Objective: To determine the intra-evaluator and inter-evaluator reliability of the Physioplay-Kinect interaction and Trigno device for assessing the reaction time (RT) of cancer volunteers undergoing treatment. Methods: 46 cancer volunteers who underwent treatment modalities participated and were allocated into three groups: Chemotherapy Group (CG), Radiotherapy Group (RG), and Chemotherapy-Radiotherapy Group (CRG). The RT for all volunteers was assessed using the PhysioPlay™ and Trigno device. Results: In the intra-evaluator analysis, excellent levels of reliability (Physioplay: ICC> 0.99; Trigno 8: ICC>0.92) were observed in all groups. In the inter-evaluator analysis, excellent levels of reliability were observed in the CG (Physioplay: ICC= 0.98; Trigno 8: ICC= 0.98); excellent (Physioplay: ICC= 0.98) and good (Trigno 8: ICC= 0.44) levels in the RG; good (Physioplay: ICC= 0.49) and reasonable (Trigno 8: ICC= 0.29) levels in the CRG. Conclusion: The PhysioPlay™ and Trigno device proved to be reliable for assessing the RT of cancer volunteers undergoing treatment.