Wordkeep: Daily English Words

Wordkeep gives you a few English words a day — the ones just past what you already know. It starts by finding your level. A ninety-second test shows you words and asks which you know. Salted through it are words that do not exist. Nobody can know those, so what you claim about them measures how much you are guessing, and that gets subtracted out. The result is an estimate of how many words you know, and a starting level that is honest rather than flattering. After that, the words you see sit one band above your own. Not words you already know. Not words years out of reach. WHAT A DAY LOOKS LIKE Three, five or ten words — you choose. Swipe up through them like a feed. Tap to hear a word read aloud. Pull up the examples to see it used in real sentences. Mark it known and it never comes back; save it and it waits in your list. A widget on your Home screen shows the day's word without…