Vade Mecum Shelf

Collection of utilities wrapped into one single app.

Lists of color names, with live search
Customizable clock, using language-sensitive text formatting for date and time
LaTeX math expression renderer, using the KaTeX JavaScript library
Converters between roman and arabic numerals
Detailed list of system information, by category
Category Utilities
Keywords collection modular shelf utility vade mecum
License MIT
Latest Release 1.2.0 (v1.2.0)
Release Notes
  • Added two new utilities:
    • ISO Language Codes: full list of ISO 639-1 language codes, with live search.
    • Text Scratchpad: scratchpad to store persistent text data.
  • Renamed categories.

Vade Mecum Shelf icon VADE MECUM SHELF

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

It 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 can be toggled on and off from the View menu, as well as the use of categories.

  • 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 Titles 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:

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

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


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

Jabberwocky 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:

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

System Information 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

Unicode Inspector

Code point information of Unicode characters:

Unicode Inspector 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 Titles 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.

  • When using the Developer Tools, be careful not to modify the zoom level; this will almost certainly crash the app. This is a documented bug which may be fixed soon, hopefully...


  • 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.