIN for an MPF fund).
The other looks up the exchange rate of a currency pair.
=GOOGLEFINANCE(A1,"price")
=GOOGLEFINANCE("CURRENCY:GBPHKD")