Yesser Calculator is a graphical calculator built with .NET and the Avalonia UI framework. It provides a cross-platform application for everyday arithmetic and scientific calculations.
The calculator supports standard mathematical operations alongside powers, roots, factorials, logarithms and trigonometric functions. The supplied operations extension includes separate trigonometric functions for degrees and radians.
A distinguishing feature is its extensible architecture. Mathematical operations are supplied through extensions rather than being restricted to a fixed set of built-in functions. The project includes interfaces for creating extensions and templates intended to simplify their development. This approach makes Yesser Calculator interesting to developers who want to add mathematical operations to a desktop calculator.
This is free and open source software.
Key Features
- Perform basic arithmetic and scientific calculations.
- Supports exponentiation, roots, factorials, logarithms and natural logarithms.
- Provides trigonometric functions using degrees and radians.
- Uses an extension system for adding mathematical operations.
- Includes extension interfaces and project templates for developers.
- Cross-platform support – runs on Linux, Windows and macOS.
Website: github.com/yesser-studios/yesser-calculator
Support:
Developer: yUser
License: GNU General Public License v3.0

Yesser Calculator is written in C#. Learn C# with our recommended free books and free tutorials.
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