A system-defined KPI is a KPI that has a predefined formula which cannot be changed.
Our system-defined KPIs cover most of the common financial ratios used by financial analysts.
A custom KPI is a KPI that you can build yourself with our formula builder.
This is useful mainly for modelling non-financial data.
For example, you can build a KPI that tracks whether or not your lead conversion is on target for a given period.