Objective: The aim of this study was to investigate skeletal, dental and soft tissueeffects of Forsus Fatigue Resistant Device (FRD) and Jasper Jumper appliances incorrection of Class II malocclusion.Methods: 33 patients were divided into two groups as treated with Forsus FRDappliance (18 subjects: 8 females, 10 males-mean age: 15.79 ± 1.50 years) andtreated with Jasper Jumper appliance (15 subjects: 9 females, 6 males-mean age:16.12 ± 1.58 years), randomly. Initial and final lateral cephalometric radiographieswere traced and analyzed digitally. The data were analyzed statistically.Results: In the assessment of the skeletal parameters, both two groups had similaroutcomes and there were no statistically significant differences (p>0.05). In bothgroups ANB, Convexity angles and Wits values decreased and maxillomandibulardiscrepancy improved on sagittal plan. Maxillary incisors were proclined in ForsusFRD group, and maxillary incisors were retroclined in Jasper Jumper treated groupand there was a statistically significant difference between groups (p<0.05). In theassessment of mandibular incisor, proclination occurred in both two groups. In the softtissue evaluation, facial profile was improved through upper lip retrusion and lower lipprotrusion and there were no statistically significant differences between groups inthese values (p>0.05).Conclusion: The skeletal and soft tissue effects of the Forsus FRD and JasperJumper appliances were similar while there were some differences in dental effects.Some factors such as skeletal age, cephalometric values should be taken intoconsideration when making a choice about the fixed functional appliance.