Rare strange particle decays

The rare decays $\mathrm{K}^+\to \pi^+ \nu \bar{\nu}$ and $\mathrm{K_L}\to \pi^0 \nu \bar{\nu}$ are extremely attractive processes to study flavor physics because they are both exceptionally clean from a theoretical point of view. These modes are measured by the experiments NA62 at CERN in Switzerland and KOTO at J-PARC in Japan, respectively. The latest results from these experiments together with future prospects are presented. The NA62 experiment has, besides the main goal, a rich physics program on other rare kaon decays which will be also discussed.