AllChars is described as 'Provides a quick, easy-to-remember way of creating accents like é Ü ç î æ and special characters like ƒ ² ‰ © £ ± ß ° 1/2 ¿ « » „ in most Windows programs' and is an app in the office & productivity category. There are more than 10 alternatives to AllChars for a variety of platforms, including Windows, Mac, Web-based, iPhone and BSD apps. The best AllChars alternative is WinCompose, which is both free and Open Source. Other great apps like AllChars are Character Map, UnicodePad, Character Map UWP and Codepoint.
Both are used for quick input of special characters.