What are some alternatives?
When comparing Transifex and POEditor, you can also consider the following products
Crowdin - Localize your product in a seamless way
Smartling - Website localization & translation
Poedit - Poedit translations editor. The best way to translate apps and sites.
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
Weblate - Weblate is a free web-based translation management system.
OneSky - Full Stack Localization Solution