"間違えると恥ずかしい日本語慣用句" is a free Android app developed by Flipout LLC. It falls under the Education & Reference category and aims to help users understand the meanings, usage, and correct reading of Japanese idioms.

The app includes a wide range of challenging questions that focus on commonly mistaken or embarrassing idiomatic expressions. By using this app, users can improve their understanding and usage of Japanese idioms, ensuring they don't make embarrassing mistakes in their conversations.

"間違えると恥ずかしい日本語慣用句" is completely free to use, offering all its features and questions without any cost. The accuracy of the answers within the app is based on the "National Opinion Survey on the Japanese Language" conducted by the Agency for Cultural Affairs.

If you encounter any issues while using the app, you can easily report them by accessing the "Contact Us" feature within the app.