Casyopee - Downloads
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What they say:   I used Casyopée to help students solve optimisation problems. It allowed me to present students very open tasks. Students explored and found results that they had to prove afterward. Casyopée also helped students reuse basic strategies for solving.   A teacher
What they say:   Casyopée is faster and more convenient than a calculator.... We have the geometric and algebraic side of the problem at the same time. It is easier to see how a function "reacts." It's useful and interesting.   A student
What they say:   Casyopée makes it easy to calculate a derivative, to factor, to calculate zeros... and have a graph of the function next to it in the same window. It allows on a geometric problem to be able to establish variables that can then be used to study the problem by way of functions...   A student
What they say:   Casyopee is a powerful application that can prove useful to both students and teachers It allows you to use various exploration and modeling tools, with the purpose of studying or teaching mathematical functions.   Softpedia
What they say:   Casyopee comes with lots of features. One of these features is the help provided for proving a function. There is also a feature for writing HTML reports that include the mathematical functions. Casyopee is guaranteed to improve the mathematical knowledge of its users.
What they say:   Besides the concept of number, the concept of function is the most important one in mathematics      David Hilbert
What they say:   The notion of function is present in all scientific disciplines, and also in everyday life. Our experience as a teacher shows every day that it is a problem for many students. Situations with Casyopée can also be used outside of a technological environment and everyone will be able to reflect on her professional practice.   A university teacher

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Unfold Close  1. Software

  Version 3 stable

To avoid problem of administrator rights, this version can be downloaded as a ZIP file (20 Mo)

To use the ZIP file, please extract the Casyopee directory into an allowed directory and run casyopee.exe.
It should run directly in English, and you can choose your language via  the Options Langue .menu.

Note that if the NotePad does not display correctly because of a restriction on the temporary directory, you can change it via the

You can also use this version from an USB key.

Important: if using for the first time, please read the "Casyopee Getting started manual" (documentation downloads) or the online help ( also a menu entry on the website).

Looking at videos demonstrating Casyopée on Olivier Leguay's very exciting blog is also quite usefulée

In case of problem when using with XP please see here

In case characters display  uncorrectly, please modify by

Configuration Panel

Regional and linguistic Options 


Language  for non unicode software
 please select Français (France)

For using with Macintosh OS,  you need a windows emulation .

For using with Linux, please use Wine, see here

Version 3.5.1 Correction bug on intersection. New Splash Screen.

Version 3.5.0 Numerous internal improvements, including redesign of the numeric evaluator and improvement of precision in the GD. Files prior to     version 3.3.0 are no longer loaded. Use version 3.4.6 for download on the site.

Version 3.4.9 Fix on fonc algo

Version 3.4.8 Environnement "sequences". User guide  (sorry French only)

Version 3.4.7 Numerical Evaluation enhanced. Approximate values' ​significant digits in the in the option menu. Points' labels move with the mouse. Variables declared in the algorithms are considered local.

Version 3.4.6 Corrections (modelling) 

Version 3.4.5 

Adaptation for Linux. Bug on geometrical calculations and formulas whose length exceeds 1024.

Version 3.4.4

Switch Radians/Degré. See here. Bugs on reported points.

Version 3.4.2

correction bugs (intersections, area between curve and line)

Version 3.4.1

correction bugs (modelling, comments in programs)

Version 3.4.0

Enhancement and localisation of the programming environment (function defined by an algorithm) after experimenting.

Option: Creation of functions with values in R² (parametric curves)

See documentation and examples of use in the on line Help

Version 3.3.6

finalisation of the programming environment (function defined by an algorithm)

To do: localisation and English documentation.

Bugs corrected in version 3.3.4:

1. loading functions with exponentials in .CAS files

2. saving and loading values of the variables in .CAS files

Bugs corrected in version 3.3.3:

1. parameters created automaticly

2. wheel in the graphic window

3. redefinition of points

Bugs corrected in version 3.3.2:

  about expressions (updating and saving)

Bugs corrected in version 3.3.1:

1. modification of properties of parameters: Casyopée issues a warning, most of the time irrelevant, when the parameter is used in the fomula of a function. In this case please simply ignore and confirm.

2. problem of display of geometrical loci. 385.12 Kb) Downloaded 5431 times Download Hyperlink   Preview  Print... 

Since version 3.3.7, Casyopée does not load anymore the  files .CAS prior to version 3.3.0.
This version 3.3.6 is able to load these files and to save them in the new format.
Please unzip the folder V_3_4_6 in a Casyopee3 folder, and run  Casyop346.exe in this folder. 857.06 Kb) Downloaded 2659 times Download Hyperlink   Preview  Print... 

Casyopée Upgrade latest version.

Automatic update works from version 3.2.6.

This is the "by hand" procedure for previous version 3.

Download the file maj.exe into the /casyopee3 directory (where casyopee.exe is).
If you want to keep the existing version, rename casyopee.exe into casyopee_old.exe.

run maj.exe

In case you did not rename casyopee.exe, you will be prompted to confirm replacement.

In case you do not want to keep the previous version, you can erase the directory V_3_y_x  

Run casyopee.exe as usual.

maj.exe(1 575.68 Kb) Downloaded 4679 times Download Hyperlink   Preview  Print... 

Unfold Close  2. Documentation

Download Manual in English HERE

Warning: this manual corresponds to 3.1 version 3.1 delivered in 2013. Since then, new features have been added, some functions have been reviewed (including the settings) and the choice has been made to develop an online documentation (menu "Software" of this site). The manual remains a good entry into Casyopée use. Itcan be supplemented by the online documentation as you become used.

The history of the versions here.

El manual en español aquí

65 pages 

GettingStartedManualV3.pdf(2 342.93 Kb) Downloaded 4474 times Download Hyperlink   Preview  Print... 

 For this manual, our choice has been to introduce the user by offering several situations with a step‐by step guidance. It will be complemented by an online reference manual specifying the capabilities and options.

The preliminary activity is about mathematics expressions in Casyopée. 

The first three sections introduce to the notion of function in Casyopée.

The next sections detail the Casyopée’s capabilities in dynamic geometry especially to model dynamic dependencies.

Another  section illustrates how a curve of a function defined symbolically can be handled as a geometrical object and the case of parametric curves.

Finally, the manual presents geometrical locus.

65 pages

GettingStartedManualV3.pdf(2 342.93 Kb) Downloaded 2200 times Download Hyperlink   Preview  Print... 

ModeEmploiCasyop.pdf(0.00 Kb) Downloaded 2170 times Download Hyperlink   Preview  Print... 

PresCasyopV3En.pdf(665.08 Kb) Downloaded 1966 times Download Hyperlink   Preview  Print... 

Unfold Close  3. Films presenting classroom situations (in French)

distance_point_parabole.wmv(56 920.79 Kb) Downloaded 2272 times Download Hyperlink   Preview  Print... 

soustangente.flv(16 789.08 Kb) Downloaded 2123 times Download Hyperlink   Preview  Print... 

PresSigneProdAffine.wmv(73 443.51 Kb) Downloaded 2685 times Download Hyperlink   Preview  Print...