The RLM-15CX calculator is an extensive set of tools and enhancements inspired in the real HP-15C calculator. It works in the same way, but expanded with 15 digits precision, 999 program steps and a complete set of menus to handle almost any scientific, financial or business problem (toggle tapping the "OPT" key). Also, the Display was expanded to show all the Stack registers and, in landscape orientation, the content of the storage registers, flags, statistic register, matrices and program memory.

Finance Account Balance Amortization Bonds Price & Yield Black-Scholes Options Equal Periods Cash Flows Unequal Periods Cash Flows Depreciation Interest Rates Time Value of Money	Business Bill-Tip-Split Break-Even Currency Exchange Percents & Margins	Date / Time
Statistics (X,N) List-> One-List Statistics (X,N) List-> Two-Lists Statistics (X,N) List-> Curve Fitting (X,Y) List-> Statistics (X,Y) List-> Curve Fitting Probabylity	Scientific Complex Numbers Matrix Plane Triangle Solution Spherical Triangle Solution Universal Constnats Vectors 3D	Conversions Angles & Polar Currencies Interest Rates Units
Program	Solver	Utilities General Settings Memory Content (Date,Trx) List Editor (Date,CF) List Editor (X,N) List Editor (X,Y) List Editor Program Editor Solver Equation Editor Units Database Editor

Once the app is installed for the first time in your device, you have 30 days of a fully functional "Free Trial". After, to continue using the app, the store view is shown asking to do a one time payment for lifetime.