ChattyInfty Ver.3 series is an authoring tool of Multimedia Daisy and accessible EPUB3.

Download: (about 113MB) --- July. 31, 2023
Trial use: Freely usable for 30 days in total.
Users of the screen reader "JAWS"are reccomended to read "For-JAWS-Users.txt" before using ChattyInfty.

Main features
  • ChattyInfty3 is developed in the base of ChattyInfty2 below.
  • Adding to the main functions of ChattyInfty2, it has the following new features.
  • It has an easy and intuitive userinterface to edit the headding structure of documents (Chapters, sections, subsections),
  • Edited results can be saved as
    • DAISY2.02 with voice in SAPI5, math expressions in image
    • DAISY3 (Text Daisy) with math expressions in MathML
    • EPUB3 with voice in SAPI5, math expressions in image / MathML
  • Users can control the reading of the texts and math expressions in different ways in case neccessary.
  • Muliple language support:
    supported languages

For mor details, please read the Manual of ChattyInfty3.


ChattyInfty Ver.2 series is an authoring tool of math documents for the blind.

Download: (about 16MB) --- May 28, 2021
Trial use: Freely usable for 30 days in total.
Users of the screen reader "JAWS"are reccomended to read "For-JAWS-Users.txt" before using ChattyInfty.

Main features
  • ChattyInfty is an editor of math documents with voice output, usable by visually impaired people. Math expressions can easily be input and edited using only keyboard, with simultaneous speech output of symbols and math structure with key operations.   
  • The edited results can be saved as LaTeX source, XHTML with MathML, MS Word XML, etc.  
  • The default file format of ChattyInfty is identical with that of InftyEditor.(iml)

ChattyInfty is a mathematical document editor for visually disabled people to read and write scientific documents. It is developed by adding a speech output interface to "InftyEditor", using Microsoft speech API.

Math expressions from secondary education level math to university level math expressions or more high-level math used by mathematicians or scientists to write scientific papers can be read and written by using ChattyInfty. For more details, please read ChattyInfty2_Eng_Manual.doc.

Documents edited by ChattyInfty can be output into various file formats, such as LaTeX, PDF, MathML, HTML and MS Word XML.
To compile the converted LaTeX file and to get PDF file in ChattyInfty, your PC should have a recent compiler of TeX installed together with several related software. You can download a fully automatic installer kit of LaTeX package with related software usable in ChattyInfty from:

> The LaTeX software page of InftyProject.

Speech API

To use ChattyInfty, Microsoft speech API version 5 (SAPI5) should be installed in your PC..

Microsoft Speech API, Ver. 5 may be already installed in your PC if you are a user of popular screen readers.
If not, please read: OneCoreVoiceToSapi5.pdf or OneCoreVoiceToSapi5.docx

* Purchase

Standard license : 200USD
One Year license : 40USD

The license is valid for both ChattyInfty2 and ChattyInfty3.

You can get a serial number immediately after the payment on the purchase site above, and you can use it to activate ChattyInfty on your PC to start using ChattyInfty.

3. Environment.

ChattyInfty is usable on Windows 10 and 11 (64bit / 32bit).

4. Contact.

If you have any question about ChattyInfty, please contact:

NPO Science Accessibility Net Office
E-mail: office[at] (please replace "[at]" by the at-mark.)