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This app use nsurvival() function in gsDesign package

Reference

Lachin JM and Foulkes MA (1986), Evaluation of Sample Size and Power for Analyses of Survival with Allowance for Nonuniform Patient Entry, Losses to Follow-Up, Noncompliance, and Stratification. Biometrics , 42, 507-519. Schoenfeld D (1981), The Asymptotic Properties of Nonparametric Tests for Comparing Survival Distributions. Biometrika , 68, 316-319.
https://CRAN.R-project.org/package=gsDesign