Apertium is described as 'rule-based machine translation platform. It is free software and released under the terms of the GNU General Public License' and is an app in the Education & Reference category. There are more than 25 alternatives to Apertium for a variety of platforms, including the Web, Windows, Mac, Android and iPhone. The best alternative is Google Translate, which is free. Other great apps like Apertium are DeepL Translator (Freemium), Crowdin (Paid), Tatoeba (Free, Open Source) and Linguee (Free).