Nativish is an advanced AI-tool designed to assist users in writing fluently in a second language. Its primary function is to make instant AI text enhancements to ensure the users' writings are confident and have a native-level quality.

The tool is not exclusive to any proficiency level, being suitable for beginners in a language as well as for advanced learners and expats. It is utilized by users who need help in efficient communication in a foreign language, or who are immersing in a new language and would benefit from an assistive tool for writing.

Nativish aids its users by improving the understanding and usage of their chosen language while providing a confidence boost in their written communication skills.

By offering real-time feedback and improvements, Nativish aims to speed up the language acquisition process and encourage continuous learning in its users.

The exact languages supported by this tool are currently unspecified but it is promoted as a tool for 'any language.' Nativish follows a freemium model, providing some services for free while offering a paid version for more extensive features.

Its complete pricing structure and specific feature set are not mentioned in the provided text.