Red Crab is a scientific calculator with a full-screen worksheet for entering mathematical expressions directly on a page instead of typing them into a command line. It supports algebraic notation such as fractions, square roots and exponents, and shows results below or beside each expression. Multiple calculations can share a page, and earlier results can be used in later tasks. Worksheets can be saved as a formula library, while bitmap images can add diagrams or other visual context. Freeware requiring .NET Framework 4.0 or later.

Red Crab is a scientific calculator built around a full-screen worksheet rather than a command line. It is intended for students, educators, engineers and other users who need to enter mathematical expressions in a readable layout and inspect results alongside the work. Expressions are placed directly on the page, making calculations easier to follow than a sequence of keystrokes in a conventional calculator.

The editor supports algebraic notation, including fractions, square roots and exponents. Red Crab displays each result below or beside its expression, so the relationship between an input and its answer remains visible. Multiple expressions can be arranged on the same page, which is useful for working through a longer problem or keeping related calculations together. Results from earlier expressions can also be used in subsequent tasks, allowing a calculation to build from one step to the next.

Worksheets can be saved and reopened, letting users keep calculations for later reference or assemble a personal library of formulas. This is practical for recurring technical work, classroom examples and study notes, where a prepared expression can be reused instead of entered again. Bitmap drawings can be imported to add visual context to a calculation, such as a diagram that helps explain a problem. The combination of formulas and images makes the page useful for presenting as well as solving mathematical tasks.

Red Crab suits users who prefer a visual workspace for scientific and technical calculations, especially when equations contain more than basic arithmetic. It can be used to explore formulas, document a sequence of calculations, or keep related equations together in a saved worksheet. Its editor-based approach is also helpful when the notation itself matters and should remain legible while results are checked.

The program is freeware and requires Microsoft .NET Framework 4.0 or later. It is available for Windows, including Windows 7, and its worksheet interface provides an alternative to entering every calculation into a single-line calculator field.

Framework 4.0 or higher

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