Squiid is billed as an advanced calculator.
It sports a terminal user interface supporting both RPN and algebraic input.
It has 3 components: a frontend, the engine, and a parser. The latter contains the library that is used to convert algebraic/infix notation to postfix notation that the backend can evaluate.
This is free and open source software.
Key Features
- Simple terminal user interface using Ratatui.
- Supports both RPN and algebraic input.
- Provides several built-in constants that you can use in your calculations.
- Support for storing and recalling numbers in variables.
- Access the previous answer with the @ character. This works in both algebraic and RPN mode,
- Plugin support will be added in the future.
- Cross-platform support – runs under Linux, macOS, and Windows.
Website: gitlab.com/ImaginaryInfinity/squiid-calculator/squiid
Support:
Developer: Connor Sample, Finian Wright
License: GNU General Public License v3.0

Squiid is written in Rust. Learn Rust with our recommended free books and free tutorials
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Read our verdict in the software roundup.
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