From version 2.2.4 Extra Keys Pro is freeware! – exactly like the standard Extra Keys tool for entering accents and other characters.  It was previously only available on payment of a small fee but with this new version the licence code authentication has been completely removed.

So now the choice between standard Extra Keys and Extra Keys Pro is entirely down to the user’s preference.  The Pro edition has more capability, with the options of sending characters in various encoded formats but therefore has more settings that may be unnecessary for many people.  It also requires an additional configuration file for these settings, though this is created automatically when needed. Both programs remain very lightweight, fully portable and have no special system requirements.