Vade Mecum Shelf

Collection of utilities wrapped into one single app.

Vade Mecum Shelf icon VADE MECUM SHELF

Vade Mecum Shelf is a collection of utilities wrapped into one single app, built with Electron.

This app works on Mac OS X, Linux and Windows operating systems.

Its look and feel is partly inspired by the brilliant Electron API Demos app, but it makes use of a more dynamic modular approach: each utility is made of an independent, self-contained folder including all necessary files.


  • The app window is resizable; its title displays the currently selected utility name next to the app name.

  • The visibility of the navigation sidebar, as well as the use of categories, can be toggled on and off from the View menu.

  • It is possible to quickly scroll to the top or to the bottom of the utility from the View menu.

  • A utility can be displayed either by clicking its name in the navigation sidebar, or by selecting its name from the Utilities menu.

  • From the Developer menu, it is possible to reveal the app's executable file, and also to open the user data directory (where the persistent settings get stored), as well as the temporary items directory.


The following utilities are currently available:

Chemical Elements

Full list of chemical elements, with live search:

Chemical Elements screenshot

Chinese Zodiac

Full list of the twelve Chinese zodiac signs, with live search:

Chinese Zodiac screenshot

CIDR Calculator

Simple CIDR calculators:

  • CIDR to IP Range
  • IP Range to CIDR List

CIDR Calculator screenshot

Color Names

Lists of color names, with live search:

  • W3C Color Names
  • X11 Color Names
  • Mac OS X Crayons

Color Names screenshot

Departments of France

Full list of French departments, with live search:

Departments of France screenshot

Digital Clock

Customizable clock, using language-sensitive text formatting for date and time:

Digital Clock screenshot

HTTP Status Codes

Full list of HTTP status codes, with definitions in several languages:

  • English
  • French
  • Japanese

HTTP Status Codes screenshot

IETF Language Tags

References for IETF BCP 47 language tags and subtags:

IETF Language Tags screenshot

ISO Country Codes

Full list of ISO 3166-1 country codes, with live search:

ISO Country Codes screenshot

ISO Language Codes

Full list of ISO 639-1 language codes, with live search:

ISO Language Codes screenshot

ISO Script Codes

Full list of ISO 15924 script codes, with live search:

ISO Script Codes screenshot


Typographic rendition of Lewis Carroll's nonsense poem "Jabberwocky":

Jabberwocky screenshot

JavaScript Runner

JavaScript code runner, useful for quick testing/prototyping or data processing:

JavaScript Runner screenshot

JSON Formatter

JSON data formatter and validator:

JSON Formatter screenshot

LaTeX Math Renderer

LaTeX math expression renderer, using the KaTeX JavaScript library:

LaTeX Math Renderer screenshot

List of U.S. States

Full list of states and territories of the United States, with live search:

List of U.S. States screenshot

Prefectures of Japan

Full list of prefectures of Japan, with live search:

Prefectures of Japan screenshot

Roman Numerals

Converters between roman and arabic numerals:

  • Roman to Arabic Numeral
  • Arabic to Roman Numeral

Roman Numerals screenshot

System Information

Detailed list of system information, by category:

  • Framework
  • Main Process
  • Renderer Process
  • Application
  • Navigator
  • Operating System
  • OS User Info
  • Screen
  • Window
  • Environment

System Information screenshot

Technical Definitions

Lists of technical definitions:

  • Computing Abbreviations
  • Mac OS Release Names
  • Metric Prefixes | Fractions
  • Metric Prefixes | Multiples
  • IEC Binary Prefixes | Multiples
  • Name of a Polynomial by Degree

Technical Definitions screenshot

Text Converter

Encode and decode text according to several string formats:

  • JSON String
  • Base64 String
  • Hexadecimal String

Text Converter - Text Encoder screenshot

Text Converter - Text Decoder screenshot

Text Scratchpad

Scratchpad to store persistent text data:

Text Scratchpad screenshot

Trigonometric Formulas

Sets of trigonometric formulas, by category:

  • Basic Definitions
  • Symmetry Identities
  • Cofunction Identities
  • Pythagorean Identities
  • Sum to Product
  • Product to Sum
  • Squares
  • Half Angle
  • Sum of Angles
  • Double Angle

Trigonometric Formulas screenshot


You'll need Node.js installed on your computer in order to build this app.

git clone
cd vade-mecum-shelf
npm install
npm start

If you don't wish to clone, you can download the source code.

Several scripts are also defined in the package.json file to build OS-specific bundles of the app, using the simple yet powerful Electron Packager Node module.
For instance, running the following command will create a Vade Mecum version for Mac OS X:

npm run build-darwin


You can download the latest release for Mac OS X.

Known Issues

  • In Linux (at least on Linux Mint 18.2 Sonya and Ubuntu 16.04.3 LTS), there is a bug which prevents the window position to be correctly recorded between consecutive runs, a slight shift to the bottom right occurs systematically.

  • In Ubuntu 16.04.3 LTS, the Utilities menu is never updated whenever one of its items is selected, or when the selection is triggered programmatically. This bug affects all menus made of radio-buttons items.


  • The Undo/Redo stack is common to all text editing elements of the app, including those which are hidden. This behavior is a known shortcoming and cannot be changed or improved for the time being.

  • Although this app has been developed from the start with multiple platforms in mind, it has only been successfully tested on Mac OS X (Yosemite 10.10.5 and El Capitan 10.11.6), and on two Linux flavors, Linux Mint 18.2 Sonya and Ubuntu 16.04.3 LTS, installed into VirtualBox.


The MIT License (MIT).

Copyright © 2017-2018 Michel MARIANI.


Something missing? Edit this app.

Keyboard Shortcuts

Key Action
/ Focus the search bar
Esc Focus the search bar and cleans it
Select the next search result
Select the previous search result
Enter Open the selected search result
cmdEnter Ctrl+Enter Open the selected search result in a new tab