英文の9割が読めるようになる単語帳アプリ NGSL-Wordbook

There is a word list called NGSL (New General Service List) that contains frequently used English words that make up about 90% of general English texts.
I created NGSL-Wordbook to efficiently advance English vocabulary learning.
It is PWA-compatible, so if you install it on your device, you can study English vocabulary even in situations without internet access, such as on an airplane.