In fact, Pico488 (also available as Pico488 DNA quantification kit) is a structural analog of PicoGreen (PG) and it is designed to quantitate the dsDNA (see constants compared to SG and EB in the article published by Dragan et al., 2012). It is considered that quantitation with PG is tolerant to ssDNA, but we don't have the exact constants for binding between ssDNA-Pico488

There is the reference below about interaction of PG with ssDNA:

Nakayama et al., 2016  (S1 Fig. Standard curves of single-stranded DNA quantification)