Methane pyrolysis has been a topic of research in both energy technology and aerospace propulsion. Variousaspects such as heat transfer, catalytic materials and chemical kinetics as well as carbon deposition behaviourhave been in focus. However, the temporal behaviour of pyrolysis and carbon deposition has received relativelylittle attention. Considering the effect of maintenance on programme costs, it is important to have sensors withgood time resolution both in the laboratory and in operational systems. Therefore, it is of interest to investigatethe efficacy of real-time sensors that have the potential for integration into systems with real-world applications.Speed of Sound (SoS) transducers and Thermal Conductivity Gauges (TCG) have the potential to produce high-quality measurements at relatively low cost and in a compact form factor; however, they have not yet beendemonstrated in this research area. Therefore, the current work assesses their performance compared to gaschromatography (GC), using a newly developed experimental setup. It is shown, for the conditions tested, thatreal-time and in-flow SoS and TCG sensors can attain measurement quality comparable to that of the GC used;however, this performance is implementation dependent. Specifically, PCB based TCG and Time-of-Flight basedSoS measurements are found to be highly effective in capturing the dynamic characteristics of the methanepyrolysis process. Although the current indication is promising, further work is necessary to test the approachunder representative operational conditions specific to, for example, aerospace propulsion applications.