the professional unit converter • Free Software • > 6000 units • for Linux, macOS and Windows


The Application

Please make sure that your computer meets the system requirements. Select the file according to your operating system and your install preference. On Windows download the .exe, on GNU/Linux you could install the app using the standard packaging systems that are available on those platforms. Select the .zip or .tar.bz2 files if you prefer a portable app which does not require an installation. After the download, I recommend to read the installation instructions. Checksums for all binaries are available here.

Operating system Filename /
Installation instructions
Filesize in MB
WindowsMicrosoft Windows
(includes the 64 bit OpenJDK 11.0.6 and all computer generated sound files)
Installation instructions
Mac OS XMac OS 10.11 to macOS 10.15
(includes the 64 bit OpenJDK 11.0.6 and all computer generated sound files)
Installation instructions
LinuxGNU/Linux and Unix
(for systems with Debian package management)
Installation instructions
LinuxGNU/Linux and Unix
(for systems with rpm package management)
Installation instructions
LinuxGNU/Linux and Unix
(self extracting file)
Installation instructions
LinuxGNU/Linux und Unix
(for users who want to extract manually, no root permissions required)
Installation instructions
PortablePortable for all desktop operating systems
(JRE will be used from the system)
Installation instructions
PortableNC 2.1 - Portable for all desktop operating systems [experimental]
(JRE 8u152 for Windows 32 and 64 bit, GNU/Linux 32 and 64 bit, OS X 64 bit, Solaris 64 bit and suitable launchers for each operating system are bundled in this fat package)
Installation instructions

In order to verify the MD5 or SHA-1 digest, we recommend to use the free program called Jacksum.
Older versions of the NumericalChameleon are listed here

Plug-ins (optional)

In order to install a plug-in, simply copy the jar file(s) that are included in the .zip file to the NumericalChameleon's folder called "lib" and restart the NumericalChameleon.

Plug-in Filename Filesize in MB
Plug-inSound files for both categories "Spoken Numbers" and "Time in Words". Computer generated male voice by espeak 1.47.03.

Supported languages: more than 20 (German, English, Esperanto, French, Finnish, Italian, Latin, Dutch, Polish, Portugese, Swedish, Romanian, Spanisch, Turkish, Hungarian, etc.)

If you use this Plug-in, the human voice for German will be overwritten. 16.3
Plug-inSound files the category "Spoken Numbers". Female voice, recorded by a real human - sounds great!

Supported language: German

If you use this Plug-in, the computer generated void for German will be overwritten. 16.0

The Source Code (optional)

Source Code for Developers Filename Filesize in MB
The source code of the NumericalChameleon is released under the conditions of the GNU General Public License
It has been published on github on the repository
v3.0.0.tar.gz 1.0





The Team

The founder of this project is Johann N. Löfflmann from Germany. Since 2001 he has been working with talented people all around the world in order to improve the NumericalChameleon, and learning new areas of knowledge. The list of contributors can always be found in the latest download package and in the copyright section.

GPL v3
OSI certified
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