In the current investigation, the accuracy and reliability of two pairs of Footscan pressure insoles (500 Hz, RSscan, Belgium) was assessed, with four female (pair 1) and four male (pair 2) participants each performing 16 running trials (3.8 m/s ± 5%). Intraclass Correlation Coefficients (ICC) revealed that the reliability of the force and pressure data was generally excellent (ICC > 0.75). In comparison with impact and propulsive force data collected simultaneously with a force plate (AMTI, 500 Hz), insole data were significantly lower (p < 0.05). Therefore, despite the excellent reliability of measurements, the accuracy of the impact and propulsive forces taken with the Footscan pressure insole is low. It is concluded that data collected without appropriate calibration should be used with caution, particularly if the aim is to use the data for a comparison of absolute force and pressure magnitudes with criterion values.