The framework of portal interactions between the Standard Model and a hypothetical invisible sector has gained renewed attention in recent years, with particular focus on light beyond the Standard Model states, which are ideal candidates to be tested at high-intensity experiments. In this contribution we review three main portals between the Standard Model and the invisible sectors: the dark photon portal, the sterile neutrino portal and the dark Higgs portal. After introducing their main characteristics we review current exclusions and projected limits on these theories, highlighting the existing complementarity between high-intensity and high-energy experimental probes.