Planned — not yet available Castiel for
Castiel for
the web.
A browser version of Castiel is planned, starting with Simple and School modes. It is not available yet — the desktop and mobile apps already have every mode.
C
Castiel for the web
Coming later
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Simple
The everyday four-function calculator — memory keys, a running grand total, and a docked tape. Free to use, with no time limit.
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School
A full scientific calculator for study — natural textbook entry, graphing, 3D surfaces, statistics, equations, and a spreadsheet — following the conventions of graphing calculators like the Casio fx-CG100. Free, with no time limit.
In the meantime, the desktop and mobile apps already have every mode. Get Castiel →