GeoGebra Scientific Calculator compared with Casio fx-991 and Texas Instruments TI-30| GeoGebra科学計算機 | Casio fx-991 family (typical, fx-991EX checked) | Texas Instruments TI-30 family (typical, TI-30XS MultiView checked) |
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| Form factor and cost: GeoGebra Scientific runs in a web browser and is described as a free online scientific calculator. An iOS app exists for iPhone and iPad, and its developer states there is no Mac or Windows version of that app. | Form factor and cost: Typically a handheld device with solar and battery power. The fx-991EX page lists solar plus battery with an approximate main battery life of 2 years and auto power off. Purchase price is not given on that page. | Form factor and cost: Typically a handheld device. The TI-30XS MultiView page lists dual solar and battery power and gives no price, referring buyers to a Where to Buy link. |
| Functions and statistics: The keypad offers trigonometric functions and inverses, ln, log10, nth root, nPr, nCr, factorial, mean, stdev and stdevp, and variables a to z. Fractions and exponential functions are also covered. | Functions and statistics: Typically broad. The fx-991EX lists 552 built-in functions, matrix (up to 4x4) and vector calculations, equation solving with 2 to 4 unknowns, polynomial equations up to quartic, and normal, binomial and Poisson distributions. | Functions and statistics: Typically narrower than the Casio class. The TI-30XS MultiView offers fraction math, scientific notation, trigonometry, logarithms, combinations and permutations, a function table and three basic lists, with one- and two-variable statistics. |
| データ処理: The page documents statistical keys for mean, stdev and stdevp. No list editor or spreadsheet function is confirmed on that page. | データ処理: Typically includes a list-based data editor. The fx-991EX adds a spreadsheet of up to 5 columns by 45 rows, holding a maximum of 170 data items. | データ処理: Typically includes a basic list editor. The TI-30XS MultiView has three lists, which suits small data sets for statistics. |
| Display: Output depends on the screen of the device used. The keypad is on screen and the interface is a web page or an app. | Display: Typically a natural textbook display. The fx-991EX uses a high-resolution LCD with 10+2 digits and an icon menu. | Display: Typically a multi-line LCD. The TI-30XS MultiView has a four-line by 16-character screen with MathPrint formatting for textbook-style expressions and fractions. |
| Exams and status: The App Store listing describes an exam mode that turns a phone or tablet into a handheld calculator for tests. Acceptance depends on the exam board, so check its rules before use. | Exams and status: Casio lists the fx-991EX as permitted for GCSE, AS and A Level exams. The same page states that this model has been discontinued and recommends the fx-991CW ClassWiz as replacement. | Exams and status: The TI-30XS MultiView is listed as approved for the SAT, ACT and AP exams. |
