Abstract : The study’s basic aim was to assess nursing students' understanding of first aid (FA) and (BLS) procedures and to educate them about FA and BLS by doing comparative study to evaluate the effectiveness of Simulation Assisted Training Program (SATP)Vs Mobile App based training Program on First Aid and BLS. A quasi- experimental study to evaluate the effectiveness of the Simulation Assisted Training Program (SATP) Vs Mobile app-based Training Program (MABTP) on First Aid (FA) and (BLS) on knowledge and practice among the undergraduate nursing students in selected Universities of Haryana. In SATP group; the posttests mean score of knowledge was 52.40±12.520. In MABTP group, the posttests mean score of knowledge was 49.64±8.480. The mean difference was 2.760. The t48=.913, p=.366which indicate that non-significant at 0.05 level. In SATP group; the posttests mean score of practice was 189.96±28.940. In MABTP group, the posttest mean score of practice was 166.24±38.505.Themean difference was 23.72. The t48=2.462p=.017which indicate that significant at 0.05 level.In SATP group; the posttests mean score of knowledge was 72.56±7.665. In MABTP group, the posttests mean score of knowledgewas57.72±9.298.Themeandifferencewas14.840. Here in dependent ttest wasapplied to find out statistically significant result. The t48=6.157, p=.001 which indicate that highly significant at 0.01 level. In SATP group; the posttests mean score of practice was 200.16±24.693. In MABTP group, the posttests mean score of practice was169.96±37.776.The mean difference was 30.20. Here independent t test was applied to find out statistically significant result. The t48=3.346, p=.002 which indicate that highlysignificantat0.01level.