Calcoo – RPN and algebraic scientific calculator
license: GNU General Public License
feedback: calcoo.calculator@gmail.com
  

Calcoo 3 (C#)
screenshot   screenshot
RPN (Windows dark mode) algebraic (Windows light mode)
  
download Calcoo 3 (.Setup.exe 3Mb)
current version: 3.0.1 (Mar 14, 2026)
requires: .NET 9 Desktop Runtime
dev page: GitHub
  

Calcoo 2 (Java)
screenshot   screenshot
RPN mode in Windows 11 algebraic mode in Debian Linux
  
download Calcoo 2 (.jar 159Kb)
current version: 2.1.2 (Mar 14, 2026; changelog)
requires: Java 8 or later
help: how to run calcoo.jar
dev page: SorceForge