Do I need to buy Polylang PRO?

You can use Gato AI Translations for Polylang with both the free version and the PRO version of Polylang.

You need to buy Polylang PRO, if you need any of the following features:

• URL modifications: Setting the language from content, or from different domains.
• Share slugs: Keeping the same slug for translations (for posts and taxonomies).

Otherwise, the free version of Polylang will be enough.