iPhone Screenshots


The New 15C is simulator of 15c Scientific Calculator with below functions.

◇Decimal style (1,234,567.89 1.234.567,89)

◇Quick User Guide

◇Contact Support


* RPN logic with 4 stack levels plus a last X (LSTx) register.

* 67 addressable registers, used for storage registers or program

* 19 storage registers in default configuration with 46 registers for programs (appx. 332 program steps).

* Programmable with up to 448 program steps. In this configuration only 3 storage registers are available: R0, R1 and RI

* 10 Flags and 12 conditional tests, such as x = 0, x ≠ 0 and x > y.
Indexed looping via storage gegister I.

* Full storage arithmetic: STO +, −, × and ÷.

* 5 softkeys, labeled A through E.

* Multiple number format: FIXed, SCIentific and ENGineering.

* Trigonometric functions SIN, COS and TAN.

* Hyperbolic trigonometric functions SINH, COSH TANH.

* Three trigonometric modes: DEGrees, RADians and GRADs.

* Reverse trigonometric functions for standard and hyperbolic functions.

* Mean and standard deviation of 2 variables.

* Summation of n, x, x2, y, y2 and xy for statistic calculations of 2 variables.

* Decimal hours and hrs.min.sec. conversions.

* Polar and rectangular conversions.

* Solve and root finder.

* Numeric integration.

* Linear regression.

* Complex numbers.

What’s New

Version 1.2

Hello All,
Sorry to keep you all waiting for the "Keyboard sound on/off" feature.
This update includes
- iOS 14 compatibility
- Added keyboard sound on/off
- Updated the new app icon
- Fixed the color background
- Fixed bundle display name

Ratings and Reviews

3.5 out of 5
4 Ratings

4 Ratings

JonC30 ,

No portrait mode?

This 15C calculator app doesn’t appear to work in Portrait mode. It only displays in Landscape mode. I would have asked the developer if I missed a setting for this but he is only on Facebook and I’m not on Facebook.

Developer Response ,

Thanks for your report. We are fixing the issue.

AI Architect ,

HP calculator fan

The developer has fixed the installation problems. I've started working with the app and I like it. Just want to say thank you for fixing the installation problem :). I will find out how to delete my unfavorable review so the statistics better reflect my satisfaction with the developers work

Developer Response ,

Thanks for your report. We are fixing the issue.

doctorphys ,

Responsive Developer

The developer has a cool HP 15C and recently responded quickly when I used the contact feature on his HP 16 C, another cool app, to tell him that the HP 15C app was not downloading for my iPhone 11. He fixed things fast. Many thanks.

Developer Response ,

Thanks you for your support. We are glad to see new ideas. If you want to join us, don't hesitate to contact us!

App Privacy

The developer, nguyen ngoc khanh, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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