Mostly very good!
I appreciate the sections and it reminds you to review with progressively bigger gaps of time, but some modules are impossible to pass due to some sort of error. Even with the right answer, it returns a mistake and also makes half the sentence invisible. I have only had this happen once but it does put a damper on an otherwise useful app.
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Response from developer
Thank you for your detailed feedback! We’ve just released an update with several improvements. Please try the latest version, and if you have any further suggestions, it would be a great help if you could let us know. レビューありがとうございます。
