NWL words of any length are checked against the real, official NASPA Word List (NWL2023), licensed directly from NASPA. SOWPODS 2–3 letter words are checked exactly against this app's compiled list; SOWPODS 4+ letter words are checked against ENABLE, a public-domain word-game dictionary — a close but not byte-identical match to the real Collins/SOWPODS list (we don't have a Collins license yet).
Shows every valid 2 and 3-letter word that can be made from the letters you enter (using each letter at most as many times as you typed it).
A running local record of every word you've ever gotten wrong. Valid words on the left, invalid on the right, bar length shows how often you've missed each. Stored on this device only.