Stellar activity remains one of the main limitations to discovering low-mass planets. In radial velocity (RV) searches it induces extra RV jitter, hampering the detection of semi-amplitudes below ~1 m/s. Moreover, this signal is usually quasi-periodic which can lead to false-positive exoplanet detection. However, one way to address this challenge is to observe at multiple wavelengths as the activity-induced RV variability is chromatic. In this talk, I will introduce the synergy project between SOPHIE at OHP and SPIRou at CFHT, two high-precision spectrographs in the optical and near-infrared, respectively. I will show its M-dwarf sample, main goals, and results. In particular, I will present our recent analysis of the chromaticity of the stellar activity signal in two M-dwarfs with different activity levels, one very active[1] and another moderately active[2], and the detection of a planetary system around the primary component of a close-in binary system[3].