1800 Grammar Tests is a free Android app developed by Autoinet that offers 1925 English grammar questions. Each test contains 10 questions to help users test their knowledge of English grammar. The app provides two modes of testing: auto-score mode, which marks the correct answer automatically, and test mode, which gives users the answers after they finish all ten questions.

With this app, users can learn English grammar on their Android devices and test their knowledge in offline mode as well. The app also provides random questions in quiz mode, ensuring that users do not face any repeated questions. The app is a great tool for anyone looking to improve their understanding of the English language and take their grammar skills to a new level.

Please note that the app is no longer supported, but a new version in English 3in1 is available on the Google Play Store.