Aligned with the tunability of the redox-active components as the main advantage of organic redox flow batteries, the idea of integrating both anolyte and catholyte in the same molecule has been developed. Those so called, bifunctional analytes or combi-molecules allow to use the same material in both tanks, which definitely has relevant advantages on the battery performance, as diminishing the effect of crossover. Thus, diaminoanthraquinone, also a quinone, and indigo based molecules as well as TEMPO/phenazine combining molecules have been presented as potential electrolytes for the development of symmetric redox-flow batteries (SRFB).